标准编号：ISO 362-1:2007
中文名称：测量加速道路车辆发出的噪声 工程方法 第1部分：M和N类
英文名称：Measurement of noise emitted by accelerating road vehicles — Engineering method — Part 1: M and N categories
发布日期：2007-07
标准范围
This part of ISO 362 specifies an engineering method for measuring the noise emitted by road vehicles ofcategories M and N under typical urban traffic conditions. It excludes vehicles of category L1 and L2, whichare covered by ISO 9645, and vehicles of category L3, L4 and L5 covered by ISO 362-2.The specifications are intended to reproduce the level of noise generated by the principal noise sourcesduring normal driving in urban traffic (see Annex A).The method is designed to meet the requirements of simplicity as far as they are consistent withreproducibility of results under the operating conditions of the vehicle.The test method requires an acoustical environment that is only obtained in an extensive open space. Suchconditions are usually provided for? type approval measurements of a vehicle,? measurements at the manufacturing stage, and? measurements at official testing stations.NOTE 1 The results obtained by this method give an objective measure of the noise emitted under the specifiedconditions of test. It is necessary to consider the fact that the subjective appraisal of the noise annoyance of differentclasses of motor vehicles is not simply related to the indications of a sound measurement system. As annoyance isstrongly related to personal human perception, physiological human conditions, culture and environmental conditions,there is a large variation and it is therefore not useful as a parameter to describe a specific vehicle condition.NOTE 2 Spot checks of vehicles chosen at random are rarely made in an ideal acoustical environment. Ifmeasurements are carried out on the road in an acoustical environment which does not fulfil the requirements stated inthis International Standard, the results obtained can deviate appreciably from the results obtained using the specifiedconditions.
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