汽车发动机悬置系统多目标设计优化研究

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。

Multi-object Optimization of Vehicle Engine Mounting Systems

Engine mounting system is very important for automobile vibration and noise control. By considering the coupling factors of body and engine mounting system, a 15-degree model considering coupled vibration between the vehicle body and the engine was proposed. A multi-object optimization concurrently considering both decoupling rate in Torque Roll Axis coordinate system and transferred forces was defined as the objective function. And all of common driving conditions were considered. The particle swarm optimization (PSO) algorithm was used to optimize the mounting stiffness parameters, which used the excitation forces identified as the actual force input. The results show that transferred forces can be reduced effectively by choosing proper parameters of the mounting stiffness and the decoupling rate increases. The comfort of automobile can be improved.