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Seismic response control using electromagnetic inertial mass dampers
Author(s) -
Nakamura Yutaka,
Fukukita Akira,
Tamura Kazuo,
Yamazaki Issei,
Matsuoka Taichi,
Hiramoto Kazuhiko,
Sunakoda Katsuaki
Publication year - 2013
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.2355
Subject(s) - flywheel , damper , structural engineering , engineering , earthquake shaking table , tuned mass damper , inertial frame of reference , acceleration , vibration , fictitious force , physics , mechanical engineering , acoustics , mechanics , classical mechanics
SUMMARY 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.