汽车动力总成悬置系统隔振特性仿真优化

摘要

为解决汽车动力总成悬置系统隔振问题,建立动力总成悬置系统6自由度分析模型,对影响悬置系统隔振效果的关键参数进行分析.根据悬置系统固有特性计算理论,利用ADAMS软件对某动力总成悬置仿真模型进行固有特性分析,得到系统固有频率和能量解耦率;然后运用MATLAB中的优化函数以系统能量解耦率为目标,以悬置元件的主轴刚度为优化变量对悬置系统进行优化.通过优化设计,改进后悬置系统隔振率有了明显上升,并且提高了悬置系统的减震性能.调整悬置元件各主轴刚度,可以降低动力总成悬置系统的振动耦合,提高系统的解耦率,实现固有频率的合理配置.%In order to solve the problem of vibration isolation in vehicle powertrain mounting system,the 6 degree of freedom analysis model of powertrain mounting system was established.The key parameters that affected the vibration isolation were analyzed.According to the calculation theory of inherent characteristics of mounting system,dynamics simulation model was established with ADAMS software and inherent characteristics was analyzed with MATLAB to get the system frequency and energy decoupling rate.And then,taking the energy decoupling rate as the goal,the spindle mounting stiffness as the optimization variable,the mounting system was optimized with the optimization function in MATLAB.The results showed that he improved mounting system vibration isolation rate had increased significantly,and the isolation performance had been improved.Adjusting the spindle mounting stiffness can reduce the vibration coupling of the powertrain mounting system,improve the decoupling rate and realize the reasonable configuration of the inherent frequency.