某商用车动力总成悬置系统的优化设计

Optimization design of the commercial vehicle powertrain mounting system

根据某国产商用车悬置系统测量的各项参数,建立动力总成悬置系统6自由度的动力学模型。运用能量解耦原理法及序列二次规划优化算法,以悬置系统各阶固有频率、动力总成质心位移和各悬置元件刚度为约束条件,以振动能量解耦率为优化目标,对动力总成悬置系统进行优化设计。试验结果表明,运用能量解耦法能使悬置系统取得良好的解耦效果,改善悬置系统的隔振性能,提高汽车乘坐舒适性。

Based on the measured parameters of mounting system of a domestic commercial vehicle,the six-freedom dynamic model of powertrain mounting system was established. With the natural frequency of mounting system,the displacement of powertrain centroid and mounting stiffness as the constraint conditions and the decoupling rate of vibration energy as the optimization goal,the principle of energy decoupling method and the sequential quadratic programming optimization algorithm were used to optimize and design powertrain mounting system. The results show that the good decoupling effect is achieved by using the energy decoupling method,which improves the performance of vibration isolation and improves the riding comfort of the vehicle.