ISO/TS 19425:2015
(Main)Reciprocating internal combustion engines — Measurement method for air cleaners — Sound power level of combustion air inlet noise and insertion loss using sound pressure
Reciprocating internal combustion engines — Measurement method for air cleaners — Sound power level of combustion air inlet noise and insertion loss using sound pressure
ISO/TS 19425:2015 specifies the measurement method and requirements for combustion air inlet noise of air cleaners which are installed on reciprocating internal combustion engines, including laboratory measurement (engineering method and survey method) and site measurement (survey method). ISO/TS 19425:2015 applies to all air cleaners installed on reciprocating internal combustion engines (reciprocating internal combustion engine is referred to as engine except particular explanation in the following text) falling within the field of application of ISO 3046‑1 and/or other air induction installation.
Moteurs alternatifs à combustion interne — Méthode de mesure du bruit des purificateurs d'air — Niveau de puissance sonore du bruit d'entrée d'air de combustion et de perte d'insertion utilisant une pression sonore
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TECHNICAL ISO/TS
SPECIFICATION 19425
First edition
2015-12-15
Reciprocating internal combustion
engines — Measurement method for
air cleaners — Sound power level
of combustion air inlet noise and
insertion loss using sound pressure
Moteurs alternatifs à combustion interne — Méthode de mesure du
bruit des purificateurs d’air — Niveau de puissance sonore du bruit
d’entrée d’air de combustion et de perte d’insertion utilisant une
pression sonore
Reference number
©
ISO 2015
© 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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test environment . 5
4.1 General . 5
4.2 Criterion for background noise. 5
4.3 Criterion for acoustic adequacy of test environment . 6
5 Instrumentation . 6
5.1 General . 6
5.2 Calibration . 6
5.3 Application . 6
6 Installation and operation conditions . 7
6.1 General . 7
6.2 Installation condition . 7
6.3 Operation condition . 8
7 Measurement . 8
7.1 General . 8
7.2 Measurement uncertainty . 9
7.3 Characteristic source dimension .10
7.4 Measurement radius .10
7.5 Measurement surface and area .10
7.6 Microphone arrays .10
8 Calculation .12
8.1 General .12
8.2 Calculation of sound power level .12
8.2.1 Mean time-averaged sound pressure levels .12
8.2.2 Corrections for background noise .13
8.2.3 Corrections for environmental .13
8.2.4 Surface time-averaged sound pressure levels .14
8.2.5 Sound power levels .14
8.3 Calculation of insertion loss .14
9 Information to be recorded .15
10 Test report .16
Annex A (normative) Qualification procedures for the acoustic environment .17
Annex B (normative) Calculation of A-weighted sound power levels from frequency band levels 20
Annex C (normative) Sound power level under reference meteorological conditions.22
Bibliography .24
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 70, Internal combustion engines.
iv © ISO 2015 – All rights reserved
Introduction
This Technical Specification specifies methods for measuring the sound power level of combustion air
inlet noise and the insertion loss of air cleaners installed on reciprocating internal combustion engines.
Sound power level of combustion air inlet noise, insertion loss, and transmission loss are parameters to
characterize the acoustic performance of air cleaners. Sound power levels of combustion air inlet noise
and insertion loss are important parameters to characterize the acoustic matching performance of air
cleaners and reciprocating internal combustion engines. Transmission loss is the difference in sound
power level of combustion air inlet noise between the noise before and after transmitting through the
air cleaner, which is the parameter to characterize the acoustic performance of the air cleaner itself and
is irrelevant with the reciprocating internal combustion engine. The matching parameters of the sound
power level of combustion air inlet noise and the insertion loss are used in this Technical Specification
as the measurement parameters.
The enveloping surface method of this Technical Specification is applicable for engineering method
(accuracy grade 2) and survey method (accuracy grade 3). Engineering method allows the determination
of the A-weighted and frequency-band sound power level, survey method allows the determination
of the A-weighted sound power level. The measurement result of sound power level is rounded to the
nearest 0,1 dB.
In the combustion air inlet noise control of air cleaner, the relevant members (including manufacturer,
installation, and the user) should make effective communication of acoustic information which
is obtained by measurement. The measurement result is valid only in the specified measurement
conditions by using the instrumentation as specified in this Technical Specification to obtain a clear
acoustic value. Engineering method or survey method may be selected according to the purpose of
noise measurement and measurement conditions.
The measurement surface defined based on the characteristics of noise source under test in this
Technical Specification is spherical. To meet the requirements of the measurement uncertainty, this
Technical Specification gives specification of the distance from the installation location of the noise
source to the reflecting plane (ground).
TECHNICAL SPECIFICATION ISO/TS 19425:2015(E)
Reciprocating internal combustion engines —
Measurement method for air cleaners — Sound power
level of combustion air inlet noise and insertion loss using
sound pressure
1 Scope
This Technical Specification specifies the measurement method and requirements for combustion
air inlet noise of air cleaners which are installed on reciprocating internal combustion engines,
including laboratory measurement (engineering method and survey method) and site measurement
(survey method).
This Technical Specification applies to all air cleaners installed on reciprocating internal combustion
engines (reciprocating internal combustion engine is referred to as engine except particular explanation
in the following text) falling within the field of application of ISO 3046-1 and/or other air induction
installation.
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 3046-1, Reciprocating internal combustion engines — Performance — Part 1: Declarations of power, fuel
and lubricating oil consumptions, and test methods — Additional requirements for engines for general use
ISO 3046-3, Reciprocating internal combustion engines — Performance — Part 3: Test measurements
ISO 6926, Acoustics — Requirements f
...
TECHNICAL ISO/TS
SPECIFICATION 19425
First edition
2015-12-15
Reciprocating internal combustion
engines — Measurement method for
air cleaners — Sound power level
of combustion air inlet noise and
insertion loss using sound pressure
Moteurs alternatifs à combustion interne — Méthode de mesure du
bruit des purificateurs d’air — Niveau de puissance sonore du bruit
d’entrée d’air de combustion et de perte d’insertion utilisant une
pression sonore
Reference number
©
ISO 2015
© 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
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test environment . 5
4.1 General . 5
4.2 Criterion for background noise. 5
4.3 Criterion for acoustic adequacy of test environment . 6
5 Instrumentation . 6
5.1 General . 6
5.2 Calibration . 6
5.3 Application . 6
6 Installation and operation conditions . 7
6.1 General . 7
6.2 Installation condition . 7
6.3 Operation condition . 8
7 Measurement . 8
7.1 General . 8
7.2 Measurement uncertainty . 9
7.3 Characteristic source dimension .10
7.4 Measurement radius .10
7.5 Measurement surface and area .10
7.6 Microphone arrays .10
8 Calculation .12
8.1 General .12
8.2 Calculation of sound power level .12
8.2.1 Mean time-averaged sound pressure levels .12
8.2.2 Corrections for background noise .13
8.2.3 Corrections for environmental .13
8.2.4 Surface time-averaged sound pressure levels .14
8.2.5 Sound power levels .14
8.3 Calculation of insertion loss .14
9 Information to be recorded .15
10 Test report .16
Annex A (normative) Qualification procedures for the acoustic environment .17
Annex B (normative) Calculation of A-weighted sound power levels from frequency band levels 20
Annex C (normative) Sound power level under reference meteorological conditions.22
Bibliography .24
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 70, Internal combustion engines.
iv © ISO 2015 – All rights reserved
Introduction
This Technical Specification specifies methods for measuring the sound power level of combustion air
inlet noise and the insertion loss of air cleaners installed on reciprocating internal combustion engines.
Sound power level of combustion air inlet noise, insertion loss, and transmission loss are parameters to
characterize the acoustic performance of air cleaners. Sound power levels of combustion air inlet noise
and insertion loss are important parameters to characterize the acoustic matching performance of air
cleaners and reciprocating internal combustion engines. Transmission loss is the difference in sound
power level of combustion air inlet noise between the noise before and after transmitting through the
air cleaner, which is the parameter to characterize the acoustic performance of the air cleaner itself and
is irrelevant with the reciprocating internal combustion engine. The matching parameters of the sound
power level of combustion air inlet noise and the insertion loss are used in this Technical Specification
as the measurement parameters.
The enveloping surface method of this Technical Specification is applicable for engineering method
(accuracy grade 2) and survey method (accuracy grade 3). Engineering method allows the determination
of the A-weighted and frequency-band sound power level, survey method allows the determination
of the A-weighted sound power level. The measurement result of sound power level is rounded to the
nearest 0,1 dB.
In the combustion air inlet noise control of air cleaner, the relevant members (including manufacturer,
installation, and the user) should make effective communication of acoustic information which
is obtained by measurement. The measurement result is valid only in the specified measurement
conditions by using the instrumentation as specified in this Technical Specification to obtain a clear
acoustic value. Engineering method or survey method may be selected according to the purpose of
noise measurement and measurement conditions.
The measurement surface defined based on the characteristics of noise source under test in this
Technical Specification is spherical. To meet the requirements of the measurement uncertainty, this
Technical Specification gives specification of the distance from the installation location of the noise
source to the reflecting plane (ground).
TECHNICAL SPECIFICATION ISO/TS 19425:2015(E)
Reciprocating internal combustion engines —
Measurement method for air cleaners — Sound power
level of combustion air inlet noise and insertion loss using
sound pressure
1 Scope
This Technical Specification specifies the measurement method and requirements for combustion
air inlet noise of air cleaners which are installed on reciprocating internal combustion engines,
including laboratory measurement (engineering method and survey method) and site measurement
(survey method).
This Technical Specification applies to all air cleaners installed on reciprocating internal combustion
engines (reciprocating internal combustion engine is referred to as engine except particular explanation
in the following text) falling within the field of application of ISO 3046-1 and/or other air induction
installation.
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 3046-1, Reciprocating internal combustion engines — Performance — Part 1: Declarations of power, fuel
and lubricating oil consumptions, and test methods — Additional requirements for engines for general use
ISO 3046-3, Reciprocating internal combustion engines — Performance — Part 3: Test measurements
ISO 6926, Acoustics — Requirements f
...
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