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dc.contributor.authorNagi, F.en_US
dc.contributor.authorAhmed, S.K.en_US
dc.contributor.authorZainul Abidin, A.A.en_US
dc.contributor.authorNordin, F.H.en_US
dc.description.abstractTwo level bang-bang controllers are generally used in conjunction with the thrust reaction actuator for spacecraft/satellite attitude control. These controllers are fast acting and dispense time dependent; full or no thrust-power to control the satellite attitude in minimum time. A minimum time-fuel attitude control system extends the life of a satellite and is the main focus of this paper. Fuzzy controllers are favored for satellite control due to their simplicity and good performance in terms of fuel saving, absorbing non-linearities and uncertainties of the plant. A fuzzy controller requires a soft fuzzy engine, and a hardware relay to accomplish bang-bang control action. The work in this paper describes a new type of fuzzy controller in which the hardware relay action is configured in the soft fuzzy engine. The new configuration provides fuzzy decision-making flexibility at the inputs with relay like two-level bang-bang output. The new fuzzy controller is simulated on a three-axis satellite attitude control platform and compared with conventional a fuzzy controller, sliding mode controller and linear quadratic regulator. The result shows that the proposed controller has minimum-time response compared to other controllers. Inherent chattering associated with a two-level bang-bang controller produces undesirable low amplitude frequency limit cycles. The chattering can be easily stopped in the proposed fuzzy bang-bang relay controller, hence adding multi-functionality to its simple design. © 2010 Elsevier B.V. All rights reserved.en_US
dc.relation.ispartofFuzzy Sets and Systems Volume 161, Issue 15, 1 August 2010, Pages 2104-2125en_US
dc.titleFuzzy bang-bang relay controller for satellite attitude control systemen_US
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