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Nonlinear sliding surface based second order sliding mode controller for uncertain linear systems
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DOI：10.1016/j.cnsns.2010.12.020.png)
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A second order sliding mode (SOSM) controller using nonlinear sliding surface is proposed in this paper. The aim of the proposed controller is to guarantee stability as well as enhance the transient performance of uncertain linear systems with parametric uncertainty. The nonlinear sliding surface consists of a linear term and a nonlinear term. The linear term comprises a gain matrix which has a very low value of damping ratio and thereby facilitates fast response. The nonlinear term is introduced to accommodate a variable damping ratio to reduce overshoot and settling time of the closed loop system as the output reaches nearer the desired reference position. A major gain of the proposed SOSM controller is the elimination of chattering in the control input. The proposed nonlinear sliding surface based SOSM controller achieves fast rise, low overshoot and low settling time. simulation results demonstrate the effectiveness of the proposed SOSM controller. (C) 2010 Elsevier B.V. All rights reserved.
Keyword:
Second order sliding mode
Nonlinear sliding surface
Transient performance
Uncertain systems
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