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Semi-active multivariable adaptive control of structures under earthquake excitations

Golafshani, A. A ; Sharif University of Technology | 2001

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  1. Type of Document: Article
  2. Publisher: Sharif University of Technology , 2001
  3. Abstract:
  4. In this paper, a semi-active multivariable adaptive controller is designed for a framed structure under a seismic disturbance using a filtered-x NLMS optimizer. Actuator and large power supply are not required, since just some valves and a battery-size power supply are sufficient for controlling the amount of hydraulic fluid flow through the by-pass on off-orifice channel in an energy dissipating system, which consists of a piston attached to Λ-shaped wind bracing of the building and a cylinder attached to the upper floor. It is assumed that only a rough finite element model of the structure is available. In addition, in order to search for optimal non-classical viscous damper coefficients, acting as calibration measures for the corresponding orifice size of the by-pass channels of dissipation systems, the adaptive controller parameters are estimated by Normalized Least-Mean-Squares strategy. The simulation results demonstrate that even though the controllability offered by this system does not equal that of an active counterpart, it is almost as effective. Considering low-power requirement for the proposed system appears more attractive and practical in real structures
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  7. Source: Scientia Iranica ; Volume 8, Issue 1 , 2001 , Pages 38-53 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_2781.html