Experimental Study of Active Vibration Control.
Final technical rept. 1 Sep 83-31 Dec 84,
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCEAN ENGINEERING
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Three different types of active vibration damping were implemented on a pendulous, two-dimensional laboratory structure having high modal density at low frequencies 0-10 Hz and very light inherent damping. The most effective control system included an array processor the controller and five pairs of dual colocated velocity sensors and force actuators. This control system was used for implementation of two different active damping technique, uncoupled and coupled rate feedback. The latter was based on modal-space active damping. Both techniques produced heavy active damping of eleven modes with natural frequencies under 10 Hz, and both positively augmented the damping of all modes. Both techniques were proven to be completely stable and stability-robust rleative to errors in the structure theoretical model. Very good agreement was achieved between experimentally measured and theoretically calculated structure-control system dynamic response. The most significant result is that the technique of coupled rate feedback with dual sensors and actuators effectively damped many more modes than the number of control actuators while producing no spillover instability. Author