Hydraulic fluid power - Determination of pressure ripple levels generated in systems and components - Part 1: Method for determining source flow ripple and source impedance of pumps

This part of ISO 10767 establishes a test procedure for measuring the source flow ripple and source
impedance of positive-displacement hydraulic pumps. It is applicable to all types of positivedisplacement
pumps operating under steady-state conditions, irrespective of size, provided that the
pumping frequency is in the range from 50 Hz to 400Hz.
Source flow ripple causes fluid borne vibration (pressure ripple) and then airborne noise from
hydraulic systems. This procedure covers a frequency range and pressure range that have been found
to cause many circuits to emit airborne noise which presents a major difficulty in design of hydraulic
fluid power systems. Once the source flow ripple and source impedance of hydraulic fluid power pump
are known, the pressure ripple generated by the pump in the fluid power system can be calculated by
computer simulation using the known ripple propagation characteristics of the system components.
As such, this part of ISO 10767 allows the design of low noise fluid power systems to be realized by
establishing a uniform procedure for measuring and reporting the source flow ripple and the source
impedance characteristics of hydraulic fluid power pumps.
In this part of ISO 10767, calculation is made for blocked acoustic pressure ripple as an example of the
pressure ripple. An explanation of the methodology and theoretical basis for this test procedure is given
in Annex B. The test procedure is referred to here as the two pressures/two systems method. Ratings are
obtained as follows:
a) source flow ripple (in the standard “Norton” model) amplitude, in cubic meter per second[m3/s],
and phase, in degree, over 10 individual harmonics of pumping frequency;
b) source flow ripple (in the modified model) amplitude, in cubic meter per second [m3/s], and phase,
in degree, over 10 individual harmonics of pumping frequency; and its time history wave form,
c) source impedance amplitude, in Newton second per meter to the power of five [(Ns)/m5]., and
phase, in degree, over 10 individual harmonics of pumping frequency;
d) blocked acoustic pressure ripple, in MPa (1 MPa = 106 Pa) or in bar (1 bar = 105 Pa), over 10 individual
harmonics of pumping frequency; and the RMS average of the pressure ripple harmonic f1 to f10.

Transmissions hydrauliques - Détermination des niveaux d'onde de pression engendrés dans les circuits et composants - Partie 1: Méthode de détermination de l'onde de flux de la source et de l'impédance de la source des pompes

L'ISO 10767-1-1:2015 �tablit un mode op�ratoire d'essai pour le mesurage de l'onde d'�coulement de la source et de l'imp�dance de la source des pompes hydrauliques volum�triques. Elle s'applique � tous les types de pompes volum�triques fonctionnant dans des conditions de r�gime permanent, quelle que soit leur taille, � condition que la fr�quence de pompage soit comprise entre 50 Hz et 400 Hz.

Fluidna tehnika - Hidravlika - Ugotavljanje tlačnih konic pri nihanju tlaka v sistemih in sestavinah - 1. del: Metoda za določevanje vira valovanja toka in impedance črpalk

Ta del standarda ISO 10767 določa preskusni postopek za merjenje vira valovanja toka in impedance hidravličnih črpalk z iztiskanjem. Uporablja se za vse vrste črpalk
z iztiskanjem, ki delujejo pri ustaljenih pogojih, ne glede na velikost, pod pogojem, da je frekvenca črpanja v obsegu od 50 Hz do 400 Hz.
Vir valovanja toka povzroča tresljaje v tekočini (tlačno valovanje) in posledično emisije hrupa hidravličnih sistemov. Ta postopek vključuje frekvenčni in tlačni razpon, ki dokazano povzročata emisije hrupa številnih krogotokov, kar predstavlja večjo težavo pri načrtovanju hidravličnih pogonskih sistemov. Ko sta vir valovanja toka in impedanca vira hidravlične pogonske črpalke znana, je z računalniško simulacijo in znanimi lastnostmi širjenja valovanja v sistemskih komponentah mogoče izračunati tlačno valovanje, ki ga ustvari črpalka v fluidnem pogonskem sistemu. Ta del standarda ISO 10767 kot tak omogoča načrtovanje tišjih fluidnih pogonskih sistemov z vzpostavitvijo enotnega postopka za merjenje in sporočanje lastnosti vira valovanja toka ter impedance vira hidravličnih pogonskih črpalk.
V tem delu standarda ISO 10767 se izračun opravi za blokirano valovanje zvočnega tlaka kot primer tlačnega valovanja. Razlaga metodologije in teoretične osnove za ta preskusni postopek je podana v dodatku B. Preskusni postopek se na tem mestu obravnava kot metoda z dvema tlakoma/sistemoma. Nazivne vrednosti so pridobljene, kot sledi:
a) amplituda vira valovanja toka (v standardnem »Nortonovem« modelu) v kubičnih metrih na sekundo (m3/s) in faza v stopnjah prek 10 ločenih harmonikov frekvence črpanja;
a) amplituda vira valovanja toka (v spremenjenem modelu) v kubičnih metrih na sekundo (m3/s) in faza v stopnjah prek 10 ločenih harmonikov frekvence črpanja ter valovna oblika v časovnem poteku;
c) amplituda impedance vira v newton-sekundah na meter na peto potenco ((Ns)/m5) in faza v stopnjah prek 10 ločenih harmonikov frekvence črpanja;
d) blokirano valovanje zvočnega tlaka v MPa (1 MPa = 106 Pa) ali v barih (1 bar = 105 Pa) prek 10 ločenih harmonikov frekvence črpanja in povprečje efektivne vrednosti harmonikov tlačnega valovanja od f1 do f10.

General Information

Status
Published
Publication Date
28-Mar-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Mar-2016
Due Date
26-May-2016
Completion Date
29-Mar-2016

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INTERNATIONAL ISO
STANDARD 10767-1
Second edition
2015-10-01
Hydraulic fluid power —
Determination of pressure ripple
levels generated in systems and
components —
Part 1:
Method for determining source flow
ripple and source impedance of pumps
Transmissions hydrauliques — Détermination des niveaux d’onde de
pression engendrés dans les circuits et composants —
Partie 1: Méthode de détermination de l’onde de flux de la source et
de l’impédance de la source des pompes
Reference number
ISO 10767-1:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 10767-1:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 10767-1:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Instrumentation .................................................................................................................................................................................................... 3

4.1 Static measurements.......................................................................................................................................................................... 3

4.2 Dynamic measurements ................................................................................................................................................................. 4

4.3 Frequency analysis of pressure ripple ................................................................................................................................ 4

5 Pump installation ................................................................................................................................................................................................ 4

5.1 General ........................................................................................................................................................................................................... 4

5.2 Drive vibration ........................................................................................................................................................................................ 5

5.3 Reference signal ..................................................................................................................................................................................... 5

6 Test conditions and setting ........................................................................................................................................................................ 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Mean flow .................................................................................................................................................................................................... 5

6.3 Mean discharge pressure ............................................................................................................................................................... 5

6.4 Pump shaft speed.................................................................................................................................................................................. 5

6.5 Fluid temperature ................................................................................................................................................................................ 5

6.6 Fluid property .......................................................................................................................................................................................... 6

7 Test rig ............................................................................................................................................................................................................................. 6

7.1 General ........................................................................................................................................................................................................... 6

7.2 Test pump .................................................................................................................................................................................................... 6

7.3 Test fluid ....................................................................................................................................................................................................... 6

7.4 Inlet line ........................................................................................................................................................................................................ 6

7.5 Inlet pressure gauge (for static pressure) ....................................................................................................................... 6

7.6 Pump discharge line ........................................................................................................................................................................... 7

7.6.1 General...................................................................................................................................................................................... 7

7.6.2 Pump discharge port connection ....................................................................................................................... 8

7.6.3 Reference pipe ................................................................................................................................................................... 8

7.6.4 Connecting pipe ................................................................................................................................................................ 8

7.6.5 Extension pipe ................................................................................................................................................................... 9

7.7 Pressure transducer ........................................................................................................................................................................... 9

7.7.1 Dynamic pressure transducer .............................................................................................................................. 9

7.7.2 Static pressure transducer ...................................................................................................................................... 9

7.8 Loading valve ............................................................................................................................................................................................ 9

7.9 Back pressure valve ............................................................................................................................................................................ 9

7.10 Safety valve ................................................................................................................................................................................................. 9

8 Test procedure .....................................................................................................................................................................................................10

8.1 General ........................................................................................................................................................................................................10

8.2 Frequency analyses of pressure ripple............................................................................................................................11

8.3 Evaluation of source flow ripple, Q , in the standard “Norton” model.................................................11

8.4 Evaluation of source impedance, Z , in the standard “Norton” model .................................................12

8.5 Evaluation of source flow ripple, Q *, in the modified model ......................................................................12

8.6 Evaluation of blocked acoustic pressure ripple rating ......................................................................................13

9 Test report ................................................................................................................................................................................................................13

9.1 General information and test conditions .......................................................................................................................13

9.2 Test results...............................................................................................................................................................................................13

10 Identification statement (Reference to this part of ISO 10767) .......................................................................14

Annex A (normative) Test forms ............................................................................................................................................................................15

© ISO 2015 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 10767-1:2015(E)

Annex B (informative) Two pressures/two systems method .....................................................................................................21

Bibliography .............................................................................................................................................................................................................................28

iv © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 10767-1:2015(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 8,

Product testing.

This second edition cancels and replaces the first edition (ISO 10767-1:1996), which has been

technically revised.

ISO 10767 consists of the following parts, under the general title Hydraulic fluid power — Determination

of pressure ripple levels generated in systems and components:
— Part 1: Precision method for pumps
— Part 2: Simplified method for pumps
— Part 3: Method for motors
© ISO 2015 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 10767-1:2015(E)
Introduction

The first edition of ISO 10767-1, published in 1996, was developed with a view to provide means for

measurement (experimental determination) of the set of two characteristic values consisting of source

flow ripple Q and source impedance Z of hydraulic pumps giving rise to pressure ripple (fluid born

s s

vibration) in the hydraulic power circuit., measurement of these two values for a given ripple source is

extremely important for design and development of low noise pumps and hydraulic power systems, and

for this reason, there is a valid need for such an international standard to experimental measurement

of source flow ripple Qs and source impedance Z .

However, as discussed in the paragraph below, the so-called “secondary source method” presented in

the first edition requires a very complex test system as well as signal processing technique, making

its implementation highly difficult; because of this, no country except for the UK, the proposer, has yet

adopted ISO 10767-1 as a national standard.
The difficulty can be explained as follows.

To determine the two characteristic values of the source flow ripple, Q , and source impedance, Z , a

s s

secondary ripple source is located in the test circuit to generate wide range ripples in the test system.

Frequency characteristics of Z , arising from the secondary source, are first determined, followed by

measurement of Q of the test pump on the basis of the test pump itself. This means that measurement

of the harmonics of the pressure ripple is made with both the test pump and the secondary source

in operation. As the result, the measurement accuracy of the harmonic component of the test pump

deteriorates significantly as we come close to harmonic frequency level, where differences between

the harmonic frequency of the test pump ripple and that of the secondary source become small. To

deal with the problem, very complicated signal processing such as compensation is performed, but

its practical effect is quite limited. In addition, the standard specifies use of a rotary valve for the

secondary source of wide range (50 Hz ~ 4k Hz) ripples, but there is no provision as to the design and

frequency characteristics.

These problems arise from the requirement for the secondary source, whereas the method proposed by

[2] [3]

Weddfelt and Kojima allows measurement of delivery ripple characteristics (Q ) and the internal

source (Z ) on the sole basis of pressure ripple generated by the test pump. This makes the test system

quite simple and allows superior accuracy to be achieved without complex processing of signals. The

method according to the approaches of Weddfelt and Kojima, respectively, is the same in principle, the

only difference between the two being the arrangement of the piping. The present proposal represents

[3] [2]

the method according to Kojima, while annexing that of Weddfelt for the purpose of reference.

vi © ISO 2015 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 10767-1:2015(E)
Hydraulic fluid power — Determination of pressure ripple
levels generated in systems and components —
Part 1:
Method for determining source flow ripple and source
impedance of pumps
1 Scope

This part of ISO 10767 establishes a test procedure for measuring the source flow ripple and source

impedance of positive-displacement hydraulic pumps. It is applicable to all types of positive-

displacement pumps operating under steady-state conditions, irrespective of size, provided that the

pumping frequency is in the range from 50 Hz to 400Hz.

Source flow ripple causes fluid borne vibration (pressure ripple) and then airborne noise from

hydraulic systems. This procedure covers a frequency range and pressure range that have been found

to cause many circuits to emit airborne noise which presents a major difficulty in design of hydraulic

fluid power systems. Once the source flow ripple and source impedance of hydraulic fluid power pump

are known, the pressure ripple generated by the pump in the fluid power system can be calculated by

computer simulation using the known ripple propagation characteristics of the system components.

As such, this part of ISO 10767 allows the design of low noise fluid power systems to be realized by

establishing a uniform procedure for measuring and reporting the source flow ripple and the source

impedance characteristics of hydraulic fluid power pumps.

In this part of ISO 10767, calculation is made for blocked acoustic pressure ripple as an example of the

pressure ripple. An explanation of the methodology and theoretical basis for this test procedure is given

in Annex B. The test procedure is referred to here as the two pressures/two systems method. Ratings are

obtained as follows:

a) source flow ripple (in the standard “Norton” model) amplitude, in cubic meter per second[m /s],

and phase, in degree, over 10 individual harmonics of pumping frequency;

b) source flow ripple (in the modified model) amplitude, in cubic meter per second [m /s], and phase,

in degree, over 10 individual harmonics of pumping frequency; and its time history wave form,

c) source impedance amplitude, in Newton second per meter to the power of five [(Ns)/m ]., and

phase, in degree, over 10 individual harmonics of pumping frequency;
6 5

d) blocked acoustic pressure ripple, in MPa (1 MPa = 10 Pa) or in bar (1 bar = 10 Pa), over 10 individual

harmonics of pumping frequency; and the RMS average of the pressure ripple harmonic f to f .

1 10
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 5598, Fluid power systems and components — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.

© ISO 2015 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO 10767-1:2015(E)
3.1
source flow ripple

fluctuating component of flow-rate generated within the pump, which is independent of the

characteristics of the connected circuit

Note 1 to entry: Since there exist the following two definitions of the pump source flow ripple, it shall be used

with distinct discrimination:

— source flow ripple in the standard “Norton” model, Q , is the source flow ripple implicitly assumed to be

generated at the pump outlet, as shown in Figure 1 a);

— source flow ripple in the “modified” model, Q *, is the source flow ripple assumed to be generated at the

inner end of the discharge flow line, as shown in Figure 1 b).

Note 2 to entry: The theoretical pump source flow ripple which is calculated from computer simulation using the

dimensions and configuration of the pump, physical properties of the fluid and operating conditions corresponds

to the pump flow ripple (3.2) in the modified model, Q *.
3.2
flow ripple

fluctuating component of flow-rate of the hydraulic fluid, caused by interaction of source flow ripple

(3.1) with the system
3.3
pressure ripple

fluctuating component of pressure in the hydraulic fluid, caused by interaction of the source flow ripple

(3.1) with the system
3.4
blocked acoustic pressure ripple

pressure ripple (3.3) that would be generated at the pump discharge port when fluid is discharged into a

circuit of infinite impedance (3.5)
3.5
impedance

complex ratio of the pressure ripple (3.3) to the flow ripple (3.2) occurring at a given point in a hydraulic

system and at a given frequency
3.6
source impedance
impedance (3.5) of a pump at the discharge port in the standard “Norton” model
3.7
harmonic

sinusoidal component of the pressure ripple (3.3) or flow ripple (3.2) occurring at an integer multiple of

the pumping frequency (3.8)

Note 1 to entry: A harmonic can be represented by its amplitude and phase, or, alternatively, by its real and

imaginary components, provided that in this part of ISO 10767 the real and imaginary components are used in

the arithmetic calculations.
3.8
pumping frequency

frequency given by the product of the shaft rotational frequency (3.9) and the number of pumping

elements on that shaft
Note 1 to entry: It is expressed in hertz.
2 © ISO 2015 – All rights reserved
---------------------- Page: 8 ----------------------
ISO 10767-1:2015(E)
3.9
shaft rotational frequency

frequency (in hertz) given by the shaft rotational speed (in revolutions per minute) divided by 60

Note 1 to entry: Since the calculations in Clause 8 are all carried out using SI unit, all variables and constants

shall be expressed in SI units, except for reporting of the end results.
a) Standard “Norton” model
b) Modified model
Key
1 discharge passageway
2 discharge line
3 pump exit
Figure 1 — Modelling of pump pulsation source
4 Instrumentation
4.1 Static measurements
The instruments used to measure
a) shaft rotational speed,
b) mean pressure,
c) mean discharge flow-rate, and
d) fluid temperature
© ISO 2015 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO 10767-1:2015(E)

shall have an accuracy throughout each test within the limits specified in Table 1.

NOTE The percentage limits are the of the value of the quantity being measured and not the maximum test

values or the maximum reading of the instrument.
Table 1 — Permissible errors of static measurements
Shaft rotational Mean flow Mean pressure Temperature
frequency % % °C
±0,5 ±2,0 ±2,0 ±2,0
4.2 Dynamic measurements

The instruments used for measurement of pressure ripple shall have the following characteristics:

a) resonant frequency ≥ 30 kHz;
b) linearity ≤ ± 1 %.

The instruments need not respond to steady-state pressure. It can be advantageous to filter out any

steady-state signal component by using a high-pass filter. This filter shall not introduce additional

amplitude or phase error exceeding 1 % or 2°, respectively, at the pumping frequency.

4.3 Frequency analysis of pressure ripple

A suitable instrument shall be used to measure the harmonic amplitude and phase (or its real and

imaginary components) of pressure ripple, for individual harmonics of the pumping frequency up to

3,5 kHz. The instrument shall be capable of measuring the pressure ripple from two pressure transducers

simultaneously. The respective two pressure ripple signals of system 1 and system 2 shall be sampled in

an instrument using external trigger signal obtained from a fixed reference on the pump shaft.

This instrument shall have the following accuracy and resolution for harmonic measurements over the

frequency range from 50 Hz to 4 000 Hz:
a) amplitude within the range of ±1 %;
b) phase within the range of ±1°;
c) frequency within the range of ±0,5 %.

This can be achieved using a common type analysing recorder and then carrying out the spectral

analyses by calculating discrete Fourier transforms (DFTs) of the time history data on a post processing

digital computer. Annex B contains a tutorial explanation of this frequency analysis method.

NOTE In order to improve the accuracy of Fourier transformation, pump speed shall be adjusted minutely

while observing the monitor of the analysing recorder so that the higher (e.g. 10th) harmonic amplitude peak

appears nearly at the assigned higher (e.g. 10th) harmonic frequency (i.e. in case of f being 225 Hz, f = 2,25 kHz)

1 10
of the pumping frequency.
5 Pump installation
5.1 General

The pump shall be installed in the attitude recommended by the manufacture and mounted in such a

manner that the response of the mounting-to-pump vibration is minimized.
4 © ISO 2015 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 10767-1:2015(E)
5.2 Drive vibration

The electric motor and associated drive coupling shall not generate torsional vibration in the pump

shaft. If necessary, the pump and the driving unit shall be isolated from each other to eliminate vibration

generated by the electric motor.
5.3 Reference signal

A means of producing a reference signal relative to the pump shaft rotation shall be included, as one of

essential elements in measurement according to this part of ISO 10767. The signal shall be an electrical

pulse occurring once per revolution, with sharply defined rising and falling edges. This signal is used

as an external trigger signal of analysing recorder, as well as for measurement of the shaft rotational

speed. A magnetic gap detector (or a photo sensor) a satisfactory means of providing the required

characteristics of reference signal mentioned above.
6 Test conditions and setting
6.1 General

Pump shaft speed, mean discharge pressure and fluid temperature are set to the values of required

test conditions. These operating conditions shall be maintained throughout each test within the limits

specified in Table 2.
Table 2 — Permissible variations in test conditions
Test parameter Permissible variation
Mean flow ±2,0 %
Mean pressure ±2,0 %
Shaft rotational speed ±0,5 %
Temperature ±2,0 °C
6.2 Mean flow

Mean flow is measured by the positive-displacement type flow meter installed on the outlet line of

loading valve 2.
6.3 Mean discharge pressure

Mean discharge pressure shall be measured electrically using a piezoresistance type transducer or a

strain gauge type transducer mounted in the adapter before loading valve 1.

A bourdon type pressure gauge shall not be used for measurement of the mean discharge pressure.

6.4 Pump shaft speed

Pump shaft speed is measured by the magnetic gap detector (or photo sensor) installed on the pump

shaft. Shaft rotational frequency (Hz) is given by the shaft rotational speed (rev/min) divided by 60.

6.5 Fluid temperature
Temperature of the fluid shall be that measured at the pump inlet.
© ISO 2015 – All rights reserved 5
---------------------- Page: 11 ----------------------
ISO 10767-1:2015(E)
6.6 Fluid property

Density, viscosity and bulk modulus of the test fluid shall be known to an accuracy within the limits

specified in Table 3.

NOTE The percentage limits are of the error of the estimated quantity to the real value

Table 3 — Required accuracy of fluid property data
Property Required accuracy
Density ±2,0 %
Viscosity ±5,0 %
Bulk modulus ±5,0 %
7 Test rig
7.1 General

The test rig shall be installed as shown in Figure 2. The test rig shall include all fluid filters, fluid

coolers, reservoir, loading valves and any ancillary pumps required to meet operating conditions of the

hydraulic pump. Specific features are described in 7.2 to 7.10.
7.2 Test pump
The test pump shall be installed in the “as-delivered” condition.
7.3 Test fluid

Type of the test hydraulic fluid and the quality of filtration shall be in accordance with the pump

manufacturer’s recommendations.
7.4 Inlet line

Internal diameter of the inlet line to the pump shall be in accordance with the pump manufacturer’s

recommendations. Care shall be exercised when assembling the inlet line to prevent air leakage into the

circuit. The supply pressure shall be in accordance with the pump manufacturer’s recommendations

and, if necessary, a boost pump shall be used. If a boost pump is used, the pressure and flow ripple of

the boost pump shall be taken into account, so that they do not affect the test results.

7.5 Inlet pressure gauge (for static pressure)

The inlet pressure gauge of Bourdon tube type shall be mounted at the same height as the inlet fitting.

Otherwise, the gauge shall be calibrated for any height difference therefrom.
6 © ISO
...

SLOVENSKI STANDARD
SIST ISO 10767-1:2016
01-maj-2016
1DGRPHãþD
SIST ISO 10767-1:1998

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þUSDON

Hydraulic fluid power - Determination of pressure ripple levels generated in systems and

components - Part 1: Method for determining source flow ripple and source impedance of

pumps

Transmissions hydrauliques - Détermination des niveaux d'onde de pression engendrés

dans les circuits et composants - Partie 1: Méthode de détermination de l'onde de flux de

la source et de l'impédance de la source des pompes
Ta slovenski standard je istoveten z: ISO 10767-1:2015
ICS:
23.100.10 +LGUDYOLþQHþUSDONHLQPRWRUML Pumps and motors
SIST ISO 10767-1:2016 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 10767-1:2016
---------------------- Page: 2 ----------------------
SIST ISO 10767-1:2016
INTERNATIONAL ISO
STANDARD 10767-1
Second edition
2015-10-01
Hydraulic fluid power —
Determination of pressure ripple
levels generated in systems and
components —
Part 1:
Method for determining source flow
ripple and source impedance of pumps
Transmissions hydrauliques — Détermination des niveaux d’onde de
pression engendrés dans les circuits et composants —
Partie 1: Méthode de détermination de l’onde de flux de la source et
de l’impédance de la source des pompes
Reference number
ISO 10767-1:2015(E)
ISO 2015
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SIST ISO 10767-1:2016
ISO 10767-1:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

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ii © ISO 2015 – All rights reserved
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SIST ISO 10767-1:2016
ISO 10767-1:2015(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Instrumentation .................................................................................................................................................................................................... 3

4.1 Static measurements.......................................................................................................................................................................... 3

4.2 Dynamic measurements ................................................................................................................................................................. 4

4.3 Frequency analysis of pressure ripple ................................................................................................................................ 4

5 Pump installation ................................................................................................................................................................................................ 4

5.1 General ........................................................................................................................................................................................................... 4

5.2 Drive vibration ........................................................................................................................................................................................ 5

5.3 Reference signal ..................................................................................................................................................................................... 5

6 Test conditions and setting ........................................................................................................................................................................ 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Mean flow .................................................................................................................................................................................................... 5

6.3 Mean discharge pressure ............................................................................................................................................................... 5

6.4 Pump shaft speed.................................................................................................................................................................................. 5

6.5 Fluid temperature ................................................................................................................................................................................ 5

6.6 Fluid property .......................................................................................................................................................................................... 6

7 Test rig ............................................................................................................................................................................................................................. 6

7.1 General ........................................................................................................................................................................................................... 6

7.2 Test pump .................................................................................................................................................................................................... 6

7.3 Test fluid ....................................................................................................................................................................................................... 6

7.4 Inlet line ........................................................................................................................................................................................................ 6

7.5 Inlet pressure gauge (for static pressure) ....................................................................................................................... 6

7.6 Pump discharge line ........................................................................................................................................................................... 7

7.6.1 General...................................................................................................................................................................................... 7

7.6.2 Pump discharge port connection ....................................................................................................................... 8

7.6.3 Reference pipe ................................................................................................................................................................... 8

7.6.4 Connecting pipe ................................................................................................................................................................ 8

7.6.5 Extension pipe ................................................................................................................................................................... 9

7.7 Pressure transducer ........................................................................................................................................................................... 9

7.7.1 Dynamic pressure transducer .............................................................................................................................. 9

7.7.2 Static pressure transducer ...................................................................................................................................... 9

7.8 Loading valve ............................................................................................................................................................................................ 9

7.9 Back pressure valve ............................................................................................................................................................................ 9

7.10 Safety valve ................................................................................................................................................................................................. 9

8 Test procedure .....................................................................................................................................................................................................10

8.1 General ........................................................................................................................................................................................................10

8.2 Frequency analyses of pressure ripple............................................................................................................................11

8.3 Evaluation of source flow ripple, Q , in the standard “Norton” model.................................................11

8.4 Evaluation of source impedance, Z , in the standard “Norton” model .................................................12

8.5 Evaluation of source flow ripple, Q *, in the modified model ......................................................................12

8.6 Evaluation of blocked acoustic pressure ripple rating ......................................................................................13

9 Test report ................................................................................................................................................................................................................13

9.1 General information and test conditions .......................................................................................................................13

9.2 Test results...............................................................................................................................................................................................13

10 Identification statement (Reference to this part of ISO 10767) .......................................................................14

Annex A (normative) Test forms ............................................................................................................................................................................15

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Annex B (informative) Two pressures/two systems method .....................................................................................................21

Bibliography .............................................................................................................................................................................................................................28

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SIST ISO 10767-1:2016
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Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 8,

Product testing.

This second edition cancels and replaces the first edition (ISO 10767-1:1996), which has been

technically revised.

ISO 10767 consists of the following parts, under the general title Hydraulic fluid power — Determination

of pressure ripple levels generated in systems and components:
— Part 1: Precision method for pumps
— Part 2: Simplified method for pumps
— Part 3: Method for motors
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Introduction

The first edition of ISO 10767-1, published in 1996, was developed with a view to provide means for

measurement (experimental determination) of the set of two characteristic values consisting of source

flow ripple Q and source impedance Z of hydraulic pumps giving rise to pressure ripple (fluid born

s s

vibration) in the hydraulic power circuit., measurement of these two values for a given ripple source is

extremely important for design and development of low noise pumps and hydraulic power systems, and

for this reason, there is a valid need for such an international standard to experimental measurement

of source flow ripple Qs and source impedance Z .

However, as discussed in the paragraph below, the so-called “secondary source method” presented in

the first edition requires a very complex test system as well as signal processing technique, making

its implementation highly difficult; because of this, no country except for the UK, the proposer, has yet

adopted ISO 10767-1 as a national standard.
The difficulty can be explained as follows.

To determine the two characteristic values of the source flow ripple, Q , and source impedance, Z , a

s s

secondary ripple source is located in the test circuit to generate wide range ripples in the test system.

Frequency characteristics of Z , arising from the secondary source, are first determined, followed by

measurement of Q of the test pump on the basis of the test pump itself. This means that measurement

of the harmonics of the pressure ripple is made with both the test pump and the secondary source

in operation. As the result, the measurement accuracy of the harmonic component of the test pump

deteriorates significantly as we come close to harmonic frequency level, where differences between

the harmonic frequency of the test pump ripple and that of the secondary source become small. To

deal with the problem, very complicated signal processing such as compensation is performed, but

its practical effect is quite limited. In addition, the standard specifies use of a rotary valve for the

secondary source of wide range (50 Hz ~ 4k Hz) ripples, but there is no provision as to the design and

frequency characteristics.

These problems arise from the requirement for the secondary source, whereas the method proposed by

[2] [3]

Weddfelt and Kojima allows measurement of delivery ripple characteristics (Q ) and the internal

source (Z ) on the sole basis of pressure ripple generated by the test pump. This makes the test system

quite simple and allows superior accuracy to be achieved without complex processing of signals. The

method according to the approaches of Weddfelt and Kojima, respectively, is the same in principle, the

only difference between the two being the arrangement of the piping. The present proposal represents

[3] [2]

the method according to Kojima, while annexing that of Weddfelt for the purpose of reference.

vi © ISO 2015 – All rights reserved
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SIST ISO 10767-1:2016
INTERNATIONAL STANDARD ISO 10767-1:2015(E)
Hydraulic fluid power — Determination of pressure ripple
levels generated in systems and components —
Part 1:
Method for determining source flow ripple and source
impedance of pumps
1 Scope

This part of ISO 10767 establishes a test procedure for measuring the source flow ripple and source

impedance of positive-displacement hydraulic pumps. It is applicable to all types of positive-

displacement pumps operating under steady-state conditions, irrespective of size, provided that the

pumping frequency is in the range from 50 Hz to 400Hz.

Source flow ripple causes fluid borne vibration (pressure ripple) and then airborne noise from

hydraulic systems. This procedure covers a frequency range and pressure range that have been found

to cause many circuits to emit airborne noise which presents a major difficulty in design of hydraulic

fluid power systems. Once the source flow ripple and source impedance of hydraulic fluid power pump

are known, the pressure ripple generated by the pump in the fluid power system can be calculated by

computer simulation using the known ripple propagation characteristics of the system components.

As such, this part of ISO 10767 allows the design of low noise fluid power systems to be realized by

establishing a uniform procedure for measuring and reporting the source flow ripple and the source

impedance characteristics of hydraulic fluid power pumps.

In this part of ISO 10767, calculation is made for blocked acoustic pressure ripple as an example of the

pressure ripple. An explanation of the methodology and theoretical basis for this test procedure is given

in Annex B. The test procedure is referred to here as the two pressures/two systems method. Ratings are

obtained as follows:

a) source flow ripple (in the standard “Norton” model) amplitude, in cubic meter per second[m /s],

and phase, in degree, over 10 individual harmonics of pumping frequency;

b) source flow ripple (in the modified model) amplitude, in cubic meter per second [m /s], and phase,

in degree, over 10 individual harmonics of pumping frequency; and its time history wave form,

c) source impedance amplitude, in Newton second per meter to the power of five [(Ns)/m ]., and

phase, in degree, over 10 individual harmonics of pumping frequency;
6 5

d) blocked acoustic pressure ripple, in MPa (1 MPa = 10 Pa) or in bar (1 bar = 10 Pa), over 10 individual

harmonics of pumping frequency; and the RMS average of the pressure ripple harmonic f to f .

1 10
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 5598, Fluid power systems and components — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.

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3.1
source flow ripple

fluctuating component of flow-rate generated within the pump, which is independent of the

characteristics of the connected circuit

Note 1 to entry: Since there exist the following two definitions of the pump source flow ripple, it shall be used

with distinct discrimination:

— source flow ripple in the standard “Norton” model, Q , is the source flow ripple implicitly assumed to be

generated at the pump outlet, as shown in Figure 1 a);

— source flow ripple in the “modified” model, Q *, is the source flow ripple assumed to be generated at the

inner end of the discharge flow line, as shown in Figure 1 b).

Note 2 to entry: The theoretical pump source flow ripple which is calculated from computer simulation using the

dimensions and configuration of the pump, physical properties of the fluid and operating conditions corresponds

to the pump flow ripple (3.2) in the modified model, Q *.
3.2
flow ripple

fluctuating component of flow-rate of the hydraulic fluid, caused by interaction of source flow ripple

(3.1) with the system
3.3
pressure ripple

fluctuating component of pressure in the hydraulic fluid, caused by interaction of the source flow ripple

(3.1) with the system
3.4
blocked acoustic pressure ripple

pressure ripple (3.3) that would be generated at the pump discharge port when fluid is discharged into a

circuit of infinite impedance (3.5)
3.5
impedance

complex ratio of the pressure ripple (3.3) to the flow ripple (3.2) occurring at a given point in a hydraulic

system and at a given frequency
3.6
source impedance
impedance (3.5) of a pump at the discharge port in the standard “Norton” model
3.7
harmonic

sinusoidal component of the pressure ripple (3.3) or flow ripple (3.2) occurring at an integer multiple of

the pumping frequency (3.8)

Note 1 to entry: A harmonic can be represented by its amplitude and phase, or, alternatively, by its real and

imaginary components, provided that in this part of ISO 10767 the real and imaginary components are used in

the arithmetic calculations.
3.8
pumping frequency

frequency given by the product of the shaft rotational frequency (3.9) and the number of pumping

elements on that shaft
Note 1 to entry: It is expressed in hertz.
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ISO 10767-1:2015(E)
3.9
shaft rotational frequency

frequency (in hertz) given by the shaft rotational speed (in revolutions per minute) divided by 60

Note 1 to entry: Since the calculations in Clause 8 are all carried out using SI unit, all variables and constants

shall be expressed in SI units, except for reporting of the end results.
a) Standard “Norton” model
b) Modified model
Key
1 discharge passageway
2 discharge line
3 pump exit
Figure 1 — Modelling of pump pulsation source
4 Instrumentation
4.1 Static measurements
The instruments used to measure
a) shaft rotational speed,
b) mean pressure,
c) mean discharge flow-rate, and
d) fluid temperature
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shall have an accuracy throughout each test within the limits specified in Table 1.

NOTE The percentage limits are the of the value of the quantity being measured and not the maximum test

values or the maximum reading of the instrument.
Table 1 — Permissible errors of static measurements
Shaft rotational Mean flow Mean pressure Temperature
frequency % % °C
±0,5 ±2,0 ±2,0 ±2,0
4.2 Dynamic measurements

The instruments used for measurement of pressure ripple shall have the following characteristics:

a) resonant frequency ≥ 30 kHz;
b) linearity ≤ ± 1 %.

The instruments need not respond to steady-state pressure. It can be advantageous to filter out any

steady-state signal component by using a high-pass filter. This filter shall not introduce additional

amplitude or phase error exceeding 1 % or 2°, respectively, at the pumping frequency.

4.3 Frequency analysis of pressure ripple

A suitable instrument shall be used to measure the harmonic amplitude and phase (or its real and

imaginary components) of pressure ripple, for individual harmonics of the pumping frequency up to

3,5 kHz. The instrument shall be capable of measuring the pressure ripple from two pressure transducers

simultaneously. The respective two pressure ripple signals of system 1 and system 2 shall be sampled in

an instrument using external trigger signal obtained from a fixed reference on the pump shaft.

This instrument shall have the following accuracy and resolution for harmonic measurements over the

frequency range from 50 Hz to 4 000 Hz:
a) amplitude within the range of ±1 %;
b) phase within the range of ±1°;
c) frequency within the range of ±0,5 %.

This can be achieved using a common type analysing recorder and then carrying out the spectral

analyses by calculating discrete Fourier transforms (DFTs) of the time history data on a post processing

digital computer. Annex B contains a tutorial explanation of this frequency analysis method.

NOTE In order to improve the accuracy of Fourier transformation, pump speed shall be adjusted minutely

while observing the monitor of the analysing recorder so that the higher (e.g. 10th) harmonic amplitude peak

appears nearly at the assigned higher (e.g. 10th) harmonic frequency (i.e. in case of f being 225 Hz, f = 2,25 kHz)

1 10
of the pumping frequency.
5 Pump installation
5.1 General

The pump shall be installed in the attitude recommended by the manufacture and mounted in such a

manner that the response of the mounting-to-pump vibration is minimized.
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5.2 Drive vibration

The electric motor and associated drive coupling shall not generate torsional vibration in the pump

shaft. If necessary, the pump and the driving unit shall be isolated from each other to eliminate vibration

generated by the electric motor.
5.3 Reference signal

A means of producing a reference signal relative to the pump shaft rotation shall be included, as one of

essential elements in measurement according to this part of ISO 10767. The signal shall be an electrical

pulse occurring once per revolution, with sharply defined rising and falling edges. This signal is used

as an external trigger signal of analysing recorder, as well as for measurement of the shaft rotational

speed. A magnetic gap detector (or a photo sensor) a satisfactory means of providing the required

characteristics of reference signal mentioned above.
6 Test conditions and setting
6.1 General

Pump shaft speed, mean discharge pressure and fluid temperature are set to the values of required

test conditions. These operating conditions shall be maintained throughout each test within the limits

specified in Table 2.
Table 2 — Permissible variations in test conditions
Test parameter Permissible variation
Mean flow ±2,0 %
Mean pressure ±2,0 %
Shaft rotational speed ±0,5 %
Temperature ±2,0 °C
6.2 Mean flow

Mean flow is measured by the positive-displacement type flow meter installed on the outlet line of

loading valve 2.
6.3 Mean discharge pressure

Mean discharge pressure shall be measured electrically using a piezoresistance type transducer or a

strain gauge type transducer mounted in the adapter before loading valve 1.

A bourdon type pressure gauge shall not be used for measurement of the mean discharge pressure.

6.4 Pump shaft speed

Pump shaft speed is measured by the magnetic gap detector (or photo sensor) installed on the pump

shaft. Shaft rotational frequency (Hz) is given by the shaft rotational speed (rev/min) divided by 60.

6.5 Fluid temperature
Temperature of the fluid shall be that measured at the pump inlet.
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6.6 Fluid property

Density, viscosity and bulk modulus of the test fluid shall be known to an accuracy within the limits

specified in Table 3.

NOTE The percentage limits are of the error of the estimated quantity to the real value

Table 3 — Required accuracy of fluid property data
...

NORME ISO
INTERNATIONALE 10767-1
Deuxième édition
2015-10-01
Transmissions hydrauliques —
Détermination des niveaux d’onde de
pression engendrés dans les circuits
et composants —
Partie 1:
Méthode de détermination de l’onde
de flux de la source et de l’impédance
de la source des pompes
Hydraulic fluid power — Determination of pressure ripple levels
generated in systems and components —
Part 1: Method for determining source flow ripple and source
impedance of pumps
Numéro de référence
ISO 10767-1:2015(F)
ISO 2015
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ISO 10767-1:2015(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2015, Publié en Suisse

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l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
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ii © ISO 2015 – Tous droits réservés
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ISO 10767-1:2015(F)
Sommaire Page

Avant-propos ................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Domaine d’application ................................................................................................................................................................................... 1

2 Référence normative ........................................................................................................................................................................................ 2

3 Termes et définitions ....................................................................................................................................................................................... 2

4 Instrumentation .................................................................................................................................................................................................... 4

4.1 Mesurages statiques ........................................................................................................................................................................... 4

4.2 Mesurages dynamiques ................................................................................................................................................................... 4

4.3 Analyse de fréquence de l’onde de pression ................................................................................................................. 4

5 Installation de la pompe ............................................................................................................................................................................... 5

5.1 Généralités .................................................................................................................................................................................................. 5

5.2 Vibration de l’entraînement ........................................................................................................................................................ 5

5.3 Signal de référence .............................................................................................................................................................................. 5

6 Conditions d’essai et réglage ................................................................................................................................................................... 5

6.1 Généralités .................................................................................................................................................................................................. 5

6.2 Écoulement moyen .............................................................................................................................................................................. 5

6.3 Pression de refoulement moyenne ........................................................................................................................................ 6

6.4 Vitesse de l’arbre de la pompe................................................................................................................................................... 6

6.5 Température du fluide ...................................................................................................................................................................... 6

6.6 Propriétés du fluide ............................................................................................................................................................................ 6

7 Montage d’essai ..................................................................................................................................................................................................... 6

7.1 Généralités .................................................................................................................................................................................................. 6

7.2 Pompe d’essai........................................................................................................................................................................................... 6

7.3 Fluide d’essai ............................................................................................................................................................................................ 6

7.4 Conduite d’aspiration ........................................................................................................................................................................ 6

7.5 Manomètre à l’aspiration (pour la pression statique) .......................................................................................... 7

7.6 Conduite de refoulement de la pompe ............................................................................................................................... 7

7.6.1 Généralités ............................................................................................................................................................................ 7

7.6.2 Raccordement à l’orifice de refoulement de la pompe ................................................................... 8

7.6.3 Tuyauterie de référence ............................................................................................................................................. 8

7.6.4 Tuyauterie de raccordement ................................................................................................................................. 8

7.6.5 Tuyauterie d’extension ............................................................................................................................................... 9

7.7 Capteur de pression ............................................................................................................................................................................ 9

7.7.1 Capteur de pression dynamique ........................................................................................................................ 9

7.7.2 Capteur de pression statique ................................................................................................................................ 9

7.8 Soupape de charge ............................................................................................................................................................................... 9

7.9 Soupape de retenue ............................................................................................................................................................................ 9

7.10 Soupape de sûreté ................................................................................................................................................................................ 9

8 Mode opératoire d’essai.............................................................................................................................................................................10

8.1 Généralités ...............................................................................................................................................................................................10

8.2 Analyses de fréquence de l’onde de pression ............................................................................................................11

8.3 Évaluation de l’onde d’écoulement de la source, Qs, dans le modèle «Norton» normalisé 11

8.4 Évaluation de l’impédance de la source, Z , dans le modèle «Norton» normalisé .....................12

8.5 Évaluation de l’onde d’écoulement de la source, Q *, dans le modèle modifié ............................12

8.6 Évaluation de la valeur nominale de l’onde de pression acoustique de court-circuit ............13

9 Rapport d’essai ....................................................................................................................................................................................................13

9.1 Informations générales et conditions d’essai ............................................................................................................13

9.2 Résultats d’essai ..................................................................................................................................................................................14

10 Phrase d’identification (Référence à la présente partie de l’ISO 10767) .................................................14

Annexe A (normative) Formulaires d’essai ................................................................................................................................................15

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ISO 10767-1:2015(F)

Annexe B (informative) Méthode des deux pressions/deux systèmes ..........................................................................22

Bibliographie ...........................................................................................................................................................................................................................29

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ISO 10767-1:2015(F)
Avant-propos

L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes

nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est

en général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l’ISO participent également aux travaux.

L’ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents

critères d’approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www.

iso.org/directives).

L’attention est appelée sur le fait que certains des éléments du présent document peuvent faire l’objet de

droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de

brevets reçues par l’ISO (voir www.iso.org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer

un engagement.

Pour une explication de la signification des termes et expressions spécifiques de l’ISO liés à

l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion de l’ISO aux principes

de l’OMC concernant les obstacles techniques au commerce (OTC), voir le lien suivant: Avant-propos —

Informations supplémentaires.

Le comité chargé de l’élaboration du présent document est l’ISO/TC 131, Transmissions hydrauliques et

pneumatiques, sous-comité SC 8, Essais des produits.

Cette deuxième édition annule et remplace la première édition (ISO 10767-1:1996), dont elle constitue

une révision technique.

L’ISO 10767 comprend les parties suivantes, présentées sous le titre général Transmissions

hydrauliques — Détermination des niveaux d’onde de pression engendrés dans les circuits et composants:

— Partie 1: Méthode de précision pour les pompes
— Partie 2: Méthode simplifiée pour les pompes
— Partie 3: Méthode pour les moteurs
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ISO 10767-1:2015(F)
Introduction

La première édition de l’ISO 10767-1, publiée en 1996, a été élaborée en vue d’offrir un moyen de

mesurer (détermination expérimentale) le jeu de deux valeurs caractéristiques composé de l’onde

d’écoulement de la source, Qs, et de l’impédance de la source, Zs, des pompes hydrauliques engendrant

l’onde de pression (vibration transmise par le fluide) dans le circuit de transmissions hydrauliques. Le

mesurage de ces deux valeurs pour une source d’onde donnée est très important pour la conception et

la mise au point de systèmes de transmissions hydrauliques et de pompes à bruit réduit; c’est pourquoi

l’établissement d’une telle Norme internationale traitant de la détermination expérimentale de l’onde

d’écoulement de la source, Qs, et de l’impédance de la source, Zs, répond à un besoin légitime.

Toutefois, comme évoqué dans le paragraphe ci-dessous, la « méthode de la source secondaire »

présentée dans la première édition nécessite le recours à un système d’essai et à une technique de

traitement de signaux extrêmement complexes, ce qui rend sa mise en œuvre particulièrement difficile;

de ce fait, aucun pays, à l’exception du Royaume-Uni, qui est à l’origine de sa proposition, n’a jusqu’ici

adopté l’ISO 10767-1 comme norme nationale.
Cette difficulté peut s’expliquer par ce qui suit.

Pour déterminer les deux valeurs caractéristiques de l’onde d’écoulement de la source Qs et Zs

de l’impédance de la source, on place une source d’onde secondaire dans le circuit d’essai afin

d’engendrer des ondes longue période dans le système d’essai. On commence alors par déterminer les

caractéristiques de fréquence de l’impédance de la source, Zs, provenant de la source secondaire, avant

de mesurer l’onde d’écoulement de la source, Qs, de la pompe d’essai sur la base de la pompe d’essai elle-

même. Cela signifie que le mesurage de l’harmonique de l’onde de pression est réalisé alors que la pompe

d’essai et la source secondaire sont en fonctionnement; par conséquent, la précision de mesurage de la

composante harmonique de la pompe d’essai diminue de façon significative à mesure que l’on approche

du niveau de fréquence harmonique où les différences entre la fréquence harmonique de l’onde de la

pompe d’essai et celle de la source secondaire sont faibles. Pour régler ce problème, on a recours à des

techniques de traitement de signaux extrêmement complexes, comme la compensation, qui s’avèrent

avoir peu d’effet dans la pratique. En outre, cette norme prescrit l’utilisation d’un tiroir rotatif pour la

source secondaire d’ondes longue période (50 Hz~4 kHz), mais ne prévoit aucune disposition en ce qui

concerne les caractéristiques de conception et de fréquence.

Les problèmes résultent tous de la nécessité de la source secondaire, alors que les méthodes proposées

[2] [3]

par Weddfelt et Kojima permettent de mesurer les caractéristiques de l’onde fournie (Qs) et la

source interne (Zs) en se basant uniquement sur l’onde de pression engendrée par la pompe d’essai. Leur

emploi permet de simplifier le système d’essai, et d’obtenir une plus grande précision sans passer par

un traitement complexe des signaux. La méthode basée respectivement sur les approches de Weddfelt

et Kojima, sont identiques dans leur principe, la seule différence entre elles concernant la disposition de

[3]

la tuyauterie. La présente proposition correspond à la méthode proposée par Kojima , tandis que la

[2]
méthode de Weddfelt est incluse en annexe à titre de référence.
vi © ISO 2015 – Tous droits réservés
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NORME INTERNATIONALE ISO 10767-1:2015(F)
Transmissions hydrauliques — Détermination des
niveaux d’onde de pression engendrés dans les circuits
et composants —
Partie 1:
Méthode de détermination de l’onde de flux de la source et
de l’impédance de la source des pompes
1 Domaine d’application

La présente partie de l’ISO 10767 établit un mode opératoire d’essai pour le mesurage de l’onde

d’écoulement de la source et de l’impédance de la source des pompes hydrauliques volumétriques.

Elle s’applique à tous les types de pompes volumétriques fonctionnant dans des conditions de régime

permanent, quelle que soit leur taille, à condition que la fréquence de pompage soit comprise entre

50 Hz et 400 Hz.

L’onde d’écoulement de la source provoque la vibration transmise par le fluide (onde de pression)

puis des bruits aériens émis par les systèmes hydrauliques. Le mode opératoire couvre une gamme

de fréquences et de pressions connues pour provoquer l’émission, par de nombreux circuits, de

bruits aériens constituant une difficulté majeure dans la conception de systèmes de transmissions

hydrauliques. Si l’onde d’écoulement de la source et l’impédance de la source de la pompe de

transmissions hydrauliques sont connues, l’onde de pression engendrée par la pompe dans le système

de transmissions hydrauliques peut être calculée au moyen d’une simulation sur ordinateur, à partir

des caractéristiques connues de propagation d’onde des composants du système. La présente norme

permet ainsi de concevoir des systèmes de transmissions hydrauliques à bruit réduit, en établissant un

mode opératoire uniforme pour le mesurage et la consignation des caractéristiques d’onde d’écoulement

de la source et d’impédance de la source des pompes de transmissions hydrauliques.

Dans la présente partie de l’ISO 10767, le calcul est réalisé pour l’onde de pression acoustique de

court-circuit, qui constitue un exemple d’onde de pression. Une explication de la méthodologie et des

fondements théoriques du mode opératoire d’essai est donnée en Annexe B. Dans ce texte, le mode

opératoire d’essai est appelé méthode des deux pressions/deux systèmes. Les valeurs nominales sont

obtenues sous les formes suivantes:

a) l’amplitude de l’onde d’écoulement de la source (dans le modèle « Norton » normalisé), en

mètres cubes par seconde [m /s], et sa phase, en degrés, sur 10 harmoniques individuelles de la

fréquence de pompage;

b) l’amplitude de l’onde d’écoulement de la source (dans le modèle modifié), en mètres cubes par

seconde [m /s], et sa phase, en degrés, sur 10 harmoniques individuelles de la fréquence de

pompage, et l’historique de sa forme d’onde;

c) l’amplitude de l’impédance de la source, en Newtons secondes par mètre à la puissance cinq [(Ns)/

m ], et sa phase, en degrés, sur 10 harmoniques individuelles de la fréquence de pompage;

6 5

d) l’onde de pression acoustique de court-circuit, en MPa (1 MPa = 10 Pa) ou en bar (1 bar = 10 Pa),

sur dix harmoniques individuelles de la fréquence de pompage, et la moyenne efficace des

harmoniques f à f de l’onde de pression.
1 10
© ISO 2015 – Tous droits réservés 1
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ISO 10767-1:2015(F)
2 Référence normative

La présente partie de l’ISO 10767 s’applique à tous les types de pompes volumétriques fonctionnant

dans des conditions de régime permanent, quelle que soit leur taille, à condition que la fréquence de

pompage soit comprise entre 50 Hz et 400 Hz.
ISO 5598, Transmissions hydrauliques et pneumatiques — Vocabulaire
3 Termes et définitions

Pour les besoins de la présente partie de l’ISO 10767, les termes et définitions donnés dans l’ISO 5598

ainsi que les suivants s’appliquent.
3.1
onde d’écoulement de la source

composant fluctuant de débit engendré à l’intérieur de la pompe, qui est indépendant des caractéristiques

du circuit relié

Note 1 à l’article: Étant donné qu’il existe deux définitions (voir ci-dessous) pour l’onde d’écoulement de la source

de la pompe, celle-ci doit être clairement identifiée:

— onde d’écoulement de la source dans le modèle «Norton» normalisé, Qs: onde d’écoulement de la source que

l’on suppose implicitement être engendrée au refoulement de la pompe, comme illustré à la Figure 1(a);

— onde d’écoulement de la source dans le modèle «modifié», Qs*: onde d’écoulement de la source que l’on suppose

être engendrée à l’extrémité intérieure de la conduite de refoulement, comme illustré à la Figure 1(b).

Note 2 à l’article: L’onde d’écoulement théorique de la source de la pompe, calculée au moyen d’une simulation sur

ordinateur à partir des dimensions et de la configuration de la pompe, des propriétés physiques du fluide, et des

conditions de fonctionnement correspond à l’onde d’écoulement de la pompe dans le modèle modifié, Qs*.

3.2
onde d’écoulement

composant fluctuant de débit du fluide hydraulique, provoqué par l’interaction entre l’onde d’écoulement

de la source et le système
3.3
onde de pression

composant fluctuant de pression dans le fluide hydraulique, provoqué par l’interaction entre l’onde

d’écoulement de la source et le système
3.4
onde de pression acoustique de court-circuit

onde de pression qui serait engendrée à l’orifice de refoulement de la pompe en cas de refoulement du

fluide dans un circuit d’impédance infinie
3.5
impédance

rapport complexe entre l’onde de pression et l’onde d’écoulement se produisant à un point donné d’un

système hydraulique et à une fréquence donnée
3.6
impédance de la source

impédance d’une pompe à l’orifice de refoulement dans le modèle «Norton» normalisé

2 © ISO 2015 – Tous droits réservés
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ISO 10767-1:2015(F)
3.7
harmonique

composant sinusoïdal de l’onde de pression ou de l’onde d’écoulement se produisant à un multiple entier

de la fréquence de pompage

Note 1 à l’article: Une harmonique peut être représentée par son amplitude et sa phase, ou bien par ses composants

réel et imaginaire, à condition que pour la présente partie de l’ISO 10767, les composants réel et imaginaire soient

utilisés dans les calculs arithmétiques.
3.8
fréquence de pompage

fréquence donnée par le produit de la fréquence de rotation de l’arbre et le nombre d’éléments de

pompage présents sur cet arbre
Note 1 à l’article: Elle est exprimée en hertz.
3.9
fréquence de rotation de l’arbre

fréquence, en hertz, donnée par la vitesse de rotation de l’arbre, en tours par minute, divisée par 60

Note 1 à l’article: Tous les calculs de l’Article 7 étant effectués à l’aide d’unités SI, l’ensemble des variables et des

constantes doivent être exprimées en unités SI, excepté pour la consignation des résultats finaux.

(a) Modèle «Norton» normalisé
(b) Modèle modifié
Légende
1 passage de refoulement
2 conduit de refoulement
3 sortie de la pompe
Figure 1 — Modélisation de la source de pulsation de la pompe
© ISO 2015 – Tous droits réservés 3
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ISO 10767-1:2015(F)
4 Instrumentation
4.1 Mesurages statiques
Les instruments utilisés pour mesurer
a) la vitesse de rotation de l’arbre,
b) la pression moyenne,
c) le débit de refoulement moyen et
d) la température du fluide

doivent garder une précision contenue dans les limites spécifiées dans le Tableau 1 tout au long de

chaque essai.

NOTE Les limites en pourcentage s’appliquent à la valeur de la grandeur mesurée et non aux valeurs

maximales de l’essai ou à l’indication maximale de l’instrument.
Tableau 1 — Erreurs admissibles des mesurages statiques
Fréquence de rota-
Écoulement moyen Pression moyenne Température
tion de l’arbre
% % °C
± 0,5 ± 2,0 ± 2,0 ± 2,0
4.2 Mesurages dynamiques

Les instruments utilisés pour mesurer l’onde de pression doivent présenter les caractéristiques suivantes:

a) fréquence de résonance ≥ 30 kHz;
b) linéarité ≤ ± 1 %.

Il est inutile que les instruments réagissent à la pression de régime permanent. Il peut être avantageux

de filtrer tout composant de signal de régime permanent en utilisant un filtre passe-haut. Ce filtre ne doit

pas introduire d’amplitude ou d’erreur de phase supplémentaire dépassant 1 % ou 2°, respectivement,

à la fréquence de pompage.
4.3 Analyse de fréquence de l’onde de pression

Un instrument approprié doit être utilisé pour mesurer l’amplitude et la phase d’harmonique (ou

des composants d’harmonique réels et imaginaires) de l’onde de pression, pour des harmoniques

individuelles de la fréquence de pompage jusqu’à 3,5 kHz. L’instrument doit pouvoir mesurer l’onde de

pression depuis deux capteurs de pression simultanément. Les signaux d’onde de pression respectifs

du système 1 et du système 2 doivent être échantillonnés dans un instrument à l’aide du signal de

déclenchement externe provenant d’une référence fixe située sur l’arbre de la pompe.

Cet instrument doit présenter une précision et une résolution conformes à ce qui suit pour les mesurages

d’harmoniques, sur la gamme de fréquences comprise entre 50 Hz et 4 000 Hz:
a) amplitude: ± 1 %;
b) phase: ± 1°;
c) fréquence: ± 0,5 %.

Il est possible d’obtenir cela en utilisant un enregistreur-analyseur de type courant, puis en effectuant

les analyses spectrales en calculant les transformées de Fourier discrètes (TFD) des données historiques

4 © ISO 2015 – Tous droits réservés
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ISO 10767-1:2015(F)

sur un calculateur numérique de post-traitement. L’Annexe B comporte une explication pratique de

cette méthode d’analyse de fréquence.

NOTE Pour améliorer la précision de la transformation de Fourier, il faut régler minutieusement la

vitesse de la pompe tout en observant le moniteur de l’enregistreur-analyseur, de telle sorte que la pointe de

ème

l’amplitude d’harmonique la plus élevée (par exemple, la 10 ) apparaisse quasiment au niveau de la fréquence

ème

harmonique la plus élevée (par exemple, la 10 ) assignée (c’est-à-dire que si f = 225 Hz, f = 2,25 kHz) de la

1 10
fréquence de pompage.
5 Installation de la pompe
5.1 Généralités

La pompe doit être installée dans la position recommandée par le fabricant, et montée de sorte à

minimiser la réaction du montage à sa vibration.
5.2 Vibration de l’entraînement

Le moteur électrique et l’accouplement d’entraînement associé ne doivent pas engendrer de vibration

torsionnelle de l’arbre de la pompe. Si nécessaire, la pompe et l’unité d’entraînement doivent être isolées

l’une de l’autre pour éliminer la vibration engendrée par le moteur électrique.
5.3 Signal de référence

Un moyen de produire un signal de référence correspondant à la rotation de l’arbre de la pompe doit

être inclus, comme il s’agit d’un des éléments essentiels du mesurage selon la présente partie de

l’ISO 10767. Le signal doit être une impulsion électrique se produisant une fois par tour, et présentant

des flancs montant et descendant bien définis. Ce signal est utilisé comme signal de déclenchement

externe de l’enregistreur-analyseur, ainsi que pour le mesurage de la vitesse de rotation de l’arbre. Un

détecteur magnétique (ou un capteur photo-électrique) constitue un moyen satisfaisant pour fournir

les caractéristiques exigées pour le signal de référence, telles que mentionnées ci-dessus.

6 Conditions d’essai et réglage
6.1 Généralités

La vitesse de l’arbre de la pompe, la pression de refoulement moyenne et la température du fluide sont

réglées sur les valeurs correspondant aux conditions d’essai exigées. Ces conditions de fonctionnement

doivent être conservées, tout au long de chaque essai, dans les limites spécifiées dans le Tableau 2.

Tableau 2 — Écarts admissibles dans les conditions d’essai
Paramètre d’essai Écart admissible
Écoulement moyen ± 2,0 %
Pression moyenne ± 2,0 %
Vitesse de rotation de l’arbre ± 0,5 %
Température ± 2,0 °C
6.2 Écoulement moyen

L’écoulement moyen est mesuré par le débitmètre de type volumétrique installé sur la conduite de

refoulement de la soupape de charge 2.
© ISO 2015 – Tous droits réservés 5
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ISO 10767-1:2015(F)
6.3 Pression de refoulement moyenne
La pression de refoulement moyenne doit être déterminée pa
...

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