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Analyzing large dynamic set-point change tracking of MRAC by exploiting fuzzy logic based automatic gain tuning

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4 Author(s)
Karthikeyan, R. ; Electron. & Commun. Eng. Dept, Amrita Sch. of Eng., Bangalore, India ; Yadav, R.K. ; Tripathi, S. ; Kumar, H.G.

A Model reference adaptive control (MRAC) belongs to the class of adaptive servo system in which the desired performance is expressed with the help of a reference model. MRAC aims to create a closed loop controller with parameters that can change the response of the system to mimic a desired response. However, analysis unravels that there is a tolerance band for the set point change which defines the effectiveness of a particular adaptive gain (γ). Any changes in the set point which is beyond this band calls for a γ-readjustment. We propose a method which aims to overcome this pitfall in conventional MRAC by fusing fuzzy logic to dynamically vary γ. In essence, a fixed γ which fails to stabilize the system response in the advent of a large change in the average value of the set point shall be empowered with fuzzy logic to do the needful. Also, this concept never requires human interference for gain adjustment. A second order Linear Time Invariant system has been considered for all illustration. The results show considerable improvement in performance over the existing conventional MRAC system.

Published in:

Control and System Graduate Research Colloquium (ICSGRC), 2012 IEEE

Date of Conference:

16-17 July 2012

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