柔性轮轨下轮轨波磨综合作用的振动特性研究

Research on Vibration Characteristics of Wheel-rail Corrugation under Flexible Wheel and Rail

运用ANSYS联合SIMPACK建立基于柔性轮轨下的某型高速动车组的车辆-轨道耦合振动模型,选取典型的车轮谐波磨耗(20阶,幅值0.01～0.03mm)及钢轨波磨(波长120～150mm,幅值0.01～0.04mm)进行综合分析,对比分析4种模型在不同磨耗下的振动特性。结果表明:模态共振导致柔性体振动幅值大于刚性体振动幅值,而远离模态共振时,柔性体产生的振动幅值小于刚性体振动幅值;考虑轮轨柔性状态时,轮轨非均匀磨耗综合作用产生的轮轨力大于单独考虑轮对或钢轨磨耗时产生的轮轨力;轮轨非均匀磨耗综合作用下产生的轮轨力、轮轨振动加速度随幅值增大而增大,与速度、钢轨波磨波长呈非线性关系;轮轨非均匀磨耗综合作用下,轮对振动加速度及轮轨垂向力呈周期性包络现象。

In this paper, the vehicle track coupling vibration model of a type high speed EMU based on flexible wheel and rail was established by using ANSYS combined with SIMPACK. Typical wheel harmonic wear （20 order, with amplitude of 0.01 to 0.03 mm） and rail corrugations （wavelength： 120 to 150 mm, amplitude： 0.01 to 0.04 mm） were selected to compare and analyze the vibration characteristics of four models under different wear conditions. The results show that modal resonance will cause greater amplitude of vibration of the flexible body than that of the rigid body, while the amplitude of vibration of the flexible body will be smaller than that of rigid body when the modal resonance is far away. Based on the flexible wheel rail state, the wheel rail force produced by the combined effect of wheel rail non uniform wear is greater than the wheel rail force when the wheelset or rail wear is considered alone. The wheel rail vertical force and wheel rail vibration acceleration gen crated by the combined effect of wheel rail non uniform wear increase with the increase of the amplitude, and show a nonlinear relationship with the velocity and the wavelength of rail corrugations. Under the combined effect of wheel rail non uniform wear, the wheel rail vertical force and vibration acceleration of the wheelset are periodically enveloped.