Noise Predicting Based on Viaduct Structure of Railway

Elevated railway is an important form of the railway line,noise of the train running in the overhead railway differs from that running in the roadbed line.Especially when the sound barrier is used on the line,impact of the noise radiated from elevated structure on the environment along the line will appear obviously.This paper has established a train-bridge line coupling model with application of the basic theory of dynamics at first,and obtained the force between wheels and rail during the train running;Through taking that as the input of SEA on viaduct structure,the vibration and acoustic radiation of viaduct structure is researched.The model has been validated with application of viaduct structure by vibration analysis and testing.The relationship between parameters,like noise radiation of viaduct structure and stiffness of elasticity bolster,is also studied.The conclusion drawn indicates that changing stiffness of elasticity bolster can improve noise reduction of the sound barrier for the viaduct structure,and it is feasible to predict noise for viaduct structure of railway with theory of dynamics and SEA.