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《Journal of Southeast University(Natural Science Edition)》 2017-05
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Prediction method for noise attenuation in elevated rail transit lines

Song Xiaodong;Li Qi;Wu Dingjun;School of Transportation,Southeast University;Department of Bridge Engineering ,Tongji University;  
A numerical method based on the two-dimensional( 2D) vibro-acoustic model was proposed to predict the sound attenuation of rail noises and bridge noises in elevated rail transit lines.First,a refined two-and-a-half dimensional( 2. 5D) acoustic model was used to evaluate the applicability of the traditional simplified line source model. Then,the theoretical plate model and three-dimensional( 3D) vehicle-track-bridge coupling model were used to discuss the feasibility of using the2 D model to simulate the vibrations of 3D bridges and rails. Finally,the 2D vibro-acoustic model was used to calculate the sound attenuation of bridge noises and rail noises in the far field. The accuracy of the 2D method was validated by compared wilhe the results obtained by the 2. 5D method.The research shows that the variation of the bridge vibration and the rail vibration is insignificant along the longitudinal axis of the track above 100 Hz. The proposed 2D method for the simulation of bridge noise and rail noise attenuation can achieve a certain accuracy above 100 Hz,and thus it can predict the A-weighted sound pressure levels in the far field.
【Fund】: 国家自然科学基金资助项目(51608116);; 江苏省自然科学基金资助项目(BK20160681)
【CateGory Index】: U211.3
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