Abstract: Based on investigation of built highway noise barriers in Jiangsu province, the effect of several factors, including equivalent frequency, traffic flow, etc, on insertion loss of highway noise barriers were analyzed, and the revision was carried out. The results show that the sound source model reflecting characteristic of traffic noise is the key to assess acoustic performance of noise barrier. Meanwhile, there were some construction defects on a few of noise barriers, leading to sound leakage and poor acoustic performance.

Key words: acoustics, noise barriers, insertion loss, equivalent frequency, traffic flow

摘要： 通过对省内高速公路声屏障的实地调研，探讨等效频率、车流量等因素对理论插入损失的影响并对其进行修正。结果表明：反应交通噪声特性的声源模型是合理评价声屏障声学性能的关键；同时部分声屏障工程存在施工质量问题，出现透声现象，导致声学性能较差。

关键词: 声学, 声屏障, 插入损失, 等效频率, 车流量