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Effect of wheel flat on dynamic wheel-rail impact in railway turnouts
Vehicle System Dynamics ( IF 3.6 ) Pub Date : 2021-01-24 , DOI: 10.1080/00423114.2021.1876888
Jingmang Xu 1, 2, 3 , Qiantao Ma 1, 2 , Siqi Zhao 1, 2 , Jiayin Chen 1, 2 , Yao Qian 1, 2 , Rong Chen 1, 2 , Ping Wang 1, 2
Affiliation  

Wheel flat is a form of wheel tread defect that reduces the service life and running safety of trains and tracks. Based on the multi-body system dynamics theory, a rigid-flexible vehicle-turnout dynamic coupling modelwas established, and the wheel diameter-varying flat simulation method used to create wheel flat models of different sizes. The most unfavourable phase of flats on the wheels of a vehicle crossing a turnout was studied by scanning and calculating the phase of the flats. The influence of flat size and vehicle speed on a vehicle with flats crossing a turnout was also analyzed. The results show that, compared with a normal wheel crossing a turnout and a wheel flat acting on the interval rail, a wheel flat acting on the wheel load transition of the frog area will excite greater vertical wheel-rail forces and vertical axle box vibration acceleration; in the turnout area, the main frequency band of the vertical vibration acceleration of the axle box is 550–800 Hz, which is rarely affected by the size of flats or the speed of the vehicle. The third-order bending mode of the wheel is excited when the wheel transits from the wing rail to the point rail.



中文翻译:

车轮平整度对道岔动态轮轨冲击的影响

车轮扁平是一种车轮花纹缺陷,会降低火车和轨道的使用寿命和运行安全性。基于多体系统动力学理论,建立了刚柔车辆-道岔动态耦合模型,采用轮径变平面仿真方法,建立了不同尺寸的车轮平面模型。通过扫描和计算平面的相位,研究了通过道岔的车辆车轮上最不利的平面相位。还分析了平板尺寸和车速对平板穿过道岔的车辆的影响。结果表明,与通过道岔的普通车轮和作用在间隔钢轨上的车轮平面相比,作用于蛙形区车轮载荷过渡的车轮平面将激发更大的垂直轮轨力和垂直轴箱振动加速度;在道岔区,轴箱竖向振动加速度的主要频带为550~800Hz,很少受单位面积大小或车速的影响。当车轮从翼轨过渡到点轨时,车轮的三阶弯曲模态被激发。

更新日期:2021-01-24
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