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

LIU Rongzhen,YANG Xinwen,LI Yanmin(School of Mathematics,Physics & Software Eng.,Lanzhou Jiaotong Univ.,Lanzhou 730070,China)  
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.
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