On improvement of transient performance in tracking control for a class of nonlinear systems with input saturation |
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Authors: | Weiyao Lan Ben M Chen Yingjie He |
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Affiliation: | Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore |
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Abstract: | This paper studies the technique of the composite nonlinear feedback (CNF) control for a class of cascade nonlinear systems with input saturation. The objective of this paper is to improve the transient performance of the closed-loop system by designing a CNF control law such that the output of the system tracks a step input rapidly with small overshoot and at the same time maintains the stability of the whole cascade system. The CNF control law consists of a linear feedback control law and a nonlinear feedback control law. The linear feedback law is designed to yield a closed-loop system with a small damping ratio for a quick response, while the nonlinear feedback law is used to increase the damping ratio of the closed-loop system when the system output approaches the target reference to reduce the overshoot. The result has been successfully demonstrated by numerical and application examples including a flight control system for a fighter aircraft. |
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Keywords: | Composite nonlinear feedback control Nonlinear systems Input saturation Tracking control Control applications |
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