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29 July 2004 A new modular magnetorheological fluid valve for large-scale seismic applications
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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.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaojie Wang, Faramarz Gordaninejad, Gregory H. Hitchcock, Kiran Bangrakulur, Alan Fuchs, Jake Elkins, Cahit A. Evrensel, Umit Dogruer, Shubin Ruan, Mike Siino, and Mary Q. Kerns "A new modular magnetorheological fluid valve for large-scale seismic applications", Proc. SPIE 5386, Smart Structures and Materials 2004: Damping and Isolation, (29 July 2004);

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