中文摘要：

由于传统的悬置优化设计一般不考虑发动机载荷以及系统阻尼,不能反映磁流变悬置的半自动控制特性。因此,选取具有代表性的车用直列式4缸4冲程发动机悬置系统的振动力学模型,利用遗传优化算法建立一种磁流变液阻尼器初始刚度优化的新方法。该方法使磁流变液悬置在发动机多种转速下有更优秀的传递率,在冲击载荷下满足安全要求的发动机振动烈度。

英文摘要：

As important tool for engine semi-automatic isolation system,the magneto-rheological fluids（MRC） can＇t achieve tunable stiffness but damping.Therefore,the MRC＇s initial stiffness affects the performance of isolation system.To obtain the better isolation effect of MRC in wide frequency,it is necessary to optimize the initial stiffness.As motor unbalanced force and isolation damping are not considered in traditional mount optimization,the feature of semi-automatic control can not be reflected.For a four-cylinder four-cycle in-line diesel engine,a new method which is suitable for stiffness optimization on vehicle engine isolation is presented by using Genetic Algorithm.The optimal isolation system has small absolute force transmissibility in abroad frequency range and small vibration intensity with impact load by using the new method.