本欧洲标准描述了一种用于测量代表交通噪声降低装置的机载隔音的固有特性的数量的测试方法:隔音指数。 测试方法适用于以下应用: - 确定要沿道路安装的降噪装置的机载隔音的固有特性，在现场或实验室条件下进行测量; - 确定实际使用中降噪装置的机载隔音的原位固有特性; - 施工完成后设计规格与实际性能数据的比较; - 验证减噪装置的长期性能（重复使用该方法）; - 新产品的交互式设计过程，包括安装手册的制定。 测试方法不是用于确定要安装在混响条件下的降噪装置的机载隔音的固有特性，例如。内部隧道或深沟或下盖。 结果表示为可能在100Hz和5kHz之间的三分之一倍频程频带中的频率的函数。如果不可能的话

This document describes a test method for measuring a quantity representative of the intrinsic characteristics of airborne sound insulation for traffic noise reducing devices: the sound insulation index. The test method is intended for the following applications: - determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed along roads, to be measured either in situ or in laboratory conditions; - determination of the in situ intrinsic characteristics of airborne sound insulation of noise reducing devices in actual use; - comparison of design specifications with actual performance data after the completion of the construction work; - verification of the long term performance of noise reducing devices (with a repeated application of the method); - interactive design process of new products, including the formulation of installation manuals. The test method is not intended for the determination of the intrinsic characteristics of airborne sound insulation of noise reducing devices to be installed in reverberant conditions, e.g. inside tunnels or deep trenches or under covers. Results are expressed as a function of frequency in one-third octave bands, where possible, between 100 Hz and 5 kHz. If it is not possible to get valid measurement results over the whole frequency range indicated, the results will be given in a restricted frequency range and the reasons for the restriction(s) will be clearly reported.