低速磁浮车辆动力学建模与导向机构仿真分析

Dynamics modeling of low-speed maglev vehicle system and simulation of its guidance mechanisms

在分析低速磁浮车辆结构及其运动学关系基础上,利用SIMPACK软件,建立了含主动悬浮控制的76个自由度的磁浮车辆虚拟样机模型,开展了基于整车动力学的低速磁浮车辆导向机构仿真分析,研究了T形臂、横向滑台及两者之间的运动学规律。仿真结果表明:在300 m半径曲线和三转向架结构条件下,为了保证磁浮车辆顺利通过曲线,磁浮车辆导向机构前T形臂长度应大于后T形臂长度,两者比值的优化区域在1.50和2.00之间;车辆头尾T形臂相对于车体的转角幅值大小基本相同,方向相反,对应滑台的横向位移曲线形状与幅值基本相同;同一转向架前后滑台的最大横移量之比等于前后T形臂长度之比。

Low-speed maglev vehicle structures and their kinematic relationship were analyzed, a 76-DOFs virtual prototype model with active levitation control was developed by SIMPACK software, the numerical simulation of guidance mechanisms was carried out based on the model, and the kinematic rules of T-shape arm and lateral skid platform and their relationship were studied. Aiming at 300 m-radius curve and three-bogies maglev vehicle, simulation result shows that the length of frontal T-shape arm of guidance mechanism should be greater than that of the rear one, and their optimum ratio ranges from 1.50 to 2.00 in order to obtain better curve negotiation performances of low-speed maglev vehicle; the yawing amplitude of head T-shape arm relative to carbody is almost equal to that of tail T-shape arm, while their directions are opposite, and the lateral displacement responses of corresponding skids have similar curves and approximate amplitudes; the amplitude ratio of the lateral displacement of frontal skid to rear skid in the same bogie equals the length ratio of corresponding T-shape arms.