Sliding mode output-feedback stabilization of uncertain nonlinear nonaffine systems

• Published in: Automatica (Oxford) Vol. 48; no. 12; pp. 3106 - 3113
• Main Authors: Bartolini, Giorgio, Punta, Elisabetta
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2012; Elsevier
• Subjects: Applied sciences; Channels; Computer science; control theory; systems; Control system synthesis; Control systems; Control theory. Systems; Convergence; Exact sciences and technology; Modelling and identification; Nonlinear observers; Nonlinearity; Observers; Sliding mode control; Stabilization; State vectors; Strategy; Uncertain nonlinear nonaffine systems; Uncertain nonlinear nonaffine systems; Nonlinear observers; Sliding mode control; Variable structure control; Sliding mode; Bounded error; Non linear control; Feedback regulation; Control synthesis; Non linear system; Uncertain system; System identification; Output feedback; Non linear observer
• ISSN: 0005-1098; 1873-2836
• DOI: 10.1016/j.automatica.2012.08.015

The paper considers the variable-structure output-feedback stabilization of nonlinear uncertain nonaffine systems when the state vector is not completely available and the use of observers is required. The strategy of introducing integrators in the input channel is exploited to enlarge the class of tractable control systems. A full-order observer is designed and the control problem is solved by forcing a sliding regime for the observer. Depending on the type of uncertainties, conditions are found under which convergence to the unique ideal solution of both the system and the observer, either exponentially or with a bounded error, is proven.