声学.道路车辆加速噪声测量的工程方法.第1部分:M和N类

[中文适用范围]： 本文件规定了在典型城市交通条件下测量M类和N类道路车辆发出的噪声的工程方法。 它不包括 ISO 9645 涵盖的 L1 和 L2 类车辆，以及 ISO 362-2 涵盖的 L3、L4 和 L5 类车辆。 该规范旨在再现城市交通正常行驶期间主要噪声源产生的噪声水平（见附件 A）。 该方法旨在满足简单性的要求，只要它们与车辆运行条件下结果的再现性一致即可。 该测试方法需要仅在广阔的开放空间中获得的声学环境。 这些条件通常适用于 — 车辆的型式核准测量， — 制造阶段的测量，以及 — 官方测试站的测量。 注 1：通过该方法获得的结果给出了在规定的测试条件下发出的噪声的客观测量。 需要考虑的是，对不同类别机动车辆噪声烦扰性的主观评价并不简单地与声音测量系统的指示相关。 由于烦恼与个人的感知、人类的生理状况、文化和环境条件密切相关，因此存在很大的变化，因此，它不能作为描述特定车辆状况的参数。 注 2：随机抽查的车辆很少是在理想的声学环境中进行的。 如果在不满足本文件所述要求的声学环境中的道路上进行测量，则获得的结果可能与使用指定条件获得的结果有明显偏差。 [外文原描述]： This document specifies an engineering method for measuring the noise emitted by road vehicles of categories M and N under typical urban traffic conditions. It excludes vehicles of category L1 and L2, which are covered by ISO 9645 , and vehicles of category L3, L4, and L5, which are covered by ISO 362 ‑ 2 . The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic (see Annex A ). 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 acoustical environment that is obtained only in an extensive open space. Such conditions 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 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 measurement system. As annoyance is strongly 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. If measurements are carried out on the road in an acoustical environment that does not fulfil the requirements stated in this document, the results obtained can deviate appreciably from the results obtained using the specified conditions.