Modeling and control of a quarter-car model with double wishbones and its equivalent two degrees of freedom model

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (10) : 6-14.

ZHU Bolin, QIN Wu, SHANGGUAN Wenbin, Subhash Rakheja

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Abstract

A quarter-car model with a double-wishbone suspension and its corresponding equivalent model which is a two degrees of freedom (2DOFs) system with damping were proposed.Based on the calculated dynamic responses of the quarter-car model with the double-wishbone suspension, the method for identifying the mass, stiffness and damping parameters of the 2DOFs model was developed.The dynamic responses of the 2DOFs model with different values of mass, stiffness and damping were calculated and compared, where one set of mass, stiffness and damping parameters is of nominal values and another set is of the identified values.The influences of the stiffnesses of the bushing and top-mount of the suspension on the identified parameters were investigated.A sliding mode control algorithm based on a reference model with an equivalent 2DOFs model was proposed.The influences of the mass, stiffness and damping parameters in the 2DOFs model on the controlling effect was investigated to demonstrate the importance of the exactness of parameters.

Key words

double-wishbone suspension / parameters identification / rubber bushing / sliding-mode control

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ZHU Bolin, QIN Wu, SHANGGUAN Wenbin, Subhash Rakheja. Modeling and control of a quarter-car model with double wishbones and its equivalent two degrees of freedom model[J]. Journal of Vibration and Shock, 2019, 38(10): 6-14

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