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Proceedings Paper

A new modular magnetorheological fluid valve for large-scale seismic applications
Author(s): Xiaojie Wang; Faramarz Gordaninejad; Gregory H. Hitchcock; Kiran Bangrakulur; Alan Fuchs; Jake Elkins; Cahit A. Evrensel; Umit Dogruer; Shubin Ruan; Mike Siino; Mary Q. Kerns
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Paper Abstract

This study presents a modular, large-scale, magneto-rheological (MRF) by-pass valve to be used in seismic damper retrofits for energy mitigation. The by-pass valve is designed, constructed and tested. The MR valve can be used to retrofit a commercial passive seismic damper as a semi-active device. The performance of the MRF valve was characterized by means of quasi-static characterizations. A new MR fluid is also developed for the seismic by-pass MRF damper application. This MR fluid has low off-state viscosity and high field-dependent yield strength. The field-dependent rheology of the MR fluid is evaluated with a MR shear rheometer. In addition, a theoretical model is developed taking into account geometric dimensions, fluid properties and applied magnetic field strength. Three-dimensional electromagnetic finite element analysis is used to determine and maximize the magnetic field strength inside the by-pass MRF valving region. Both experimental and theoretical results show that the modular large-scale by-pass MRF damper can generate sufficient dynamic force range which meets the high-force requirements of large-scale structures subjected to seismic or other significant hazards.

Paper Details

Date Published: 29 July 2004
PDF: 12 pages
Proc. SPIE 5386, Smart Structures and Materials 2004: Damping and Isolation, (29 July 2004);
Show Author Affiliations
Xiaojie Wang, Univ. of Nevada/Reno (United States)
Faramarz Gordaninejad, Univ. of Nevada/Reno (United States)
Gregory H. Hitchcock, Univ. of Nevada/Reno (United States)
Kiran Bangrakulur, Univ. of Nevada/Reno (United States)
Alan Fuchs, Univ. of Nevada/Reno (United States)
Jake Elkins, Univ. of Nevada/Reno (United States)
Cahit A. Evrensel, Univ. of Nevada/Reno (United States)
Umit Dogruer, Univ. of Nevada/Reno (United States)
Shubin Ruan, Enidine Inc. (United States)
Mike Siino, Enidine Inc. (United States)
Mary Q. Kerns, Enidine Inc. (United States)

Published in SPIE Proceedings Vol. 5386:
Smart Structures and Materials 2004: Damping and Isolation
Kon-Well Wang, Editor(s)

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