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铁路车轮的周期性非圆化将引起车辆-轨道耦合系统一系列动力响应的变化,对系统的各个部件都有着危害性的影响。为保证此方面的行车安全和稳定,提高铁路运输维护维修的经济效益,需要制定规范,确定车轮非圆化的允许范围,及时对非圆化车轮进行检测、更换和镟修。研究了车轮二阶周期性非圆化——椭圆化,建立了一个新的模拟车轮椭圆化的数学模型,结合车辆-轨道空间耦合动力学模型,计算了左右车轮不同相位和车轮椭圆度下,车体的横向、垂向位移,钢轨横向、垂向振动加速度,并与传统模型计算结果作了对比,分析表明两种模型的动力响应变化规律和频率一致,但横向动力响应幅值和相位均存在不同程度不可忽略的差异,因此传统的轨道几何不平顺激励模型不能真实模拟车轮的周期性椭圆化对车辆-轨道耦合动态行为的影响,本文模型更能反映实际椭圆车轮与钢轨接触情形,计算方法准确而合理。
Periodic non-rounding of the railway wheels will cause a series of dynamic response changes of the vehicle-track coupling system, which will have harmful effects on all parts of the system. In order to ensure the traffic safety and stability in this respect and improve the economic benefits of railway transportation maintenance and repair, it is necessary to formulate norms, determine the allowable range of wheel non-rounding, and timely detect, replace and repair non-round wheels. The second round of periodic non-rounding-ovalization of the wheel was studied. A new mathematical model of elliptical ellipticity was established. Combining with the vehicle-orbit coupling dynamics model, The horizontal and vertical displacements of the car body, the horizontal and vertical vibration acceleration of the rail are compared with those of the traditional model. The results show that the dynamic response and frequency of the two models are the same, but the amplitude and phase of the lateral dynamic response Therefore, the traditional orbit geometric irregularity excitation model can not truly simulate the influence of the periodic ellipticity of the wheel on the dynamic behavior of the vehicle-track coupling. This model can better reflect the actual situation of elliptical wheel and rail contact, calculate The method is accurate and reasonable.