2134/11125
Jun Yang
Jun
Yang
Argyrios C. Zolotas
Argyrios C.
Zolotas
Wen-Hua Chen
Wen-Hua
Chen
Konstantinos Michail
Konstantinos
Michail
Shihua Li
Shihua
Li
Robust control of nonlinear MAGLEV suspension system with mismatched uncertainties via DOBC approach
Loughborough University
2012
‘‘Mismatched” disturbances
Nonlinear MAGLEV suspension system
State-space disturbance observer
Disturbance compensation gain
Engineering not elsewhere classified
2012-12-07 12:46:51
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Robust_control_of_nonlinear_MAGLEV_suspension_system_with_mismatched_uncertainties_via_DOBC_approach/9225761
Robust control of a class of uncertain systems that have disturbances and uncertainties not satisfying “matching” condition is investigated in this paper via a disturbance observer based control (DOBC) approach. In the context of this paper, “matched” disturbances/uncertainties stand for the disturbances/uncertainties entering the system through the same channels as control inputs. By properly designing a disturbance compensation gain, a novel composite controller is proposed to counteract the “mismatched” lumped disturbances from the output channels. The proposed method significantly extends the applicability of the DOBC methods. Rigorous stability analysis of the closed-loop system with the proposed method is established under mild assumptions. The proposed method is applied to a nonlinear MAGnetic LEViation (MAGLEV) suspension system. Simulation shows that compared to the widely used integral control method, the proposed method provides significantly improved disturbance rejection and robustness against load variation.