An optimal design for suspension based on LQG control

摘要

This research presents systematically an optimal design for the suspension based on LQG control to improve vehicle ride comfort and reduce manufacturing & using costs. The novelty lies in revealing that the optimized LQG control suspension is just a semi-active one. Based on quarter-vehicle model, investigation to the influences of suspension stiffness & basal damp on suspension performance and global damping characteristics of control force shows that the performance of LQG control active suspension is nothing to do with suspension stiffness & basal damp and the global damping characteristics of control force becomes obviously negative from obviously positive with basal damp increasing regardless of suspension stiffness. Suspension performance and manufacturing & using costs are considered comprehensively during optimizing the LQG control suspension. The optimization result shows that the optimized semi-active suspension based on LQG control has excellent comfort ride and low manufacturing & using costs.