DYNAMIC PERFORMANCE EVALIATION OF 200kN MAGNETO-RHEOLOGICAL DAMPER

Magneto-rheological damper (MR damper) has been expected to control the response of civil and building structures in recent years, because of its large force capacity and controllable force characteristics. Recent study is to the application of controllable dampers for reducing earthquake response of buildings and/or wind induced sway. The dynamic characteristics of the MR damper have to be clarified, in order to install and activate MR damper to the structure for controlling the response. In this paper, the design of MR damper with bypass flow portion and its dynamic analytical model are outlined. The dynamic characteristics of the damper were examined by dynamic excitation tests comparing with two types of magneto-rheological fluids. From the experimental and analytical results, the effectiveness and validity of MR damper are discussed in this paper