城市轨道交通车辆轮轨系统噪声辐射分析

采用轮轨噪声预测软件(TWINS模型),研究了某城市轨道交通车辆轮轨系统的振动与声辐射特性,分析了引起系统振动和声辐射的主要原因。研究结果表明:R模态为轴向模态,会导致车轮沿轴向的大幅振动;车轮和钢轨的辐射声功率随着速度的增加而增加,钢轨辐射声功率显著大于车轮的声辐射功率;隧道状态下的声学相应显著大于自由场状态下声学相应,底架区域自由场和隧道状态下的声学相应差异不大。

Noise Radiation Characteristics of Urban Rail Vehicle Wheel/Rail System

Based on TWINS theory,the vibration and sound radiation characteristics of the wheel/rail system of a certain urban rail transit vehicle are studied,the main factors causing the system vibration and sound radiation characteristics are analyzed. The research result shows that when the R mode is adopted as the axial mode,it will cause the wheel to vibrate substantially in the axial direction;the radiated sound power of wheel and rail will increase with the increase of speed,and the rail radiated sound power is significantly greater than wheel radiated sound power. While in tunnel state, the acoustic response is significantly greater than that in free field state,but there is little difference between the free field in the underframe area and the acoustic response.