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Tracking Error Constrained Super-twisting Dynamic Surface Control of Partially Known Nonlinear Systems with a Super-twisting Nonlinear Disturbance Observer

  • Seong-Ik HanEmail author
Regular Papers Control Theory and Applications
  • 47 Downloads

Abstract

This paper proposes a tracking error constrained dynamic surface control (DSC) method combined with a super-twisting control (STC) and a super-twisting nonlinear disturbance observer for a nonlinear strict-feedback system, where the system functions are partially known. In the recursive dynamic surface control procedures, the stabilizing controls of the DSC were designed by combining the STC with the virtual tracking errors defined from the DSC design concept and estimate for uncertainty. A super-twisting nonlinear disturbance observer was designed to estimate the unknown nonlinear function and external disturbance instead of using parameterization of the nonlinear function or adaptive law in the conventional STC and DSC schemes. A simpler DSC design procedure by eliminating necessity of differentiation of the filtered output error in the conventional DSC scheme and a tracking error constraining control scheme are also proposed. The proposed STC-DSC scheme combined with a super-twisting nonlinear disturbance observer has better tracking error performance and robustness to uncertainty than control systems with a conventional nonlinear disturbance observer. The control scheme was evaluated through simulations with two nonlinear systems.

Keywords

Dynamic surface control super-twisting control super-twisting disturbance nonlinear observer tracking error constaint control 

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Copyright information

© ICROS, KIEE and Springer 2019

Authors and Affiliations

  1. 1.Department of Mechanical System EngineeringDongguk University Gyeongju CampusGyeongju-city, Gyeongsangbuk-doKorea

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