Title: Tuning of a new fuzzy bang–bang relay controller for attitude control system

Authors: Farrukh Nagi, Aidil Azwin Bin Zainul Abidin, Abdul Talip Zulkarnain, Jawad Nagi, A. Marwan

Addresses: Universiti Tenaga Nasional, Jalan Kajang-Puchong, Kajang, Selangor 43009, Malaysia. ' Universiti Tenaga Nasional, Jalan Kajang-Puchong, Kajang, Selangor 43009, Malaysia. ' Universiti Tenaga Nasional, Jalan Kajang-Puchong, Kajang, Selangor 43009, Malaysia. ' Universiti Tenaga Nasional, Jalan Kajang-Puchong, Kajang, Selangor 43009, Malaysia. ' Universiti Tenaga Nasional, Jalan Kajang-Puchong, Kajang, Selangor 43009, Malaysia

Abstract: A new fuzzy bang–bang relay controller (FBBRC) is introduced in this paper. The new controller is inherently optimal due to its bang–bang property. The controller has fuzzy decision-making capability in its inputs and have two fixed levels bang–bang output. Consequently, the tuning of FBBRC is restricted to input parameters only in comparison to standard fuzzy logic controller (FLC) where the output parameters can also be tuned. The stability of new controller stems from well-established bang–bang sliding mode control theory. The work presented here demonstrates that tuning the inputs of the proposed FBBRC is more effective and simpler than tuning all the parameters of standard FLC. The two controllers are tuned online with gradient descent optimisation method and tested for regulator and tracking mode control. Simulation result shows that new controller has faster response time and is capable of controlling the system under adverse initial conditions.

Keywords: self-tuning; fuzzy control; LOM; largest of maxima; gradient-based optimisation; bang–bang control; attitude control; relay controllers; sliding mode control; regulator control; tracking mode control; simulation.

DOI: 10.1504/IJAAC.2011.040136

International Journal of Automation and Control, 2011 Vol.5 No.2, pp.97 - 118

Published online: 17 Apr 2015 *

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