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Vol. 172, Issue 6, June 2014, pp. 229-234




Direct Adaptive Fuzzy Variable Structure Control Design without Sliding Mode for Nonlinear Systems
with Unmatched Disturbances

Xiaoyu Zhang

North China Institute of Science and Technology, Yanjiao 206#, East Beijing, 101601, China
Tel.: +86-10-61591487, fax: +86-10-61591487

E-mail: ysuzxy@aliyun.com


Received: 11 April 20014 /Accepted: 30 May 2014 /Published: 30 June 2014

Digital Sensors and Sensor Sysstems


Abstract: Fuzzy adaptive sliding mode control method is a good way to resolve the control problem when the system mathematic model is unknown. However, reaching condition must be satisfied in this method. In this paper, a kind of fuzzy adaptive variable structure control method is presented in which sliding mode doesn’t exist in closed-loop system. Dynamic fuzzy logical system (DFLS) is introduced to form the variable structure controller (VSC) which parameters are self-tuned on- line. Then the stability of the closed-loop system is proved by using Lyapunov stability theories. The switching logic of the VSC is not determined by the sliding mode defined directly, and the reaching condition of the sliding mode is not required anymore. Robustness, chattering free and adaptive character can be obtained. Finally, simulation results on inverted pendulum are proposed to confirm the performance under perturbations.


Keywords: Sliding mode, Fuzzy, Adaptive, Variable structure control.


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