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Structural Engineering and Mechanics
  Volume 41, Number 3, February10 2012, pages 349-363
DOI: http://dx.doi.org/10.12989/sem.2012.41.3.349
 


Effects of multiple MR dampers controlled by fuzzy-based strategies on structural vibration reduction
Claudia Mara Dias Wilson

 
Abstract
    Fuzzy logic based control has recently been proposed for regulating the properties of magnetorheological (MR) dampers in an effort to reduce vibrations of structures subjected to seismic excitations. So far, most studies showing the effectiveness of these algorithms have focused on the use of a single MR damper. Because multiple dampers would be needed in practical applications, this study aims to evaluate the effects of multiple individually tuned fuzzy-controlled MR dampers in reducing responses of a multi-degree-of-freedom structure subjected to seismic motions. Two different fuzzy-control algorithms are considered, a traditional controller where all parameters are kept constant, and a gainscheduling control strategy. Different damper placement configurations are also considered, as are different numbers of MR dampers. To determine the robustness of the fuzzy controllers developed to changes in ground excitation, the structure selected is subjected to different earthquake records. Responses analyzed include peak and root mean square displacements, accelerations, and interstory drifts. Results obtained with the fuzzy-based control schemes are compared to passive control strategies.
 
Key Words
    MR damper; semi-active control; fuzzy logic; fuzzy control; structural control
 
Address
Claudia Mara Dias Wilson: New Mexico Institute of Mining and Technology, Socorro, NM, USA
 

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