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Seismic response control using electromagnetic inertial mass dampers |
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| Authors: | Yutaka Nakamura Akira Fukukita Kazuo Tamura Issei Yamazaki Taichi Matsuoka Kazuhiko Hiramoto Katsuaki Sunakoda |
| Institution: | 1. Institute of Technology, Shimizu Corporation, Tokyo, Japan;2. Department of Architecture and Civil Engineering, Chiba Institute of Technology, Chiba, Japan;3. Research and Development Department, Sanwa Tekki Corporation, Tochigi, Japan;4. School of Science and Technology, Meiji University, Kanagawa, Japan;5. Department of Mechanical and Production Engineering, Niigata University, Niigata, Japan |
| Abstract: | This paper presents a new type of electromagnetic damper with rotating inertial mass that has been developed to control the vibrations of structures subjected to earthquakes. The electromagnetic inertial mass damper (EIMD) consists of a ball screw that converts axial oscillation of the rod end into rotational motion of the internal flywheel and an electric generator that is turned by the rotation of the inner rod. The EIMD is able to generate a large inertial force created by the rotating flywheel and a variable damping force developed by the electric generator. Device performance tests of reduced‐scale and full‐scale EIMDs were undertaken to verify the basic characteristics of the damper and the validity of the derived theoretical formulae. Shaking table tests of a three‐story structure with EIMDs and earthquake response analyses of a building with EIMDs were conducted to demonstrate the seismic response control performance of the EIMD. The EIMD is able to reduce story drifts as well as accelerations and surpasses conventional types of dampers in reducing acceleration responses. Copyright © 2013 John Wiley & Sons, Ltd. |
| Keywords: | response control inertial mass ball screw electromagnetic variable damping shaking table test earthquake response analysis |