Analysis of interior noise of metro vehicles in tunnel

In order to study the interior noise characteristics of metro vehicles in tunnel, a tunnelvehicle finite element-boundary element acoustic analysis model was established. Based on the coupling model and field test of B-type metro vehicle, the secondary suspension force excitation and wheel-rail noise excitation were obtained, and the excitation was applied to the vehicle to calculate and analyze the interior noise. Based on the noise test on GuangZhou rail transit line 7, the simulation results are verified, and the influence of structure borne noise and airborne noise on interior noise is studied. The results show that the variation trend of the sound pressure level diagram of each standard point in the vehicle is basically the same, the peak center frequency is concentrated at 630Hz, the main frequency band is 200~1600Hz,A sound level above the bogie is about 1.02~2.35dB(A) higher than the center of the vehicles; The main influence frequency band of structure borne noise on interior noise is 20~200Hz,and the main influence frequency band of airborne noise on interior noise is 500~5000Hz.A sound level at the center of the carriage under structural acoustic load is about 21dB (A) higher than that at the same position under air acoustic load.