A hybrid attitude controller consisting of electromagnetic torque rods and an active fluid ring

A hybrid attitude controller consisting of electromagnetic torque rods and an active fluid ring

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Article ID: iaor2014969
Volume: 94
Issue: 1
Start Page Number: 470
End Page Number: 479
Publication Date: Jan 2014
Journal: Acta Astronautica
Authors: ,
Keywords: control, simulation: applications
Abstract:

In this paper, a novel hybrid actuation system for satellite attitude stabilization is proposed along with its feasibility analysis. The system considered consists of two magnetic torque rods and one fluid ring to produce the control torque required in the direction in which magnetic torque rods cannot produce torque. A mathematical model of the system dynamics is derived first. Then a controller is developed to stabilize the attitude angles of a satellite equipped with the abovementioned set of actuators. The effect of failure of the fluid ring or a magnetic torque rod is examined as well. It is noted that the case of failure of the magnetic torque rod whose torque is along the pitch axis is the most critical, since the coupling between the roll or yaw motion and the pitch motion is quite weak. The simulation results show that the control system proposed is quite fault tolerant.

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