Research For Prediction And Control & Optimization Of Interior Noise In Urban Railway Vehicle

Finite element method and boundary element method have been used to predict and control the noise inside the railway vehicle at low and intermediate frequency. Hereby the results in this essay can be referred for further study on how to control the noise radiation.The main work of this essay are as follows:Firstly, the model of the complicated structure of railway vehicle has been simplified, thereafter the finite element model of the structure body and the dynamic air cavity of railway vehicle was established, then the dynamic characteristic and the cavity mode of railway vehicle body was analyzed.Secondly, according to track spectrum ,the dynamic force spectrum of four supportive points loaded by railway vehicle bogie was analyzed, which was used as excitation and combined with finite element method and boundary element method, the vibration response of carriage and radiation noise of vehicle panel excited by external force. Noise distribution of different area from 30 to 200Hz was displayed. Synchronously, A-weighted total sound pressure level of reference points in the vehicle were calculated and sound pressure distribution of the plane field points were visually displayed as well. The acoustic field distribution of the interior vehicle was analyzed, whose results showed that the field pressure distributed along the symmetry line of vehicle's longitude direction was higher than the each side...