加速道路车辆的噪音排放测量.工程法.第2部分:L类

[中文适用范围]： 本部分ISO 362规定了在典型城市交通条件下测量L3、L4和L5类道路车辆排放噪声的工程方法。它排除了L1和L2类车辆（由ISO 9645涵盖）、M和N类车辆（由ISO 362-1涵盖）以及L6和L7类车辆。这些规范旨在重现正常城市交通驾驶期间主要噪声源产生的噪声水平，通常是在限速为50公里/小时和70公里/小时的道路上（见附件A）。该方法旨在满足简单性的要求，同时确保在车辆运行条件下结果的可复现性。该测试方法需要一个仅在广阔开放空间中才能获得的声学环境。此类条件通常用于：车辆型式认证测量、制造阶段的测量以及官方测试站的测量。注1：通过此方法获得的结果提供了在指定测试条件下排放噪声的客观度量。必须考虑到，对各类机动车噪声烦恼的主观评价并不简单地与声测量系统的指示相关。由于烦恼与个人人类感知、生理人类状况、文化和环境条件密切相关，因此存在很大差异，因此将其作为描述特定车辆状况的参数是没有用的。注2：随机选择的车辆抽查很少在理想的声学环境中进行。如果在不符合本国际标准规定的声学环境的道路上进行测量，所获得的结果可能与使用指定条件获得的结果有很大偏差。 [外文原描述]： ISO 362-2:2009 specifies an engineering method for measuring the noise emitted by road vehicles of categories L3, L4 and L5 under typical urban traffic conditions. It excludes vehicles of category L1 and L2, which are covered by ISO 9645, vehicles of categories M and N covered by ISO 362-1 and vehicles of categories L6 and L7. The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic, typically on roads with speed limits of 50 km/h and 70 km/h. 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 only obtained 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.