Active vibration control system using a gyro-stabilizer

Abstract

This paper presents an outline of an active vibration control system using 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 single gimbal, generates moments to control wind-induced vibrations of tall buildings with a predominant bending mode of deformation. Records of forced vibration tests confirmed that the control gain was smoothly changed 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-induced vibrations. These records show that the acceleration response with control was reduced to less than a half of the response without control.