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ISO 16254:2016

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Current

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Acoustics Measurement of sound emitted by road vehicles of category M and N at standstill and low speed operation Engineering method
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

05-02-2016

ISO 16254:2016 is derived from ISO 3621 and specifies an engineering method for measuring the sound emitted by M and N category road vehicles at standstill and low speed operating conditions. The specifications reproduce the level of sound which is generated by the principal vehicle sound sources consistent with stationary and low speed vehicle operating conditions relevant for pedestrian safety. The method is designed to meet the requirements of simplicity as far as they are consistent with reproducibility of results under the operating conditions of the vehicle.

The test method requires an acoustic environment which is only obtained in an extensive open space. Such conditions usually exist during the following:

- measurements of vehicles for regulatory certification;

- measurements at the manufacturing stage;

- measurements at official testing stations.

The results obtained by this method give an objective measure of the sound emitted under the specified conditions of test. It is necessary to consider the fact that the subjective appraisal of the annoyance, perceptibility, and/or detectability of different motor vehicles or classes of motor vehicles due to their sound emission are not simply related to the indications of a sound measurement system. As annoyance, perceptibility and/or detectability are strongly related to personal human perception, physiological human condition, culture, and environmental conditions, there are large variations and therefore these terms are not useful as parameters to describe a specific vehicle condition.

Spot checks of vehicles chosen at random rarely occur in an ideal acoustic environment. If measurements are carried out on the road in an acoustic environment which does not fulfil the requirements stated in this International Standard, the results obtained might deviate appreciably from the results obtained using the specified conditions.

In addition, this International Standard provides an engineering method to measure the performance of external sound generation systems intended for the purpose of providing acoustic information to pedestrians on a vehicle's operating condition. This information is reported as objective criteria related to the external sound generation system's sound pressure level, frequency content, and changes in sound pressure level and frequency content as a function of vehicle speed. As such, these measures can provide pedestrians with information on the location, speed, acceleration, and deceleration behaviour of a vehicle. Annex A contains background information relevant in the development of this International Standard.

DevelopmentNote
Supersedes ISO/DIS 16254. (05/2016)
DocumentType
Standard
Pages
40
PublisherName
International Organization for Standardization
Status
Current

Standards Relationship
JIS D 1048:2019 Identical
NEN ISO 16254 : 2016 Identical
BS ISO 16254:2016 Identical
NF ISO 16254 : 2017 Identical

SAE J 2889/1 : 2015 MEASUREMENT OF MINIMUM NOISE EMITTED BY ROAD VEHICLES
ISO 10844:2014 Acoustics Specification of test tracks for measuring noise emitted by road vehicles and their tyres
IEC 60942:2003 Electroacoustics - Sound calibrators
ISO 1176:1990 Road vehicles Masses Vocabulary and codes
ISO 26101:2017 Acoustics Test methods for the qualification of free-field environments
ISO 362-1:2015 Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 1: M and N categories
IEC 61260-1:2014 Electroacoustics - Octave-band and fractional-octave-band filters - Part 1: Specifications
SAE J 2805 : 2015 MEASUREMENT OF NOISE EMITTED BY ACCELERATING ROAD VEHICLES
ISO 2416:1992 Passenger cars — Mass distribution
SAE J 1715 : 2014 HYBRID ELECTRIC VEHICLE (HEV) AND ELECTRIC VEHICLE (EV) TERMINOLOGY
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)

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