Internal noise analysis and optimization of type A metro

To study the internal vibration noise caused by lightweight train vehicle,based on the finite element model of a type A metro,the acoustics computational model is established;taking the vibration displacement of frequency response of vehicle body plate as acoustics excitation,the inside noise is analyzed by arranging ISO standard field points in the vehicle.The results show that the sound pressure level distribution of all field points is very nonuniform at frequency domain and there exists several bigger peak values commonly.Several optimization schemes for vibration and noise reduction are presented by analyzing the vibration of the target plates.According to the comparison of the schemes,it is found that the vibration and noise can be decreased by improving the plate intensity.The whole intensity and dynamics performance should be considered on the optimized vehicle body to decrease vibration and noise.