Direct Adaptive Fuzzy Sliding Mode Control for Under-actuated Uncertain Systems

Title & Authors
Direct Adaptive Fuzzy Sliding Mode Control for Under-actuated Uncertain Systems
Su, Shun-Feng; Hsueh, Yao-Chu; Tseng, Cio-Ping; Chen, Song-Shyong; Lin, Yu-San;

Abstract
The development of the control algorithms for under-actuated systems is important. Decoupled sliding mode control has been successfully employed to control under-actuated systems in a decoupling manner with the use of sliding mode control. However, in such a control scheme, the system functions must be known. If there are uncertainties in those functions, the control performance may not be satisfactory.In this paper, the direct adaptive fuzzy sliding mode control is employed to control a class of under-actuated uncertain systems which can be regarded as a combination of several subsystems with one same control input. By using the hierarchical sliding control approach, a sliding control law is derived so as to make every subsystem stabilized at the same time. But, since the system considered is assumed to be uncertain, the sliding control law cannot be readily facilitated. Therefore, in the study, based on Lyapunov stable theory a fuzzy compensator is proposed to approximate the uncertain part of the sliding control law. From those simulations, it can be concluded that the proposed compensator can indeed cope with system uncertainties. Besides, it can be found that the proposed compensator also provide good robustness properties.
Keywords
Adaptive fuzzy control;Under-actuated systems;Sliding mode control;
Language
English
Cited by
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