SIST EN 61373:2010
(Main)Railway applications - Rolling stock equipment - Shock and vibration tests (IEC 61373:2010)
Railway applications - Rolling stock equipment - Shock and vibration tests (IEC 61373:2010)
This International Standard specifies the requirements for testing items of equipment intended for use on railway vehicles which are subsequently subjected to vibrations and shock owing to the nature of railway operational environment. To gain assurance that the quality of the equipment is acceptable, it has to withstand tests of reasonable duration that simulate the service conditions seen throughout its expected life. Simulated long-life testing can be achieved in a number of ways each having their associated advantages and disadvantages, the following being the most common: a) amplification: where the amplitudes are increased and the time base decreased; b) time compression: where the amplitude history is retained and the time base is decreased (increase of the frequency); c) decimation: where time slices of the historical data are removed when the amplitudes are below a specified threshold value. The amplification method as stated in a) above, is used in this standard and together with the publications referred to in Clause 2; it defines the default test procedure to be followed when vibration testing items for use on railway vehicles. However, other standards exist and may be used with prior agreement between the manufacturer and the customer. In such cases test certification against this standard will not apply. Where service information is available tests can be performed using the method outlined in Annex A. If the levels are lower than those quoted in this standard, equipment is partially certified against this standard (only for service conditions giving functional test values lower than or equal to those specified in the test report). Whilst this standard is primarily concerned with railway vehicles on fixed rail systems, its wider use is not precluded. For systems operating on pneumatic tyres, or other transportation systems such as trolleybuses, where the level of shock and vibration clearly differ from those obtained on fixed rail systems, the supplier and customer can agree on the test levels at the tender stage. It is recommended that the frequency spectra and the shock duration/amplitude be determined using the guidelines in Annex A. Equipment tested at levels lower than those quoted in this standard cannot be fully certified against the requirements of this standard. An example of this is trolleybuses, whereby body-mounted trolleybus equipment could be tested in accordance with category 1 equipment referred to in the standard. This standard applies to single axis testing. However multi-axis testing may be used with prior agreement between the manufacturer and the customer. The test values quoted in this standard have been divided into three categories dependent only upon the equipment’s location within the vehicle.
Applications ferroviaires - Matériel roulant - Essais de chocs et vibrations (CEI 61373:2010)
Applications ferroviaires - Matériel roulant - Essais de chocs et vibrations (IEC 61373:2010)
La CEI 61373:2010 spécifie les exigences d'essai des matériels destinés à être utilisés sur les véhicules ferroviaires soumis à des vibrations et à des chocs dus à la nature de l'environnement d'exploitation ferroviaire. Pour s'assurer que la qualité d'un matériel est acceptable, celui-ci doit résister à des essais d'une durée raisonnable qui simulent les conditions de service auxquelles il est exposé tout au long de sa vie. Les principaux changements techniques par rapport à l'édition précédente sont les suivants: - changement de la méthode pour calculer le taux d'accélération; - ajout de la notion de certification partielle par rapport à la norme; - ajout de recommandations pour le calcul de la valeur efficace fonctionnelle à partir des données de service, ou de la valeur efficace à partir des niveaux d'ASD.
Železniške naprave - Oprema voznih sredstev - Preskusi na udarce in vibracije (IEC 61373:2010)
Ta mednarodni standard določa zahteve za preskušanje delov opreme, namenjenih uporabi na železniških vozilih, ki so nato zaradi narave obratovalnega okolja železnice izpostavljeni vibracijam in udarcem. Za zagotavljanje sprejemljive kakovosti opreme mora ta prestati razumno dolge preskuse, ki posnemajo obratovalne pogoje, ki se pojavljajo v pričakovani življenjski dobi. Simulirano preskušanje življenjske dobe se lahko izvaja na več načinov, ki imajo vsak svoje prednosti in slabosti, najpogostejši pa so naslednji: a) povečevanje: amplitude se povečujejo, časovna osnova se zmanjšuje; b) časovna kompresija: zgodovina amplitude se ohranja, časovna osnova se zmanjšuje (povečevanje frekvence); c) decimiranje: časovna okna preteklih podatkov se odstranjujejo, ko so amplitude pod določeno mejno vrednostjo. V tem standardu se uporablja metoda povečevanja, navedena pod točko a) zgoraj, skupaj z objavami iz klavzule 2; opredeljuje privzete postopke preskušanja, po katerih je treba ravnati pri preskusih na vibracije izdelkov za uporabo na železniških vozilih. Obstajajo tudi drugi standardi, ki se lahko uporabijo po predhodnem dogovoru med proizvajalcem in stranko. V takšnih primerih certifikacija za preskušanje po tem standardu ne velja. Kadar so na voljo podatki o delovanju, se preskusi lahko izvajajo po metodi, navedeni v Dodatku A. Če so ravni nižje od ravni, navedenih v tem standardu, je oprema delno certificirana po tem standardu (le za pogoje delovanja, pri katerih so vrednosti funkcionalnega preskusa nižje ali enake vrednostim, navedenim v poročilu o preskusu). Čeprav ta standard obravnava predvsem železniška vozila na stalnih železniških sistemih, njegova širša uporaba ni izključena. Pri sistemih, ki obratujejo na pnevmatikah ali drugih prevoznih sistemih, kot so trolejbusi, pri katerih se raven udarcev in vibracij bistveno razlikuje od ravni pri stalnih železniških sistemih, se dobavitelj in stranka o preskusnih ravneh lahko dogovorita v fazi razpisa. Priporočljivo je, da se frekvenčni spektri in trajanje/amplituda udarcev ugotavljajo s pomočjo smernic iz Dodatka A. Oprema, preskušena pri ravneh, nižjih od ravni, navedenih v tem standardu, ne more biti popolnoma certificirana v skladu z zahtevami tega standarda. Takšen primer so trolejbusi, kjer se trolejbusna oprema, nameščena na karoserijo, lahko preskuša v skladu z opremo kategorije 1, navedeno v tem standardu. Ta standard se uporablja za enoosno preskušanje. Po predhodnem dogovoru med proizvajalcem in stranko pa se lahko uporabi tudi večosno preskušanje. Preskusne vrednosti, navedene v tem standardu, so razdeljene na tri kategorije, ki so odvisne samo od mesta opreme v vozilu.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61373:2010
01-december-2010
1DGRPHãþD
SIST EN 61373:1999
Železniške naprave - Oprema voznih sredstev - Preskusi na udarce in vibracije
(IEC 61373:2010)
Railway applications - Rolling stock equipment - Shock and vibration tests (IEC
61373:2010)
Applications ferroviaires - Matériel roulant - Essais de chocs et vibrations (CEI
61373:2010)
Applications ferroviaires - Matériel roulant - Essais de chocs et vibrations (IEC
61373:2010)
Ta slovenski standard je istoveten z: EN 61373:2010
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN 61373:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61373:2010
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SIST EN 61373:2010
EUROPEAN STANDARD
EN 61373
NORME EUROPÉENNE
September 2010
EUROPÄISCHE NORM
ICS 45.060 Supersedes EN 61373:1999
English version
Railway applications -
Rolling stock equipment -
Shock and vibration tests
(IEC 61373:2010)
Applications ferroviaires - Bahnanwendungen –
Matériel roulant - Betriebsmittel von Bahnfahrzeugen –
Essais de chocs et vibrations Prüfungen für Schwingen und Schocken
(CEI 61373:2010) (IEC 61373:2010)
This European Standard was approved by CENELEC on 2010-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61373:2010 E
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SIST EN 61373:2010
EN 61373:2010 - 2 -
Foreword
The text of document 9/1386/FDIS, future edition 2 of IEC 61373, prepared by IEC TC 9, Electrical
equipment and systems for railways, was submitted to the IEC-CENELEC parallel vote and was approved
by CENELEC as EN 61373 on 2010-09-01.
This European Standard supersedes EN 61373:1999.
The main technical changes with regard to the EN 61373:1999 are as follows:
– change of the method to calculate the acceleration ratio which has to be applied to the functional ASD
value to obtain the simulated long-life ASD value;
– addition of the notion of partially certified against this standard;
– suppression of Annex B of the EN 61373:1999 due to the new method to calculate the acceleration
ratio;
– addition of guidance for calculating the functional RMS value from service data or the RMS value from
ASD levels of Figures 2 to 5.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2011-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-09-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61373:2010 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 61373:2010
- 3 - EN 61373:2010
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60068-2-27 2008 Environmental testing - EN 60068-2-27 2009
Part 2-27: Tests - Test Ea and guidance:
Shock
IEC 60068-2-47 2005 Environmental testing - EN 60068-2-47 2005
Part 2-47: Tests - Mounting of specimens for
vibration, impact and similar dynamic tests
IEC 60068-2-64 2008 Environmental testing - EN 60068-2-64 2008
Part 2-64: Tests - Test Fh: Vibration,
broadband random and guidance
ISO 3534-1 2006 Statistics - Vocabulary and symbols - - -
Part 1: General statistical terms and terms
used in probability
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SIST EN 61373:2010
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SIST EN 61373:2010
IEC 61373
®
Edition 2.0 2010-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Railway applications – Rolling stock equipment – Shock and vibration tests
Applications ferroviaires – Matériel roulant – Essais de chocs et vibrations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 45.060 ISBN 978-2-88910-944-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61373:2010
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CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references.8
3 Terms and definitions .9
4 General .10
5 Order of testing.11
6 Reference information required by the test house.11
6.1 Method of mounting and orientation of equipment under test .11
6.2 Reference and check points.11
6.2.1 Fixing point.11
6.2.2 Check point .12
6.2.3 Reference point .12
6.2.4 Measuring point .12
6.3 Mechanical state and functioning during test .12
6.3.1 Mechanical state.12
6.3.2 Functional tests .13
6.3.3 Performance tests.13
6.4 Reproducibility for random vibration tests.13
6.4.1 Acceleration spectral density (ASD) .13
6.4.2 Root mean square value (r.m.s.) .13
6.4.3 Probability density function (PDF) .13
6.4.4 Duration.13
6.5 Measuring tolerances.14
6.6 Recovery .14
7 Initial measurements and preconditioning.14
8 Functional random vibration test conditions.14
8.1 Test severity and frequency range .14
8.2 Duration of functional vibration tests .15
8.3 Functioning during test .15
9 Simulated long-life testing at increased random vibration levels.15
9.1 Test severity and frequency range .15
9.2 Duration of accelerated vibration tests .15
10 Shock testing conditions .16
10.1 Pulse shape and tolerance.16
10.2 Velocity changes .16
10.3 Mounting .16
10.4 Repetition rate.16
10.5 Test severity, pulse shape and direction.16
10.6 Number of shocks.17
10.7 Functioning during test .17
11 Transportation and handling.17
12 Final measurements .17
13 Acceptance criteria .17
14 Report .17
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SIST EN 61373:2010
61373 © IEC:2010 – 3 –
15 Test certificate.18
16 Disposal .18
Annex A (informative) Explanation of service measurements, measuring positions,
methods of recording service data, summary of service data, and method used to obtain
25
random test levels from acquired service data .
Annex B (informative) Figure identifying general location of equipment on railway
vehicles and their resulting test category .32
Annex C (informative) Example of a type test certificate .33
Annex D (informative) Guidance for calculating RMS values from ASD values or levels.34
Figure 1 – Gaussian distribution .9
Figure 2 – Category 1 – Class A – Body-mounted – ASD spectrum .19
Figure 3 – Category 1 – Class B – Body-mounted – ASD spectrum .20
Figure 4 – Category 2 – Bogie mounted – ASD spectrum .21
Figure 5 – Category 3 – Axle mounted – ASD spectrum .22
Figure 6 – Cumulative PDF tolerance bands .23
Figure 7 – Shock test tolerance – Bands half sine pulse .24
Figure A.1 – Standard measuring positions used for axle, bogie (frame) and body .25
Figure A.2 – Typical fatigue strength curve .29
Figure B.1 – General location of equipment on vehicles .32
Figure D.1 – ASD spectrum.35
Table 1 – Test severity and frequency range for functional random vibration tests.14
Table 2 – Test severity and frequency range.15
Table 3 – Test severity, pulse shape and direction.16
Table A.1 – Environment data acquisition summary of the test parameters/conditions.26
Table A.2 – Summary of the r.m.s. acceleration levels obtained from the questionnaire .28
Table A.3 – Test levels obtained from service data using the method shown in Clause A.4 .31
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SIST EN 61373:2010
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
RAILWAY APPLICATIONS –
ROLLING STOCK EQUIPMENT –
SHOCK AND VIBRATION TESTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61373 has been prepared by IEC technical committee 9: Electrical
equipment and systems for railways.
This second edition cancels and replaces the first edition, issued in 1999 and constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows:
– change of the method to calculate the acceleration ratio which has to be applied to the
functional ASD value to obtain the simulated long-life ASD value;
– addition of the notion of partially certified against this standard;
– suppression of Annex B of the first edition due to the new method to calculate the
acceleration ratio;
– addition of guidance for calculating the functional RMS value from service data or the
RMS value from ASD levels of Figures 2 to 5.
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SIST EN 61373:2010
61373 © IEC:2010 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
9/1386/FDIS 9/1397/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
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SIST EN 61373:2010
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INTRODUCTION
This standard covers the requirements for random vibration and shock testing items of
pneumatic, electrical and electronic equipment/components (hereinafter only referred to as
equipment) to be fitted on to railway vehicles. Random vibration is the only method to be used
for equipment/component approval.
The tests contained within this standard are specifically aimed at demonstrating the ability of
the equipment under test to withstand the type of environmental vibration conditions normally
expected for railway vehicles. In order to achieve the best representation possible, the values
quoted in this standard have been derived from actual service measurements submitted by
various bodies from around the world.
This standard is not intended to cover self-induced vibrations as these will be specific to
particular applications.
Engineering judgement and experience is required in the execution and interpretation of this
standard.
This standard is suitable for design and validation purposes; however, it does not exclude the
use of other development tools (such as sine sweep), which may be used to ensure a
predetermined degree of mechanical and operational confidence. The test levels to be applied
to the equipment under test are dictated only by its location on the train (i.e. axle, bogie or
body-mounted).
It should be noted that these tests may be performed on prototypes in order to gain design
information about the product performance under random vibration. However, for test
certification purposes the tests have to be carried out on equipment taken from normal
production.
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SIST EN 61373:2010
61373 © IEC:2010 – 7 –
RAILWAY APPLICATIONS –
ROLLING STOCK EQUIPMENT –
SHOCK AND VIBRATION TESTS
1 Scope
This International Standard specifies the requirements for testing items of equipment intended
for use on railway vehicles which are subsequently subjected to vibrations and shock owing to
the nature of railway operational environment. To gain assurance that the quality of the
equipment is acceptable, it has to withstand tests of reasonable duration that simulate the
service conditions seen throughout its expected life.
Simulated long-life testing can be achieved in a number of ways each having their associated
advantages and disadvantages, the following being the most common:
a) amplification: where the amplitudes are increased and the time base decreased;
b) time compression: where the amplitude history is retained and the time base is decreased
(increase of the frequency);
c) decimation: where time slices of the historical data are removed when the amplitudes are
below a specified threshold value.
The amplification method as stated in a) above, is used in this standard and together with the
publications referred to in Clause 2; it defines the default test procedure to be followed when
vibration testing items for use on railway vehicles. However, other standards exist and may be
used with prior agreement between the manufacturer and the customer. In such cases test
certification against this standard will not apply. Where service information is available tests
can be performed using the method outlined in Annex A. If the levels are lower than those
quoted in this standard, equipment is partially certified against this standard (only for service
conditions giving functional test values lower than or equal to those specified in the test report).
Whilst this standard is primarily concerned with railway vehicles on fixed rail systems, its wider
use is not precluded. For systems operating on pneumatic tyres, or other transportation
systems such as trolleybuses, where the level of shock and vibration clearly differ from those
obtained on fixed rail systems, the supplier and customer can agree on the test levels at the
tender stage. It is recommended that the frequency spectra and the shock duration/amplitude
be determined using the guidelines in Annex A. Equipment tested at levels lower than those
quoted in this standard cannot be fully certified against the requirements of this standard.
An example of this is trolleybuses, whereby body-mounted trolleybus equipment could be
tested in accordance with category 1 equipment referred to in the standard.
This standard applies to single axis testing. However multi-axis testing may be used with prior
agreement between the manufacturer and the customer.
The test values quoted in this standard have been divided into three categories dependent only
upon the equipment’s location within the vehicle.
Category 1 Body mounted
Class A Cubicles, subassemblies, equipment and components mounted directly on or
under the car body.
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SIST EN 61373:2010
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Class B Anything mounted inside an equipment case which is in turn mounted directly on
or under the car body.
NOTE 1 Class B should be used when it is not clear where the equipment is to be located.
Category 2 Bogie mounted
Cubicles, subassemblies, equipment and components which are to be mounted on the bogie of
a railway vehicle.
Category 3 Axle mounted
Subassemblies, equipment and components or assemblies which are to be mounted on the
wheelset assembly of a railway vehicle.
NOTE 2 In the case of equipment mounted on vehicles with one level of suspension such as wagons and trucks,
unless otherwise agreed at the tender stage, axle mounted equipment will be tested as category 3, and all other
equipment will be tested as category 2.
The cost of testing is influenced by the weight, shape and complexity of the equipment under
test. Consequently at the tender stage the supplier may propose a more cost-effective method
of demonstrating compliance with the requirements of this standard. Where alternative
methods are agreed it will be the responsibility of the supplier to demonstrate to his customer
or his representative that the objective of this standard has been met. If an alternative method
of evaluation is agreed, then the equipment tested cannot be certified against the requirement
of this standard.
This standard is intended to evaluate equipment which is attached to the main structure of the
vehicle (and/or components mounted thereon). It is not intended to test equipment which forms
part of the main structure. Main structure in the sense of this standard means car body, bogie
and axle. There are a number of cases where additional or special vibration tests may be
requested by the customer, for example:
a) equipment mounted on, or linked to, items which are known to produce fixed frequency
excitation;
b) equipment such as traction motors, pantographs, shoegear, or suspension components
which may be subjected to tests in accordance with their special requirements, applicable
to their use on railway vehicles. In all such cases the tests carried out should be dealt with
by separate agreement at the tender stage;
c) equipment intended for use in special operational environments as specified by the
customer.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 60068-2-27:2008, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-47:2005, Environmental testing – Part 2-47: Tests – Mounting of specimens for
vibration, impact and similar dynamic tests
IEC 60068-2-64:2008, Environmental testing – Part 2-64: Tests – Test Fh: Vibration,
broadband random and guidance
ISO 3534-1:2006, Statistics – Vocabulary and symbols – Part 1: Probability and general
statistical terms
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SIST EN 61373:2010
61373 © IEC:2010 – 9 –
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60068-2-64 and in
ISO 3534-1 apply as well as the following.
3.1
random vibrations
a vibration the instantaneous value of which cannot be precisely predicted for any given instant
of time
3.2
Gaussian distribution ; normal distribution
a Gaussian, or normal, distribution has a probability density function equal to (see Figure 1):
–(x – x)²
1
P (x) = . 2 . σ²
x
e
σ 2 . π
where:
σ is the r.m.s value;
x is the instantaneous value;
x is the mean value of x .
P (x)
x
+3σ
+2σ
+1σ
x
x
0
x
t
–1σ
–2σ
–3σ
IEC 1099/10
Figure 1 – Gaussian distribution
NOTE According to Figure 1, the probability that the instantaneous acceleration value is between ± a is equal to
the zone under the probability density curve P (x). This means that the instantaneous acceleration value between:
x
• 0 and 1σ represents 68,26 % of the time,
• 1σ and 2σ represents 27,18 % of the time,
• 2σ and 3σ represents 4,30 % of the time.
3.3
Acceleration Spectral Density
ASD
mean-square value of that part of an acceleration signal passed by a narrow-band filter of a
centre frequency, per unit bandwith, in the limit as the bandwith approaches zero and the
averaging time approaches infinity
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3.4
components
pneumatic, electrical, or electronic parts located inside a cubicle
3.5
cubicle
whole equipment, including mechanical parts and especially the structure, (e.g. converter,
inverter, etc.) composed of mounted components
4 General
This standard is intended to highlight any wea
...
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