Based on orthogonal experiments, sensitivity analysis of an engine's mounting system is made to show the influence of the mounting locations on the sixth-order natural frequency and vibration decoupling rate. The mounting coordinates parameters determined by the natural frequency and main vibration coupling are analyzed and identified. The calculation shows that the change of the natural frequency and decoupling rate depends on several mounting coordinate parameters, and the coordinates of the right and back mountings play an important role. The experiment results provide a theoretical basis for the decoupling layout and robust design. This method can be employed for sensitivity analysis of discrete, non-differential or implicit-expression structures, and is of great significance for optimization design of these structures.%采用正交试验的灵敏度分析方法,以某款车型的动力总成悬置系统为例,计算动力总成悬置系统6阶固有频率和振动解耦率对悬置位置坐标参数的灵敏度,分析并识别出对悬置系统固有频率和主要方向振动耦合影响较大的悬置坐标参数.计算结果表明,悬置系统固有频率和解耦率的变化是多个悬置位置坐标参数共同作用的结果,该车型右悬置和后悬置的位置坐标参数对动力总成悬置系统六阶固有频率和解耦率影响较大.该方法为动力总成悬置系统的解耦布置、鲁棒设计提供参考.同时,基于正交试验的灵敏度分析方法不依赖于优化算法,可适用于离散、不可微或者隐式表达式的结构的灵敏度分析,对于此类问题的优化设计也具有一定意义.
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