A new modular magnetorheological fluid valve for large-scale seismic applications

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

doi:10.1117/12.540275

29 July 2004 A new modular magnetorheological fluid valve for large-scale seismic applications

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

Author Affiliations +

Proceedings Volume 5386, Smart Structures and Materials 2004: Damping and Isolation; (2004) https://doi.org/10.1117/12.540275
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.540275

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available