ISO/FDIS 13332

FINAL DRAFT
International
Standard
ISO/TC 70
Reciprocating internal combustion
Secretariat: SAC
engines — Test code for the
Voting begins on:
measurement of structure-borne
2025-09-17
noise emitted from high-speed
Voting terminates on:
and medium-speed reciprocating
2025-11-12
internal combustion engines
measured at the engine feet
Moteurs alternatifs à combustion interne — Code d'essai pour
le mesurage du bruit solidien émis par les moteurs alternatifs à
combustion interne à vitesse élevée et à vitesse moyenne, mesuré
aux pieds du moteur
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
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LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 70
Reciprocating internal combustion
Secretariat: SAC
engines — Test code for the
Voting begins on:
measurement of structure-borne
noise emitted from high-speed
Voting terminates on:
and medium-speed reciprocating
internal combustion engines
measured at the engine feet
Moteurs alternatifs à combustion interne — Code d'essai pour
le mesurage du bruit solidien émis par les moteurs alternatifs à
combustion interne à vitesse élevée et à vitesse moyenne, mesuré
aux pieds du moteur
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
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TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measure environment . 3
4.1 Acoustic environment .3
4.2 Meteorological conditions .4
5 Measuring instruments . 4
5.1 General rule .4
5.2 Verification . .4
6 Installation and operating conditions . 4
6.1 General rule .4
6.2 Installation conditions .4
6.3 Mounting Requirements .4
6.4 Operating conditions .5
7 Acceleration measurement . 5
7.1 General rule .5
7.2 Uncertainty .5
7.3 Mount selection .6
7.4 Accelerometer Position .6
7.4.1 Recommended Position .6
7.4.2 Alternative arrangement .8
7.5 Accelerometer Installation .10
7.6 Preliminary Test .10
7.7 Formal Test .11
8 Calculation .11
8.1 Calculation of Velocity and Angular Velocity .11
8.2 Calculation of time-averaged velocity levels and time-averaged angular velocity levels
in each measurement direction . 12
9 Recorded Information .12
10 Test Report .13
Annex A (normative) Other connections between the engine and test surroundings . 14
Annex B (normative) Corrections if the accelerometers are not in the contact plane between
the machinery foot and isolator .15
Annex C (normative) Determination of Frequency range of measurement . 17
Annex D (normative) Test record .20
Bibliography .22

iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 70, Internal combustion engines.
This second edition cancels and replaces the first edition (ISO 13332:2000), which has been technically
revised.
The main changes are as follows:
— revised Clause 3;
— "Symbols" in Clause 4 of the previous edition has been deleted and the requirements for "measuring
environment" has been added (see Clause 4);
— "Technical Background" in Clause 5 of the previous edition has been deleted and provisions for "measuring
instruments" has been added (see Clause 5);
— content related to the installation and operating conditions of the measured object has been moved to
Clause 6 of this document (see Clause 6);
— content related to "acceleration measurement" has been moved to Clause 7 of the this document,
requirements of measurement uncertainty have been supplemented; measurements of angular velocity
and angular acceleration have be added (see Clause 7);
— "calculation" has been added (see Clause 8);
— added provisions on "record content" (see Clause 9);
— requirements related to "reporting" has been added (see Clause 10);
— requirements related to "connections between engine and test environment" has been added (see
Annex A);
— content on “sensor contact plane height correction” has been added (see Annex B);
— relevant content of "Frequency range" in the previous edition Clause 7 has been moved to Annex C;

iv
— "Engine-Structure-borne Noise Characterization - Test Report Form" has been moved to Annex D.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

v
Introduction
Noise in bu
...