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Novel Fuzzy Disturbance Observer based on Backstepping Method For Nonlinear Systems  

Baek, Jae-Ho (ICS Lab., Dept. of Electrical and Electronic Eng., Yonsei University)
Lee, Hee-Jin (Dept. of Information and Control Eng., Institute for Information Technology Convergence, Hankyung National University)
Park, Mig-Non (ICS Lab., Dept. of Electrical and Electronic Eng., Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.47, no.2, 2010 , pp. 16-24 More about this Journal
Abstract
This paper is proposed a novel fuzzy disturbance observer based on backstepping method for nonlinear systems with unknown disturbance. Using fuzzy logic systems, a fuzzy disturbance observer with the disturbance observation input is introduced for unknown disturbance. To guarantee that the proposed disturbance observer estimates the unknown disturbance, the disturbance observation error dynamic system is employed. Under the framework of the backstepping design, the fuzzy disturbance observer is constructed recursively and an adaptive laws and the disturbance observation input are derived. Numerical examples are given to demonstrate the validity of our proposed disturbance observer for nonlinear systems.
Keywords
Nonlinear systems; Fuzzy systems; disturbance observer; Backstepping; Lyapunov Stability;
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