Reduced‐order implementation of disturbance observers for robust tracking of non‐linear systems. Issue 17 (1st November 2014)

• Record Type: Journal Article
• Authors: Back, Juhoon; Shim, Hyungbo
• Is Part Of: IET control theory & applications. Volume 8:Issue 17(2014)
• Page Start: 1940
• Page End: 1948
• Publication Date: 2014-11-01
• Subjects: observers -- reduced order systems -- nonlinear control systems -- robust control -- transfer functions -- uncertain systems -- magnetic levitation -- control system synthesis; robust tracking -- disturbance‐observer‐based control -- robust control scheme -- Q‐filters -- transfer function -- reduced‐order DOBC structure -- uncertain nonlinear systems -- robust transient response -- numerical simulation -- magnetic levitation system -- controller design procedure -- controller performance; Control theory -- Periodicals; Automatic control -- Periodicals; 629.8312
• DOI: 10.1049/iet-cta.2013.1036
• Languages: English
• ISSNs: 1751-8644

Abstract

Abstract : The disturbance‐observer‐based control (DOBC) is a well‐known robust control scheme and recently its non‐linear version has been developed. Observing that two components (so‐called Q‐filters) in the conventional DOBC structure have the same transfer function, the authors propose a reduced‐order DOBC for uncertain non‐linear systems. It is shown that the proposed controller also guarantees the same robust transient response as those developed before. Numerical simulations using a magnetic levitation system are included to illustrate the detailed design procedure and validate the performance of the proposed controller.