Research on Sliding Mode Control for Nonlinear Active Suspension System with Two Degrees of Freedom

doi:10.3901/JME.2020.01.058

Abstract

Abstract: Based on the nonlinear model of two degrees of freedom (2DOF), the sliding mode control (SMC) algorithm based on reference sky-hook model for active suspension system is proposed. The effectiveness of the algorithm applied in the nonlinear 2DOF control system of active suspension is validated by the active suspension plant. In the reference sky-hook model and the nonlinear 2DOF control model of active suspension, the displacement and the velocity of sprung mass assumed to be equal by using the control force. The calculation method for control force of active suspension is developed by using the SMC algorithm based on reference sky-hook model. Through the measured acceleration of sprung mass in nonlinear 2DOF model with SMC, the effectiveness of the calculated method for the control force is verified. The method for selecting damping coefficient in reference sky-hook model is proposed. The influence of the selected parameters in reference sky-hook model on the controlling performance of the nonlinear 2DOF control system of active suspension is analyzed. Based on the nonlinear 2DOF suspension model, the performance indexes of active suspension system with SMC and linear quadratic regulator (LQR) control are calculated and compared. It is shown that the nonlinear active suspension control system with SMC based on reference sky-hook model can obtain the better performance indexes.

Key words: nonlinear 2DOF suspension model, SMC algorithm, sky-hook damping, performance indexes

CLC Number:

U463

QIN Wu, SHANGGUAN Wenbin, Lü Hui. Research on Sliding Mode Control for Nonlinear Active Suspension System with Two Degrees of Freedom[J]. Journal of Mechanical Engineering, 2020, 56(1): 58-68.

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