Nonlinear control for a class of hydraulic servo system.
The dynamics of hydraulic systems are highly nonlinear and the system may be subjected to non-smooth and discontinuous nonlinearities due to directional change of valve opening, friction, etc. Aside from the nonlinear nature of hydraulic dynamics, hydraulic servo systems also have large extent of model uncertainties. To address these challenging issues, a robust state-feedback controller is designed by employing backstepping design technique such that the system output tracks a given signal arbitrarily well, and all signals in the closed-loop system remain bounded. Moreover, a relevant disturbance attenuation inequality is satisfied by the closed-loop signals. Compared with previously proposed robust controllers, this paper's robust controller based on backstepping recursive design method is easier to design, and is more suitable for implementation.
Yu
Hong
H
School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China. mailyu@sina.com.
Feng
Zheng-jin
ZJ
Wang
Xu-yong
XY
D000465:Algorithms; D003198:Computer Simulation; D005246:Feedback; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012212:Rheology / Q000295:instrumentation* / Q000379:methods*; D013598:Systems Theory