Title :
Mixed H2/H∞ control & μ analysis of vehicle active suspension system
Author :
Fang, Min ; Wang, Ying ; Chen, Wuwei
Author_Institution :
Sch. of Electr. Eng. & Autom., Hefei Univ. of Technol., China
Abstract :
A state-space model was built for 4 degree-of-freedom vehicle active suspension systems. Under the road disturbance excitations, mixed H2/H∞ optimal controller was designed to improve the ride comfort of the vehicle. H2 index was used to make the system have good time-domain LQR performance, while H∞ index was used to overcome the unmodeled dynamic uncertainties. The mixed H2/H∞ optimal controller was obtained based on linear matrix inequalities (LMI). Structured singular value theory was used to analyze robust stability of the system. The results of the simulation in MATLAB show that, compared with the passive suspension system, the active suspension systems effectively suppress the vehicle´s vibration in the range of sensitive frequencies of human body, and improve the ride comfort. At the same time the active suspension systems have strong robustness.
Keywords :
H∞ control; control system analysis; control system synthesis; digital simulation; linear matrix inequalities; linear quadratic control; road vehicles; robust control; singular value decomposition; state-space methods; suspensions (mechanical components); vibration control; μ analysis; 4 degree of freedom; LMI; MATLAB simulation; linear matrix inequalities; mixed H2/H∞ control; optimal controller design; robust stability analysis; robustness; singular value theory; state space model; time domain linear quadratic regulator; vehicle active suspension system; vibration suppression; Biological system modeling; Linear matrix inequalities; MATLAB; Mathematical model; Optimal control; Road vehicles; Robust stability; Time domain analysis; Uncertainty; Vehicle dynamics;
Conference_Titel :
Intelligent Control and Automation, 2004. WCICA 2004. Fifth World Congress on
Print_ISBN :
0-7803-8273-0
DOI :
10.1109/WCICA.2004.1340680
