非圆化磨耗激励下高速列车转向架区域噪声边频带产生机理及影响

该文通过对车辆噪声和车轮非圆化磨耗开展跟踪测试和分析,发现存在车轮非圆化磨耗的列车在运行过程中,其转向架区域噪声窄带频谱上会出现了以非圆化磨耗激励频率为中心,以过轨枕频率为间隔等间距分布的噪声峰值(即噪声边频带).这使得车轮非圆化磨耗不仅会影响其激励频率处的列车轨道结构的振动和噪声,还会对其他频段的噪声产生重要影响.为...

Mechanism and influence of the modulation sidebands on bogie noise excited by polygonal wear in high-speed train

This paper conducts a detailed investigation into the relationships between high-speed wheel polygonal wear excitation and wheel-rail noise of high-speed trains through extensive field experiments and numerical simulations. In the field experiments, it was observed that the equally distributed wheel-rail noise peaks with the polygonal wear excitation frequency as their center and the sleeper frequency as their interval. These noise peaks around the central frequency are also called modulation sidebands of the wheel-rail noise, which indicates the polygonal wear of the wheel not only greatly influences the wheel-rail noise level at the polygonal wear exciting frequency but also in wide frequency band. The present paper develops a new wheel-rail noise prediction model which combines the vehicle-track coupling dynamics model with the traditional TWINS wheel-rail noise theory and the key factors which influence these equally distributed peaks in the wheel-rail noise are studied. The simulation model could consider the interaction between the wheels and rails under the actual movement of the vehicle at all times. The results show that the mechanism of the sidebands of wheel rail noise is coupling effect of sleeper pass excitation and dynamics stiffness of Hertz spring under excitation of polygonal wear, and the operating speed, the amplitude of polygonal wear, the stiffness of fastener have a significant influence on it. The research results of this paper are helpful to the advancement of wheel-rail noise theory of high-speed trains and the development of wheel-rail noise prediction models.