中文摘要：

用多体动力学软件Simpack建立了永磁同步电机直接驱动转向架的车辆系统动力学模型,通过仿真计算来对直接驱动转向架的一系悬挂进行结构选型和参数优选。分析了一系悬挂水平定位刚度与非线性临界速度的关系,得出一系纵、横向定位刚度分别是10 MN/m和6 MN/m,并据此确定了一系悬挂应采用双圈钢弹簧＋三角拉杆的结构形式。针对一系悬挂横向跨距较小的特点,着重分析车辆柔度系数s,得出一系垂向刚度取值为1.2～1.6 MN/m,最后计算了一系弹簧的详细结构参数。

英文摘要：

Vehicle system dynamic models of bogie driven directly by permanent-magnet synchronous motor were established based on SIMPACK. With the simulation calculation, the structure and main parameters were selected for the primary suspension system of direct- drive bogie. The relationship between the non-linear critical speed and horizontal stiffness of the primary suspension system was analyzed, and the vertical and horizontal stiffness was obtained as 10 MN/m and 6 MN/m, which indicated that the primary suspension should apply double-ring steel spring＆ triangular rod structure. According to the short span of the primary suspension system, analysis of vehicle flexibility coefficient was focused on, and the vertical stiffness value of 1.2-1.6 MN/m was obtained, then, spring parameters were finally calculated.