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Mathematical Problems in Engineering
Volume 2013, Article ID 913538, 8 pages
Research Article

A Compound Fuzzy Disturbance Observer Based on Sliding Modes and Its Application on Flight Simulator

1School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
2Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Jilin 130033, China

Received 2 December 2012; Accepted 28 January 2013

Academic Editor: Peng Shi

Copyright © 2013 Yunjie Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A compound fuzzy disturbance observer based on sliding modes is developed, and its application on flight simulator is presented. Fuzzy disturbance observer (FDO) is an effective method in nonlinear control. However, traditional FDO is confined to monitor dynamic disturbance, and the frequency bandwidth of the system is restricted. Sliding mode control (SMC) compensates the high-frequency component of disturbance while it is limited by the chattering phenomenon. The proposed method uses the sliding mode technique to deal with the uncompensated dynamic equivalent disturbance. The switching gain of sliding mode control designed according to the error of disturbance estimation is a small value. Therefore, the proposal also helps to decrease the chattering. The validity of the proposal method is confirmed by experiments on flight simulator.