轮对两侧圆周相异轮廓对轮轨动态响应的影响

The influence of different circumferential contours on both sides of wheelset on the dynamic response of wheel/rail

既有车轮多边形问题研究中,通常将同一轮对两侧车轮圆周视为相同轮廓,然而现场实测发现,同一轮对两侧车轮圆周在整个镟修周期内常处于相异状态。结合实测数据对轮对两侧车轮圆周状态进行归类划分;建立车辆‑轨道耦合系统动力学模型,分析轮对两侧车轮圆周状态对轮轨动态响应的影响。结果表明,依据实测数据和离散傅里叶变换结果,理论上将轮对两侧车轮圆周状态分为同阶同幅、同阶异幅、异阶同幅、异阶异幅和单侧非圆;轮对两侧车轮之间的相互作用对轮轨接触特性影响微弱,对轮轨蠕滑特性影响较为明显,对轮轨磨耗的影响显著;同阶状态导致车轮圆周磨耗以整倍阶次发展,异阶状态导致车轮圆周磨耗出现多个显著阶次,包括自身阶次、另一侧车轮阶次、两侧车轮阶次之和以及高阶次的整倍数阶次。结果可为高速列车车轮多边形形成机理的探究提供参考。

In the existing research on the problem of wheel polygon,the circumference of the wheels on both sides of the same wheelset is usually regarded as the same profile.However,the field measurement shows that the circumference of the wheels on both sides of the same wheelset is often in a different state during the whole repair cycle.In view of this,combined with the measured data,the circumferential states of the wheels on both sides of the wheelset are classified.The dynamic model of the vehicletrack coupling system is established,and the influence of the circumferential state of the wheels on both sides of wheelsets on the wheel-rail dynamic response is analyzed.The results show that,according to the measured data and the results of discrete Fourier transform,the circumferential states of wheels on both sides of the wheelset are theoretically divided into the same order with the same amplitude,the same order with different amplitude,the different order with the same amplitude,the different order with different amplitude and the one-sided non-circle.The interaction between the wheels on both sides of the wheelset has a weak effect on the wheel-rail contact characteristics,but an obvious effect on the wheel-rail creep characteristics,a significant effect on the wheel-rail wear.The same order state leads to an integer order development of wheel circumferential wear,and the different order state leads to several significant orders of wheel circumferential wear,including its own order,the order of the other side of the wheel,the sum of the orders of both sides of the wheel and the integer order of higher order.The results can provide a reference for the study of the formation mechanism of wheel polygons in high-speed trains.