PA030_基于Adams Car的方坑工况动态仿真分析+付文奎(已审阅）.pdfVIP

基于Adams/Car 的方坑工况动态仿真分析 作者：付文奎，刘立刚，舒进 单位：泛亚汽车技术中心有限公司 摘要：基于虚拟路面的载荷预估将替代传统的路面载荷提取法成为获取整车零部件耐久 载荷的重要途径。本文基于Adams/Car 对路谱采集中典型的方坑路面进行了仿真分析，为提 高仿真精度，文中建立了考虑柔性车身的车辆动力学模型，轮胎模型采用适用于高频分析的 柔性环 Ftire 模型。经与试验值对比，仿真结果能对轮心位移及轮胎、悬架受力进行较高精 度的预测，从而在车辆开发前期就能获取最大轮跳行程及车身极限载荷，降低了后期的开发 风险及整车研发成本，也验证了基于虚拟路面的载荷预估方法的可靠性及有效性。 关键词：虚拟路面；载荷预估；方坑路面；最大轮跳；车身极限载荷 Dynamic Simulation Analysis of Pothole Event Based on Adams/Car Abstract ：Virtual Road Load Data Acquisition(vRLDA) is to replace traditional Road Load Data Acquisition thus become the important method to obtain the load for the fatigue analysis of the vehicle components. This paper makes a simulation analysis for pothole based on Adams/Car, a typical loadcase in road load data acquisition. Flex-body is adopted in the full vehicle model in order to improve the simulation accuracy. Flexible ring tire model, ftire, is used for the benefit of valid in higher frequency domain. The result shows that simulation result correlated well in wheel center travel and load of tire and suspension parts. Consequently, it is available to predict the max effective jounce travel and body max load in the early phase of vehicle development thus decrease the potential risk in the late phase and the total research cost. The vRLDA is also proven as a reliable and effective method to obtain the load. Keywords: virtual road; load prediction; pothole; max effective jounce travel; body max load 前言 方坑工况是车辆前期开发及后期耐久试验的重要工况。在前期架构开发中，车辆通过方 坑时的轮跳决定了悬架的最大上跳行程，而最大上跳行程又直接决定了底盘零部件与车身纵 1 梁的间隙，从而会间接影响到悬架的硬点布置 。同时，车辆通过方坑时由于缓冲块已经压 缩到极限，车身会受到一个极限的冲击载荷，这对车身的强度也提出了一定的要求。而在尚 无样车可用的车辆开发前期，使用 CAE 分析手段对车辆过方坑工况进行动态仿真分析，准 确地预测出悬架的最大上跳行程及车身处最大的冲击载荷，则可以有效地为架构开发及零部 件开发提供数据支持，降低了后期的零件干涉及车身强度不够的风险。本文将使用 MSC 多 体动力学软件 Adams/Car 对某款开发车型进行整车建模并进行仿真计算，并与试验结果进 行对比验证。 仿真模