Control of Flexible Spacecraft Structures Using H-Infinity Wave Absorbing Control

摘要

This work studies the use of a wave absorbing control law for vibrationsuppression of flexible spacecraft structures. A major advantage of this method is that it does not involve truncation into a finite dimensional mathematical model. A closed loop scattering matrix was derived which gives the relationship between incoming waves, outgoing waves, sensor and actuator. The control law was determined by minimizing the H-infinity norm of this matrix. The control law was applied to the Naval Postgraduate School's Flexible Spacecraft Simulator (FSS) for vibration suppression. The simulator's flexible beam was controlled using piezoceramic wafers as sensors and actuators. The H-infinity wave absorbing controller contributed significant damping to the structure, especially at the first mode of 1 Hz. Therefore, wave absorbing control and piezoceramic sensors and actuators offer a viable approach for vibration suppression of space structures. (MM).