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ISO 362-3:2022

(Main)

Acoustics — Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories

Acoustics — Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories

This document specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N by using a semi anechoic chamber with a dynamometer installed. The specifications are intended to achieve an acoustical correlation between testing the exterior noise of road vehicles in a semi anechoic chamber and outdoor testing as described in ISO 362-1. This document provides all necessary specifications and procedures for indoor testing to obtain results which are comparable to typical run-to-run variations of measurements in today’s type approval tests. This document provides a method designed to meet the requirements of simplicity as far as they are consistent with the reproducibility of results under the operating conditions of the vehicle. NOTE 1 The results obtained by this method give an objective measure of the noise emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the noise annoyance of different classes of motor vehicles is not simply related to the indications of a sound measuring system. As annoyance is strongly related to personal human perception, physiological human conditions, culture, and environmental conditions, there is a large variation and annoyance is therefore not useful as a parameter to describe a specific vehicle condition. NOTE 2 If measurements are carried out in rooms which do not fulfil the requirements stated in this document, the results obtained can deviate from the results using the specified conditions.

Acoustique — Mesurage du bruit émis par les véhicules routiers en accélération — Méthode d'expertise — Partie 3: Essais en intérieur pour les catégories M et N

General Information

Status
Published
Publication Date
28-Sep-2022
ICS
17.140.30 - Noise emitted by means of transport
Technical Committee
ISO/TC 43/SC 1 - Noise
Drafting Committee
ISO/TC 43/SC 1/WG 42 - Joint ISO/TC 43/SC 1 - ISO/TC 22 WG: Measurement of noise emission (external) from road vehicles
Parallel Committee
ISO/TC 22 - Road vehicles
Current Stage
6060 - International Standard published
Start Date
29-Sep-2022
Due Date
24-Apr-2023
Completion Date
29-Sep-2022
Ref Project

Relations

Revises
ISO 362-3:2016 - Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories
Effective Date
08-May-2020
ISO 362-3:2022 - Acoustics — Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories Released:29. 09. 2022ISO 362-3:2022 - Acoustics — Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories Released:29. 09. 2022
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ISO 362-3:2022 - Acoustics — Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 3: Indoor testing M and N categories Released:29. 09. 2022
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66 pages
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Standards Content (Sample)


INTERNATIONAL ISO
STANDARD 362-3
Second edition
2022-09
Acoustics — Measurement of noise
emitted by accelerating road vehicles
— Engineering method —
Part 3:
Indoor testing M and N categories
Acoustique — Mesurage du bruit émis par les véhicules routiers en
accélération — Méthode d'expertise —
Partie 3: Essais en intérieur pour les catégories M et N
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms.2
5 Acceleration for vehicles of categories M1 and M2 having a maximum authorized
mass not exceeding 3 500 kg, and of category N1 . 5
5.1 Applicability and conditions . . . 5
5.2 Calculation of acceleration . 5
5.2.1 Calculation procedure for vehicles with manual transmission, automatic
transmission, adaptive transmission, and continuously variable
transmission (CVT) tested with locked gear ratios . 5
5.2.2 Calculation procedure for vehicles with automatic transmission, adaptive
transmission, and CVT tested with non-locked gear ratios. 5
5.3 Calculation of the target acceleration . 5
5.4 Calculation of the reference acceleration . 5
5.5 Partial power factor, k . 6
P
6 Instrumentation . 6
6.1 Instruments for acoustical measurement . 6
6.1.1 General . 6
6.1.2 Calibration . . . 6
6.2 Conformity with requirements. 7
6.3 Instrumentation for speed measurement . 7
6.4 Meteorological instrumentation . 7
7 Test room requirements . 7
7.1 General . 7
7.2 Test room dimensions . 8
7.2.1 Test room dimensions for measurements where the length of the test track
is greater than 20m . 10
7.3 Acoustical qualification of the room . 11
7.3.1 General . 11
7.3.2 Validation of free-field conditions of the microphone array . 11
7.3.3 Qualification procedure . 14
7.4 Condition of the floor .15
7.5 Cooling, ventilation, air temperature, exhaust gas management.15
7.6 Background noise. 15
8 Dynamometer requirements .16
8.1 Type of texture of the rollers . 16
8.2 Diameter of the rollers. 16
8.3 Reproducibility of the pass-by dynamics. 17
8.4 Single-axle or multi-axle operation . 17
8.5 Noise emission limit under operating conditions produced by the dynamometer
rollers . 17
9 Test procedures .18
9.1 General . 18
9.2 Microphone array — Hardware and software . 18
9.3 Vehicle fixing system . 18
9.4 Conditions of the vehicle . 18
9.4.1 General conditions . 18
9.4.2 Test mass of the vehicle . 19
iii
9.4.3 Tyre selection and tyre condition . 19
9.4.4 Calculation of total engine power . 20
9.4.5 Battery state of charge . . .20
9.4.6 Additional sound emitting devices . 20
9.4.7 Vehicle cooling fans or cooling systems . 20
9.5 Operating conditions . 20
9.5.1 Vehicles of categories M1, M2 having a maximum authorized mass not
exceeding 3 500 kg, and N1 . 20
9.5.2 Vehicles of categories M2 having a maximum authorized mass exceeding
3 500 kg, M3, N2 and N3 . 21
9.6 Measurement readings and reported values . 22
9.6.1 General .22
9.6.2 Data compilation .23
9.6.3 Vehicles of categories M1 and M2 having a maximum authorized mass not
exceeding 3 500 kg, and of category N1 . 23
9.6.4 Vehicles of categories M2 having a maximum authorized mass exceeding
3 500 kg, M3, N2, and N3 . 23
9.7 Measurement uncertainty . .23
10 Test methods and test report .24
10.1 General . 24
10.2 Variant A . 24
10.2.1 General . 24
10.2.2 Power train noise . 24
10.2.3 Tyre/road noise .25
10.2.4 Calculation of the total vehicle noise using variant A . 25
10.3 Test report . 25
Annex A (normative) Validation of method .27
Annex B (normative) Procedure for measurement, evaluation, and calculation of tyre/road
noise when using variant A .31
Annex C (informative) Procedure for description of tyre torque influence by an energetic
model .
...

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