Electromechanical coupling modelling and nonlinear vibration analysis of an electric vehicle-road system

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (14) : 18-26.

FENG Guizhen1,2,3，LI Shaohua1，ZHAO Wenzhong4

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Abstract

The large unsprung mass of an electric vehicle driven by the hub motor results in the increase of the dynamic tire load.At the same time, the electromagnetic force and torque fluctuation of the motor excite the wheel, and the wheel vibration will further aggravate the vehicle vibration.Accordingly, considering the electromagnetic excitation of the motor, a five degrees of freedom nonlinear mechanical and electrical coupling dynamic model of an electric vehicle road system was established, the expression of the secondary excitation caused by the road vibration was derived, and the influences of the road roughness, the motor excitation and the secondary excitation of the road on the vibration response of the electric vehicle were analyzed.The influences of the vehicle speed and the nonlinear parameters on the vehicle response were also analysed.The results show that the motor excitation has the greatest influence on the dynamic tire load and the vehicle body acceleration by the nonlinear vehicle model, the suspension dynamic deflection and the pitching angle acceleration are the second and the seat acceleration has the smallest influence.Under the comprehensive action of the motor excitation, the vehicle response performance index of the nonlinear model is obviously better than that of the linear model, especially the dynamic tire load is the most evident.Among the nonlinear parameters of the electric vehicle system, the square nonlinear coefficient of the suspension stiffness has the greatest influence on the vehicle response, the asymmetric coefficient of the suspension damping and the nonlinear coefficient of the tire are the second, and the cubic nonlinear coefficient of the suspension stiffness has the least influence.The electromechanical coupling model and research ideas of the electric vehicle road system provide a reference and theoretical support for the dynamic analysis of electric vehicles.

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electric vehicle / electromechanical coupling vibration / nonlinear / secondary road excitation

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FENG Guizhen，LI Shaohua，ZHAO Wenzhong. Electromechanical coupling modelling and nonlinear vibration analysis of an electric vehicle-road system[J]. Journal of Vibration and Shock, 2021, 40(14): 18-26

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