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Proceedings Paper

Simplified algorithm for seismic control of civil structures using smart dampers
Author(s): Shahram Sarkani; Loren D. Lutes; Shuang Jin
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Paper Abstract

The development of magnetorheological (MR) fluid damping devices has made it reasonable to consider incorporating controllable dampers to increase structural reliability by limiting seismic structural response. Several properties experimental studies have focused on characterizing the dynamic behavior of the MR dampers and have illustrated that significant changes in the quite nonlinear force-velocity relationship can be achieved by controlling the magnetic field of such devices. There have also been previous studies of control algorithms for this type of smart damper based on adjustments to techniques from nonlinear optimal/active control. This leads to a relatively complicated structure for the nonlinear control algorithm. This paper investigates the possibility of developing a much simpler nonlinear control algorithm for seismic control of civil structure using the smart MR dampers. The control philosophy is based on consideration of the energy balance in the structure of suing the unique, controllable characteristics of the MR dampers to minimize the distortional energy in the structure. Numerical results for response to random excitations illustrate that this simplified nonlinear control algorithm may provide additional reductions of building structural distortions, particularly in the top story.

Paper Details

Date Published: 18 May 1999
PDF: 8 pages
Proc. SPIE 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, (18 May 1999); doi: 10.1117/12.348689
Show Author Affiliations
Shahram Sarkani, George Washington Univ. (United States)
Loren D. Lutes, Texas A&M Univ. (United States)
Shuang Jin, George Washington Univ. (United States)

Published in SPIE Proceedings Vol. 3671:
Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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