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Vol. 109, Issue 10, October 2009, pp. 43-58




Adaptive PI Controller for a Nonlinear System


D. Rathikarani, *D. Sivakumar

Dept. of Instrumentation Engineering, Annamalai University,

Annamalainagar 608002, India

Tel.: 914144223640, *9443238642

E mail: dradhikarani_2k6@yahoo.co.in, dsk2k5@gmail.com



Received: 28 August 2009   /Accepted:  23 October 2009   /Published:  30 October 2009


Abstract: Most of the industrial processes are inherently nonlinear in their behaviour. Designs of controllers for these nonlinear processes are difficult, as they do not follow superposition theorem. Adaptive controller can change its behaviour in response to changes in the dynamics of the process and disturbances. Hence adaptive controller can be used to control nonlinear processes. Direct Model Reference Adaptive Control is a technique, in which a reference model involving the desired performances is specified. In the present work, a DMRAC is designed and implemented to achieve satisfactory control of a nonlinear system in all its local linear operating regions. The closed loop system is made BIBO stable by proper control techniques. The controller is designed through simulation in Matlab platform and is validated in real time by conducting experiments on the laboratory Air Flow Control System using the dSPACE interface.


Keywords: Nonlinear system, Direct model reference adaptive control (DMRAC), Adaptive MIT control, Adaptive PI control, Fixed gain controller


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