Optimization design for improving the vibration modes decoupling rate and vibration isolation performance of a powertrain mounting system based on the genetic algorithm

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (14) : 248-253.

LU Chihua^1,2,3, LIU Yongchen^1,2, LIU Zhien^1,2, ZHOU Yifan⁴, ZHANG Lei⁴

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Abstract

Aiming at improving the insufficient vibration modes decoupling rate and disappointing vibration performance of the suspended powertrain mounting system in a SUV, a four points suspension 6DOF multibody dynamic model for optimizing the power assembly was established based on the simplification of the rear suspension to two 3directional elastic springs. The three direction stiffnesses of the suspension were taken as optimal variables, and the natural frequencies and modal decoupling rate were taken as optimization objectives in the optimization model. The optimized linear suspension stiffnesses combined with the parameters of original nonlinear stiffness were applied to judge the limiting action of the suspension. The results show that the distribution of different order modal frequencies of the suspension is reasonable, the decoupling rate between Z and Rx directions is highly improved, and the limiting action of the suspension is satisfactory.

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powertrain mounting system / energy decoupling / genetic algorithm / parameter optimization / General 28 condition.

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LU Chihua1,2,3, LIU Yongchen1,2, LIU Zhien1,2, ZHOU Yifan4, ZHANG Lei4. Optimization design for improving the vibration modes decoupling rate and vibration isolation performance of a powertrain mounting system based on the genetic algorithm[J]. Journal of Vibration and Shock, 2018, 37(14): 248-253

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