A novel extended state observer.
A novel extended state observer, which feeds back the output estimation error via both nonlinear and switching terms, is put forward for the first time in this paper. No longer neglecting the lumped uncertainty׳s first time derivative, the problem of disturbance observer design is transformed into the problem of state observer design in the presence of external disturbance. The switching term of the output estimation error is employed to counteract the adverse effect of external disturbance. The newly developed extended state observer provides an attractive solution to the issue of high precision motion control system. Both numerical simulation and experimentation on a speed turntable with temperature box are implemented to verify the performance of the proposed newly developed extended state observer.
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100191, China; Science and Technology on Aircraft Control Laboratory, Beijing University of Aeronautics & Astronautics, Beijing 100191, China. Electronic address: shepinxiong@163.com.
Shaofeng
S
Xiong
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100191, China.
Weihong
W
Wang
Beijing Aerospace Automatic Control Institute, Beijing 100854, China; National Key Laboratory of Science and Technology on Aerospace Intelligence Control, Beijing 100854, China.
Xiaodong
X
Liu
Department of Automation, Nankai University, Tianjin 300071, China.
Zengqiang
Z
Chen
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics & Astronautics, Beijing 100191, China; Science and Technology on Aircraft Control Laboratory, Beijing University of Aeronautics & Astronautics, Beijing 100191, China.
Sen
S
Wang
Disturbance observer; Extended state observer; Finite time convergence; Speed turntable; Switching term