计入地面附加衰减的声屏障插入损失估算方法

A method for estimating the insertion loss of sound barriers including the ground additional attenuation

基于理论推导和计算,给出了公路声屏障声学设计中,在考虑地面附加衰减情况下计算插入损失的方法。该方法综合考虑了有限长线声源无限长声屏障绕射声衰减量、有限长线声源地面衰减量及遮蔽角对插入损失的影响。通过与《声屏障声学设计和测量规范》(HJ/T90-2004)的计算结果的对比,验证了该文所给方法的精确性及可行性,并对《声屏障声学设计和测量规范》所给地面衰减修正量进行了商榷。最后,给出了当预测点位于有限长路段中央法线上时,通过计算线声源地面衰减量得到计算插入损失所需参数值,再计算插入损失的简便方法。该研究为存在地面附加衰减情况下有限长声屏障插入损失计算提供了一个新的参考方法。

Based on acoustic theory,a new method for estimating the insertion loss of highway sound barriers was proposed in this study.In the method,the ground additional attenuation was considered,and the effects of the diffraction attenuation of a line sound source with a finite length propagated over a sound barrier with an infinite length,the ground attenuation of a sound source with a finite length and the shielding angle on the insertion loss were integrally included.Compared with“Norm on acoustical design and measurement of noise barriers”(HJ/T90-2004),the method proposed in this study was accurate and feasible.Meanwhile,the correction values of ground attenuation recommended by“Norm on acoustical design and measurement of noise barriers”(HJ/T90-2004)were discussed.Eventually,when the receiver located in the central normal of a road with a finite length,a simple and convenient method for estimating the insertion loss was given.The parameter required for calculating the insertion loss was determined by calculating ground attenuation of the line sound source.This research provided a new way for insertion loss calculation in acoustic design of finite length noise barriers when considering the ground attenuation of a sound source.