动力总成悬置系统对于汽车振动与噪声控制十分重要,通过考虑车身耦合因素,建立动力总成悬置系统十五自由度耦合模型,以扭矩轴解耦率和总传递振动力为综合优化目标进行优化,并将整车常用行驶工况考虑在内,以整车实测数据辨识出发动机激振力作为系统实际输入,应用粒子群算法对悬置系统刚度参数进行优化.计算表明选择合适的刚度参数可以有效降低汽车的传递振动力,并提高扭矩轴解耦率,从而改善汽车乘坐的舒适性.%Engine mounting system is very important for automobile vibration and noise control. In this paper, a 15-DOF vehicle's body and the powertrain mounting system coupled model is established. With the decoupling rate of the torque shaft and the total transferred vibration force as the objective functions, the whole vehicle structure is optimized considering the common driving conditions. The particle swarm optimization (PSO) algorithm is used to optimize the mounting stiffness parameters with the use of the identified excitation forces as the actual force input. The results show that choosing proper stiffness parameters of the mounting system can effectively reduce the transferred vibration force and increase the decoupling rate of the torque shaft so that the comfort of the automobiles can be improved.
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