Title :
Nonlinear observer for pneumatic system with non-negligible connection port restriction
Author :
Bigras, Pascal ; Khayati, Karim
Author_Institution :
Ecole de Technologic Superieure, Montreal, Que., Canada
Abstract :
This paper presents an approach to design an observer for a pneumatic cylinder system for which the connection port comprises a non-negligible restriction. The pressure chamber of this system is difficult to control because the servo valve and the connection port form a double restriction. Moreover, the pressure in the cylinder cannot be directly measured and cannot be expressed as an explicit function of the measurable pressure. A nonlinear observer is further designed to estimate the pressure in the chamber by using the measured pressure outside the cylinder. The linear matrix inequality (LMI) approach is used to calculate the observer gains which ensure the exponential stability of the estimation error. Simulation results show good performance of the proposed observer.
Keywords :
asymptotic stability; dynamics; matrix algebra; nonlinear systems; observers; pneumatic systems; pressure control; compressed air systems; exponential stability; linear matrix inequality; nonlinear systems; observer; pneumatic cylinder system; pressure chamber; pressure control; Control systems; Estimation error; Friction; Pneumatic systems; Pressure control; Pressure measurement; Servomechanisms; Sliding mode control; Stability; Valves;
Conference_Titel :
American Control Conference, 2002. Proceedings of the 2002
Print_ISBN :
0-7803-7298-0
DOI :
10.1109/ACC.2002.1025281