Abstract
An innovative method of wave-absorbing control is presented for vibration suppression of flexible space structures. The method needs no digital computation process programmed under the control law that is usually necessary in realistic systems. A torque motor is used not only as an actuator but also a sensor that detects the angular velocity of the motor shaft, and the control loop is closed without digital computation. The control approach is to treat the vibration as superposed wave modes traveling in positive and negative directions and to suppress the outgoing wave modes at the actuator position. The motor is connected to the electric circuit that has a frequency-dependent impedance and constitutes a compensator. The back electromotive force of the motor is generated by the rotation of the motor shaft and is put into the electric circuit to generate electric current. The torque of the motor that is generated by the current is adapted to the wave-absorbing controller. The performance of the present method is verified through both numerical simulation and experiments.
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