Decoupling optimisation of 12-degree-of-freedom mount system Online publication date: Fri, 16-Sep-2022
by Zhihong Lin; Dezhao Lin; Di Gong; Yunxiao Chen; Mingzhong Wu
International Journal of Vehicle Noise and Vibration (IJVNV), Vol. 18, No. 1/2, 2022
Abstract: To solve the vibration problem caused by the coupling of the powertrain and the mount system composed of the vehicle frame, the 12-degree-of-freedom mount system is used as the research object. Firstly, the natural frequency, decoupling rate and powertrain displacement response of the 6 and 12 degrees of freedom mount systems are solved. Secondly, the spectral radius of the coupling matrix of the 12-degree-of-freedom mount system is solved. The coupling matrix is shown to converge, and the vehicle frame centre-of-mass displacement response equation is solved by the coupling matrix without considering the road excitation. Finally, a multi-objective genetic algorithm is used to optimise the mount system with the maximum decoupling rate and the minimum vehicle centre-of-mass displacement response as the optimisation objectives. The numerical values show that the decoupling optimisation method better solves the coupling problem of the mount system and decreases the powertrain and vehicle frame displacement vibration response.
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