A hybrid mass damper system controlled by H-infinity control theory for reducing bending-torsion vibration of an actual building

A pair of hybrid mass dampers has been installed on an actual 23-storey bui lding located in Tokyo. The aim of the dampers is to counteract wind and sm aller earthquake excited oscillations. H-infinity control theory has been a pplied to control the dampers for reducing both bending and torsion vibrati ons simultaneously. For the design of the controller, identification parame ters resulting from the forced vibration test of the building are adopted. The target of the controller performance is to reduce the vibration of firs t mode and to keep robust stabilization over the second or higher mode. Fro m the results of forced vibration tests conducted after installation of the controller, it was confirmed that this system has proven control effect, l argely satisfying what was aimed for in the design. Furthermore, system per formance has been continually recorded during earthquakes, and analysis of the data has proved control effect. Copyright (C) 2001 John Wiley & Sons, L td.