Application of electromagnet using magnetization or demagnetization for magnetic damper

Taichi Matsuoka, Katsuaki Sunakoda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper the authors develop a new type of a hybrid magnetic damper which has a variable damping force generated by hybrid electromagnets. The hybrid electromagnet is composed of a ferrite core combined with a rare-earth magnet. The damper can make the damping coefficient increasing from neutral value with magnetized field, or otherwise decreasing it with demagnetized field. It has also a fail-safe mechanism under an electrically malfunction. In order to determine the magnetic damping coefficients created by eddy current depend on a shape of a magnet and a conductive disk, it is accurately calculated by using an arc shape. For investigating about dynamic properties, resisting force characteristics are measured by using a vibration actuator. In experimental results, the damper has a damping coefficient which is proportional to current squared increasing and decreasing from neutral value. Seismic response simulations of one-degree-of-freedom system with the hybrid damper are calculated using LQR control. The effects of vibration suppression are confirmed numerically.

Original languageEnglish
Title of host publicationASME 2008 Pressure Vessels and Piping Conference, PVP2008
Pages49-54
Number of pages6
DOIs
Publication statusPublished - 1 Dec 2008
EventASME 2008 Pressure Vessels and Piping Conference, PVP2008 - Chicago, IL, United States
Duration: 27 Jul 200831 Jul 2008

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume8
ISSN (Print)0277-027X

Conference

ConferenceASME 2008 Pressure Vessels and Piping Conference, PVP2008
CountryUnited States
CityChicago, IL
Period27/07/0831/07/08

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Matsuoka, T., & Sunakoda, K. (2008). Application of electromagnet using magnetization or demagnetization for magnetic damper. In ASME 2008 Pressure Vessels and Piping Conference, PVP2008 (pp. 49-54). (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 8). https://doi.org/10.1115/PVP2008-61141