动力总成悬置系统隔振性能参数优化

Parameters Optimization of Vibration Isolation Performance of Power-train Mounting System

为提高悬置系统的隔振性能,基于隔振原理,分别建立6自由度动力总成悬置模型和包括车架的12自由度整车模型。以各悬置元件的刚度为设计变量、悬置元件的变形量为约束条件、悬置支撑处响应力最小为优化目标,采用序列二次规划法对6自由度悬置模型进行参数优化并获得系统的最优刚度值。基于12自由度整车模型,分别对优化前后系统的隔振传递率进行比较,优化后的隔振传递率最大降低了7.4%,改善了整车的NVH特性。

In order to improve the isolation performance of the mounting system,a 6-DOF model of a power-train mounting system and a 12-DOF whole vehicle model including the vehicle frame were built based on the mechanism of vibration isolation. The mount stiffness was defined as the design variables,the deformations of mounts were defined as constraint conditions,the minimum response forces on the mounting support were defined as the objective function. Using sequential quadratic programming,the parameters optimization was executed for a 6-DOF mounting model,and the optimum stiffness values of mounts were obtained. Comparing the optimized isolation transmissibility with the original based on the 12-DOF whole vehicle model,the optimized isolation transmissibility is reduced by about7. 4%,and the NVH performance of whole vehicle is improved.