重型汽车动力总成悬置系统稳健优化设计

Robust Optimization Design of Powertrain Mounting System of Heavy Tractor

目前橡胶悬置仍广泛应用于重型汽车,针对其刚度特性的不确定性,根据能量解耦理论和基于扭矩轴的解耦理论,采用基于σ水平的稳健优化方法对悬置系统进行稳健设计。设计过程中采用多岛遗传算法寻优并运用矩阵法计算响应函数的均值与方差。最后以某悬置系统为例,根据静平衡和弯矩要求确定悬置各向刚度的初始值;按照稳健优化设计流程建立六自由度模型并求解计算。结果表明,应用此方法对悬置系统进行优化能够合理布置固有频率并提高各向解耦率,保证设计目标的鲁棒性,避免系统因刚度差异导致失效的问题。

The rubber mount is still widely used in heavy-duty vehicles until now.Due to uncertainty of its stiffness,6 sigma robust design of powertrain mounting system is adopted to improve the robustness of the system according to the energy decoupling theory and the decoupling theory based on torque axis.The multi-island genetic algorithm is used in the design process;the mean and variance of the response function are calculated by using the matrix method.Taking one system as an example,the intial stiffness of each mount is calculated based on the static equilibrium and torque requirement;a 6 DOFs model is established and optimization is carried out according to the proposed design procedure.The results show that the use of this method can greatly improve the decoupling rate,ensure a high robustness of the goals and avoid failure due to difference of the stiffness.