Transfer Path Test And Analysis Of EMU Noise And Vibration

In recent years, with the rapid development of the industry of China’s high-speed trains, serious pollution of vibration and noise has been brought. EMU noise has certain influence to passenger’s health and comfort.Transfer Path Analysis method can effectively identify noise sources and transmission paths to provide effective direction for the noise control. However, the cross coupling between the transmission paths can lead to the problem of the analysis result of Transfer Path Analysis. In this paper, using Cholesky decomposition and least square method decouple data of the excitation source test, with this test data preprocessing methods to achieve the purpose of eliminating crosstalk between transmission paths. Using the data of crosstalk cancellation performed transfer path analysis in order to optimize the results of the analysis.Then the feasibility and effectiveness of the crosstalk cancellation between the excitation sources are verified by experiments. Through the experiment analysis and comparison, the decoupled excitation source data is more close to the real situation; the Transfer Path Analysis result using the data of crosstalk cancellation is more accurate and it has played a certain role in the optimization; the crosstalk cancellation effect of the real excitation method is superior to the hammer excitation method.Finally, make the analysis of EMU transfer paths and the noise contributions of excitation sources with taking the end noise as the target point. The crosstalk cancellation method applied to calculate the engineering practice of EMU excitation source contribution in solving the calculation result of false peak noise problems. It is more accurate to calculate the noise contribution of the excitation source. The main noise source and transmission path of EMU were found by Transfer Path Analysis method, which provides a theoretical basis for the structural optimization and reduction of vibration and noise.