Analysis And Simulation Of Radiate Noise Of The Track Vehicles' Bodywork Structure Based On The Statistical Energy Analysis

With increase of speed of the train passenger, the noise of the interior of the track vehicles is increasing, too. This paper chose the compartment as platform, use statistical energy theory and method, simulate compartment's acoustics and structural dynamics model and forecast the interior acoustic environment of compartment.Firstly, a systematic study of lots of paper is made,developing history and recent status home and abroad of statistical energy analysis are introduced. The study of fundamental assumption, application scope and model of two-subsystem and multiple-subsystem of statistical energy analysis are made. Then general procedure of statistical energy analysis is introduced.Secondly, the knowledge about noise is introduced, simply introduce the definition of the noise, and the terminologies about the noise in the reducing vibration and noise, discuss the category and harm for the environment and human of the noise with these knowledge. At the same time, introduce the noise assessment and the generic way of noise control.Thirdly, analyze the way of reducing noise, and choose the stiffened plate to study to achieve reducing noise. The stiffened plate is the better way in the reducing noise based on the statistical energy analysis in the engineering object. Here the study of the stiffened plate is made, and study the position of the stiffeners and the geometrical shape of the stiffeners in the plate which is better in the reducing the vibration and noise. The result is the position which the excitation must through the stiffener is better, and the trough stiffener having better effect under the synthesized target.Finally, the model of the track vehicles` bodywork structure is established, and then based on the model simulate and predict the noise level of the interior of the track vehicles, obtain the noise level of the model and the way to affect the interior noise of the track vehicles. At the same time apply the previous result——about the position and the geometry shape of the stiffeners in the model that established, then simulate and predict, compare the result with the former,know that the stiffened plate can efficiently reduce the noise level of the track vehicles. At last some measurement to reduce the noise is suggested,such as increasing plates'thickness and choosing material with large damping loss factor.