Influence of Subway LIM Train Wheel Polygonization on the Vibration and Sound Radiation Characteristics of It

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Influence of Subway LIM Train Wheel Polygonization on the Vibration and Sound Radiation Characteristics of It

Fang, J. Y. / Xiao, X. B. / Wu, L. / Jin, X. S.

Summary This paper presents a combined FEM-BEM acoustic prediction model to calculate the effect of polygonal wheels on the vibration and sound radiation of subway LIM train wheel. In the analysis procedure a three-dimensional model for the wheel is firstly put forward and the “Block Landzos” method is used to calculate the natural frequencies of the wheel. Secondly the method of modal superposition is used to determine the dynamical response of the wheel to the vertical excitation of the running surface roughness. Finally the velocity response of the wheel boundary is treated as the boundary input of the boundary model of the wheel sound radiation which calculates the sound radiation of the wheel. The numerical analysis considers the effect of the excitation of the polygonal wheels at the different wear stages on the vibration and acoustic radiation characteristics of the wheels, in which the data regarding the polygonal wear of the wheels are from the site measurements. The numerical results obtained show that the polygonal wheels have a significant influence on the wheel noise radiation. They can provide the important references in the design of the measures against rolling noise at the source by maintaining the surface conditions of the wheel and rail.