摘要
该文针对重载铁路货车车辆,从大系统角度,研究了蛇形失稳时的轮轨动态相互作用特征,仿真计算了当货车车辆以高于其非线性临界速度运行时的轮轨系统振动姿态。理论分析结果表明,轮对蛇形运动时,轮轨接触点在车轮踏面与轮缘根部交替变化,导致轮轴横向力变化非常剧烈,最大值接近正常值的10倍。在轮轨横向力的作用下,轮对以11.25Hz频率在轨道中心线左右横向运动,幅度达到了15mm,且摇头角位移较大,轮对蛇形运动波长为3.4m;钢轨横向振动也非常明显,将进一步加剧轮对横向运动。另外,轮轨横向相互作用力及钢轨横向振动位移的主频与轮对蛇形频率一致。
Aiming at heavy-haul vehicles, the paper investigates the characteristic of dynamic interaction between wheel and rail due to the hunting motion by considering them in a whole system. On the condition of the vehicle operating speed being a little higher than its nonlinear critical speed, the wheel/rail vibration motion is simulated. In this case, the contact point of the wheel and rail occurs at the wheel tread or the wheel flange periodically, causing a sharp change in the lateral force of wheelset. The maximum lateral force is nearly 10 times larger than the normal value without hunting motion. Due to the existing of that force, the wheel shifts from the left side to the right side with a main frequency of 11.25Hz and a larger yaw angle, and the maximum shift is 15ram, as is called hunting motion with a hunting wave of 3.4m. Meanwhile, the lateral displacement of rail is very obvious, resulting in more serious oscillation of wheelset. It is noticeable that the main frequencies of the lateral force and the rail lateral displacement are consistent with the frequency of hunting motion of the wheel.
出处
《工程力学》
EI
CSCD
北大核心
2012年第1期235-239,共5页
Engineering Mechanics
基金
国家重点实验室自主研究课题项目(2008TPL_T04)
国家高技术发展计划863课题项目(2009AA11Z202)
关键词
蛇形运动
轮轨
相互作用
重载铁路
动力学
hunting motion
wheel and rail
interaction
heavy-haul railway
dynamic