本文提出单点激励多级随机隔振系统的动力敏度分析方法,并用该方法,对国产某重型矿用自卸车的驾驶室和座椅支承系统的物理参数进行了动力优化设计。目标函数是座椅的垂直加速度均方值,还给出一个动力约束条件。计算表明,座椅支承的阻尼值是降低目标函数最敏感的参数。 This paper proposes a dynamic sensitivity analysis method for a single point excitation multi-stage random vibration isolation system, and uses this method to dynamically optimize the physical parameters of the cabin and seat support system of a domestic heavy duty dump truck. The objective function is the vertical acceleration of the seat and gives a dynamic constraint. Calculations show that the damping value of the seat support is the most sensitive parameter to reduce the objective function.