高速铁路声屏障几何形状对降噪效果的影响

Influence of geometry shapes of sound barrier on noise reduction effect in high speed railway

针对采用声屏障技术控制高速铁路列车噪声污染时,用具有演算性质的方法计算声屏障插入损失很难实现声屏障精确设计的问题,利用边界元法建立高速铁路区间声屏障降噪预测模型,对声屏障插入损失进行数值计算.研究结果表明:声屏障对高频噪声的隔断好于低频噪声;声屏障越高引起的声压插入损失越大;对比圆弧型、T型、人字型、内倾型、倒L型和直立型声屏障的降噪效果,前两者效果最好,人字型、内倾型和倒L型声屏障略优于直立型声屏障.

While controlling the noise pollution of high speed trains in high speed railway in sound barrier technology, the sound barrier is difficult to be designed accurately by computing insert loss in checking method. So the boundary element method is adopted to establish the noise-reducing prediction model for the sound barrier in high speed railway section. The numerical computation on insert loss is done based on the model. The obtained result shows ： the noise reduction of sound barrier for high frequency noise is better than the one for low frequency noise; the sound pressure insert loss will increase with the increasing of the height of sound barrier; the noise-reducing effect of sound barrier with different geometry shapes, such as arc-type, T-type, A-type, incline-type, inverse-L-type and straight-type, are compared. Arc-type and T-type is the best. A-type, incline-type and inverse-L-type are better than straight-type.