轮轨纵向几何不平顺对直线电机地铁车辆动态行为的影响
Effect of Longitudinal Geometric Irregularities of Wheel and Rail on Dynamic Behavior of Metro Vehicle Driven by Linear Motor

摘要： 为研究直线电机地铁车辆系统在轮轨几何不平顺激振作用下的动态行为,基于车辆-轨道系统耦合理论,建立了考虑直线电机子系统的地铁车辆-轨道耦合系统动力学模型.应用该模型研究了车轮非圆化、钢轨焊接接头几何不平顺以及钢轨波磨对车辆和直线电机系统的振动响应、轮轨作用力及车辆稳定性等特性的影响.研究结果表明,几何不平顺中长波(大于1 m)影响气隙波动,短波(小于1 m)造成轮轨剧烈冲击振动,需特别注意钢轨焊接接头,其可使轮轨作用力增大1.5倍,气隙降低2~3 mm,轮轨甚至发生分离.
Abstract: A metro vehicle-track coupling dynamic model was established to investigate the effect of geometric irregularities of wheel and rail on the dynamic behavior of linear motor vehicles, which was based on the vehicle-track coupling theory and took the linear induction motor subsystem into account. Through this model, the effect of geometric irregularities, including out-of-round wheel profiles, rail welding joints and rail corrugations, on the vehicle dynamic responses, wheel-rail forces and carbody stability were studied. The results indicates that long wavelength (more than 1 m) irregularities would change the air gap and short wavelength (less than 1 m) ones would cause fierce wheel-rail impact vibration. In addition, it should be noted especially that welding joints could cause a 1.5 times wheel-rail force increase, a 2-3 mm air gap decrease, and even wheel-rail separation