Designing a Mechanism for Fault Diagnosis of Space Reaction Wheel by Piezoelectric Sensors and Neglecting the Rotor Inertia, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor) ; Zabihollah, Abolghasem (Supervisor)
Abstract
A Reaction Wheel (RW) is a torque actuator which is used for attitude control of a satellite. Reaction Wheels usually consist of a brushless DC motor which rotates a flywheel. When the flywheel is accelerated by the motor, the reaction torque of the motor applies to the base of the RW and therefore the satellite can rotate along the RW spin axis. Due to frictionless surrounding of a satellite in space, a very small disturbance in a reaction wheel structure during its function may lead to instability of satellite and decrease the satellite precision and performance. There are some important sources of disturbance in an RW. Some of them are: 1- Unbalances in wheel (offset of center of gravity...
Cataloging briefDesigning a Mechanism for Fault Diagnosis of Space Reaction Wheel by Piezoelectric Sensors and Neglecting the Rotor Inertia, M.Sc. Thesis Sharif University of Technology ; Salarieh, Hassan (Supervisor) ; Zabihollah, Abolghasem (Supervisor)
Abstract
A Reaction Wheel (RW) is a torque actuator which is used for attitude control of a satellite. Reaction Wheels usually consist of a brushless DC motor which rotates a flywheel. When the flywheel is accelerated by the motor, the reaction torque of the motor applies to the base of the RW and therefore the satellite can rotate along the RW spin axis. Due to frictionless surrounding of a satellite in space, a very small disturbance in a reaction wheel structure during its function may lead to instability of satellite and decrease the satellite precision and performance. There are some important sources of disturbance in an RW. Some of them are: 1- Unbalances in wheel (offset of center of gravity...
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