Modeling of a large-scale magneto-rheological damper for seismic hazard mitigation. Part II: Semi-active mode

SUMMARY A magneto‐rheological (MR) damper is a semi‐active device where the damper force capacity is controlled by varying the input current into the damper. In this paper, the dynamics of MR dampers associated with variable current input is studied. Electromagnetic theory is used to model the dynam...

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Bibliographic Details
Published in:Earthquake engineering & structural dynamics 2013-04, Vol.42 (5), p.687-703
Main Authors: Chae, Yunbyeong, Ricles, James M., Sause, Richard
Format: Article
Language:English
Subjects:
Dampers
Differential equations
Earth sciences
Earth, ocean, space
Earthquakes, seismology
Engineering and environment geology. Geothermics
Engineering geology
Exact sciences and technology
Hysteresis
Internal geophysics
magneto-rheological damper
Marine
Mathematical models
non-Newtonian fluid
Nonlinear dynamics
Nonlinearity
Reproduction
seismic hazard mitigation
Seismic phenomena
semi-active control
supplemental damping system
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Summary:SUMMARY A magneto‐rheological (MR) damper is a semi‐active device where the damper force capacity is controlled by varying the input current into the damper. In this paper, the dynamics of MR dampers associated with variable current input is studied. Electromagnetic theory is used to model the dynamics of an MR damper including the eddy current effect and the nonlinear hysteretic behavior of damper material magnetization. A nonlinear differential equation that relates the input current to the damper with a constant equivalent current is proposed. The nonlinear differential equation is combined with the Maxwell Nonlinear Slider (MNS) model to create the variable current MNS model to predict the damper force under variable input current and random damper displacement loading. The model is evaluated by comparing the predicted response of a large‐scale MR damper to the measured damper response from experiments. The experiments include a real‐time hybrid simulation of a 3‐story building structure with a large‐scale MR damper subjected to the design earthquake. The exceptional agreement observed between the predicted and experimental results illustrate the robustness and the accuracy of the variable current MNS model. Copyright © 2012 John Wiley & Sons, Ltd.
ISSN:0098-8847
1096-9845
DOI:10.1002/eqe.2236