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Structural Engineering and Mechanics Volume 32, Number 6, August20 2009 , pages 755-770 DOI: https://doi.org/10.12989/sem.2009.32.6.755 |
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A feasibility study on smart base isolation systems using magneto-rheological elastomers |
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Jeong-Hoi Koo, Dong-Doo Jang, Muhammad Usman and Hyung-Jo Jung
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| Abstract | ||
| This study proposes a new smart base isolation system that employs Magneto-Rheological Elastomers (MREs), a class of smart materials whose elastic modulus or stiffness can be varied depending on the magnitude of an applied magnetic field. It also evaluates the dynamic performance of the MREbased isolation system in reducing vibrations in structures subject to various seismic excitations. As controllable stiffness elements, MREs can increase the dynamic control bandwidth of the isolation system, improving its vibration reduction capability. To study the effectiveness of the MRE-based isolation system, this paper compares its dynamic performance in reducing vibration responses of a base-isolated singlestory structure (i.e., 2DOF) with that of a conventional base-isolation system. Moreover, two control algorithms (linear quadratic regulator (LQR)-based control and state-switched control) are considered for regulating the stiffness of MREs. The simulation results show that the MRE-based isolation system out performed the conventional system in suppressing the maximum base drift, acceleration, and displacement of the structure. | ||
| Key Words | ||
| magneto-rheological elastomer (MRE); base isolation; linear quadratic regulator (LQR); state-switched control. | ||
| Address | ||
| Jeong-Hoi Koo: Department of Mechanical and Manufacturing Engineering, Miami University, Oxford, Ohio 45056, USA Dong-Doo Jang, Muhammad Usman and Hyung-Jo Jung: department of Civil and Environmental Engineering, KAIST, Daejeon 305-701, Korea | ||