【作者】 钱留华；

【导师】 唐新蓬；

【作者基本信息】 华中科技大学 ， 车辆工程， 2005， 硕士

【摘要】 汽车动力总成是汽车的主要振动激励源之一,对汽车的乘坐舒适性有很大的影响。设计合理的汽车动力总成悬置系统可以明显地降低汽车动力总成和车体的振动,不但可以改善汽车的乘坐舒适性,而且还可以延长发动机与其它部件的使用寿命。本文基于多体动力学理论及振动理论,根据实际模型的质量参数、几何参数等通过三维CAD软件Unigraphics建立了动力总成及其悬置系统的实体模型,使用Parasolid接口,应用ADAMS/view 和ADAMS/vibration 及软件,建立了商务车EQ3242 动力总成及其悬置系统的多刚体动力学模型。并在怠速、最大扭矩和额定等三种典型工况下对此模型分别进行时域和频域的仿真,分析了此模型在三种典型工况下的隔振性能。并利用实际样车的改进前后的数据对本文建模和仿真分析的方法进行了验证。为了获得悬置系统最优的隔振性能,建立了悬置系统的参数化模型,选取悬置的刚度为设计变量,悬置支撑处响应力振幅最小为目标函数,动力总成绕滚动轴角加速度的大小为参考性能,对动力总成悬置系统进行优化仿真,优化前后的性能比较显示,优化后悬置系统隔振性能明显改善。并通过优化前后动力总成的角振动以及动力总成与车架结合处标志点垂直振动的大小的比较来验证了,降低悬置支撑处响应力幅值对提高悬置系统隔振效果的显著作用。更多还原

【Abstract】 Automobile power-plant causes the engine vibration which often makes passenger uncomfortable. Proper design of powerplant mounting system can improve the riding comfort as well as extend the age of the engine and other components by remarkably suppressing the vibration. Based on Multi-Body Dynamic theory and vibration theory, this thesis applies software ADAMS/View & ADAMS/Vibration, Unigraphics to build the rigid dynamic model according to the mass parameters and geometry position parameters of each component in real model. Based on the model, the vibration isolation performance of the mounting system was simulated in the three typical conditions both in time domain and in frequency domain. And the performance curves were get. The data of before improved and of after improved of real Automobile was used to validate the method of building model and perform simulation tell in this paper. In order to gain the best vibration isolating characteristic of suspension system, parameter model of mount system is established, the stiffness of mount is chosen to be design variable and the least magnitude of the response force in the supported area of mounting system is chose to be target of mount design, besides, the optimization simulation is made and the performance of vibration isolation of the optimized mounting system is improved. The magnitude comparison of angle-vibration of power-plant and the magnitude comparison of vertical-vibration of the marker in the joint between power-plant and chassis is used to validate that the notable effect of he magnitude reduction the response force in the supported area of mounting system to improve vibration isolation of mounting system。更多还原