声屏障对交通噪声的A计权声插入损失

A-weighted Insertion Loss of a Screen against Traffic Noise

本文提出了对一宽带噪声,声屏障的A计权声级插入损失△LA在一定误差范围内可用某一特定频率f_e时的声插入损失△L值来代替,对于我国道路交通噪声的频谱可定出f_e为400Hz,误差范围小于1dB,并由交通噪声的线声源模型,得到了无限长屏障对于交通噪声的声插入损失的计算公式。

The A-weighted insertion loss L_A of a screen for a wide band noise can be equivalent to L of the insertion loss at a specific frequency within a cer-tain error. In situation of the traffic noise in China, it shows that equivalent frequency fe is equal to 400 Hz and the maximum error is less than 1 dB. A formula of A-weighted insertion loss provided by an infinite long screen against the road traffic noise which is regarded as a line source is also obtained.