ACTIVE VIBRATION CONTROL-SYSTEM USING A GYRO-STABILIZER

This paper presents an outline of an active vibration control system u sing gyro-stabilizers, as well as the results of corroboration testing and an application to control wind-induced vibrations on a 108m tower -like structure. The gyro-stabilizer, which has a flywheel with a sing le gimbal, generates moments to control wind-induced vibrations of tal l buildings with a predominant bending mode of deformation. Records of forced vibration tests confirmed that the control gain was smoothly c hanged in accordance with the response of the structure, resulting in an increase of the damping ratio of the structure from 0.25% to 1.6%. The effectiveness of the gyro-stabilizers was also corroborated by the response records observed in an application of the system to wind-ind uced vibrations. These records show that the acceleration response wit h control was reduced to less than a half of the response without cont rol. Copyright (C) 1997 Elsevier Science Ltd.