基于整车模型的悬置系统隔振性能分析及优化

Isolation performance analysis and optimization of powertrain mounting system based on full vehicle model

针对现有动力总成悬置系统忽略车身质量、悬架刚度阻尼、轮胎刚度等因素影响的不足之处,建立基于整车模型的动力总成悬置系统9自由度模型,对悬置系统进行隔振性能的理论分析和仿真.在此基础上,直接以悬置处的加速度均方根值最小为目标函数,并以悬置处的振动响应作为隔振效果的评价标准对悬置系统进行优化,以改进动力总成系统的NVH性能.仿真结果表明,基于整车模型建立的发动机悬置系统更加符合实际情况,优化后的结构参数将有效提高悬置系统的隔振性能,改善乘坐的舒适性.

According to the inadequacies of the existing powertrain mounting system ignoring the impacts of body mass,suspension stiffness damping,tire stiffness,and other factors,a nine-degree-of-freedom model of the powertrain mounting system based on complete vehicle is established,and theoretical analysis and simulation are made.On this basis,taking the minimization of acceleration responses as objective function,the powertrain mounting system is optimized to improve the NVH performance.Simulation results indicate that the engine mounting system established based on a full vehicle model is tally with the actual situation,the isolation performance of the suspension system is improved effectively,and the ride comfort is better for the optimized structural parameters.