Abstract
In this paper, the authors proposes a new type hybrid damper with effects of magnetization and demagnetization. The damper consists of a ball screw, electromagnets, rare-earth magnets, and a conductive disk. The steel core of the electromagnet is connected to the rare-earth magnet. The damper has the controllable damping force that is magnetized in case of positive current of the electromagnet, otherwise demagnetized in case of negative current. The validity of the damper is to utilize by a fail-safe mechanism under the control device trouble, and to be more economy than a semiactive type. In order to investigate the resisting force characteristics of the damper, the vibration tests are carried out using a shaking table. The frequency responses and the seismic responses of one-degree-of-freedom system attached to the damper are calculated, and the damping effects are discussed.
