Title: Mixed H2/H control for electromagnetic active suspension

Authors: Jianyong Cao; Yu Fan; Yongchao Zhang

Addresses: School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China ' School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China ' School of Mechanical Engineering, Taizhou University, Taizhou, Zhejiang Province 318000, China

Abstract: This paper presents a mixed H2/H control strategy under main/torque-tracking loop structure for an electromagnetic active suspension. First, the modelling of the electromagnetic actuator is conducted. Then, the main/torque-tracking loop structure is proposed, in which the main loop calculates the demand torque for electromagnetic actuators based on a full-car suspension model, using mixed H2/H control strategy. Body acceleration, suspension working space, dynamic tyre displacement and demand torque are considered as H2 performance indices, and suspension working space and demand torque are also H performance indices. The torque-tracking loop applies hysteresis current control for electromagnetic actuators to track the demand torque calculated by the main loop. Finally, simulation results demonstrate that the designed controller can greatly improve ride comfort and is less conservative than H controller. The effects of parameter perturbations and dynamic response of suspension system are also studied, indicating that good robustness can be achieved.

Keywords: active suspension; multi-objective control; electromagnetic actuators; robust control; mixed H2/H-infinity; H2; H-infinity; modelling; demand torque; full-car suspension model; vehicle suspension; controller design; body acceleration; suspension working space; dynamic tyre displacement.

DOI: 10.1504/IJVAS.2014.060073

International Journal of Vehicle Autonomous Systems, 2014 Vol.12 No.2, pp.93 - 115

Available online: 26 Mar 2014 *

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