基于动力总成和车身整体的发动机怠速激励下车身振动仿真研究

发布时间：2018-01-01 15:42

本文关键词：基于动力总成和车身整体的发动机怠速激励下车身振动仿真研究　出处：《现代制造工程》2016年02期 　论文类型：期刊论文

【摘要】：综合运用多体动力学、有限元法、动态响应灵敏度分析和结构优化方法,研究基于动力总成和车身整体的发动机怠速激励下车身振动的动态仿真。以某国产客车为研究对象,分别建立十二自由度整车动力学模型和白车身有限元模型。以悬置系统的动载荷为桥梁,将动力学仿真和有限元仿真结合起来,定量求解发动机怠速激励下车身特征点的动态响应。对比分析特征点动态响应的仿真结果与实车测试结果,验证仿真方法的正确性。将此振动仿真方法应用到结构优化中,针对实车上出现怠速工况下VIP座椅位置振动异常问题,以动态响应灵敏度分析为指导,通过对车架和车身底板骨架整体结构局部调整和尺寸优化,提高了客车的乘坐舒适性能。
[Abstract]:Multi-body dynamics, finite element method, dynamic response sensitivity analysis and structural optimization method are used comprehensively. The dynamic simulation of engine vibration under idling excitation based on powertrain and body is studied. A domestic bus is taken as the research object. The dynamic model of the vehicle with 12 degrees of freedom and the finite element model of the white body are established respectively. The dynamic simulation and the finite element simulation are combined with the dynamic load of the mounting system as the bridge. The dynamic response of vehicle body characteristic points under idle speed excitation is solved quantitatively, and the simulation results of the dynamic response of the feature points and the test results of the real vehicle are compared and analyzed. To verify the correctness of the simulation method, the vibration simulation method is applied to the structural optimization, aiming at the abnormal vibration of VIP seat position under idle condition, guided by the dynamic response sensitivity analysis. Through the local adjustment and dimension optimization of the frame and the whole frame of the body floor, the ride comfort performance of the passenger car is improved.
【作者单位】：武汉科技大学汽车与交通工程学院;
【基金】：国家自然科学基金项目(51105283)
【分类号】：U463.82;U467
【正文快照】： 0引言发动机作为主要的振动激励源之一,对客车怠速工况和中小负荷行驶工况下的车身振动特性影响最大。为了降低发动机激励引起的车身振动,通常将动力总成用橡胶软垫支承在车架上,起到隔振作用[1]。在悬置系统设计时,一般采用动力学优化方法,通过建立动力总成系统的六自由度或

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