Katsuyasu Sasaki

Active tuned mass damper

A new control strategy to improve a tuned mass damper (TMD) is developed for the vibration control of a large structure subjected to external disturbances. The feedback gain of the proposed algorithm is linear to the response acceleration of the primal system and it is optimized in the frequency domain under a harmonic excitation. According to this method both the feedback gain and the TMD parameters are optimized in the frequency domain and they are expressed in a set of closed form solutions. The performance of the proposed control method is discussed and compared with that of a passive TMD.

Active structural response control system

Abstract This report introduces the active mass driver (AMD) system, which is one of the active structural response control systems. The AMD system, in brief, aims to suppress building vibrations caused by earthquakes and/or strong winds by installing an auxiliary mass in the building and controlling it by operating an actuator. In succession, our studies were promoted for its practical use, and in August 1989, this AMD system was installed and put into operation in a building built in Tokyo. The practical application of the active structural response control system is the first of its kind in the world. Two and a half years have passed since its completion, and results from the observations of many earthquakes and strong winds have been amassed, verifying the vibration reducing effect.