An Off-and-Towards-Equilibrium Strategy for Vibrational Control of Structures

Traditional control strategies have difficulty handling nonlinear behavior of structures, time variable features, and parameter uncertainties of structural control systems under seismic excitation. This paper presents an off-and-towards-equilibrium (OTE) strategy combined with fuzzy control to overcome these difficulties. According to the OTE strategy, the control force is designed from the viewpoint of a mechanical relationship between motions of the structure, the exciting force, and the control force. The advantage of the OTE strategy is that it can be used for a variety of control systems. In order to evaluate performance of the proposed strategy, the seismic performance of a 3-story shear structure with an Active Tendon System (ATS) using a Fuzzy Logic Controller (FLC) is studied. The main advantage of the fuzzy controller is its inherent robustness and ability to handle any nonlinear behavior of structures. However, no design guidelines are set up for the corresponding control rule table for an FLC. Based on the proposed strategy for the FLC, a control rule table associated with the structure under study is developed which allows formation of a detailed algorithm. The results obtained show the proposed strategy performs slightly better than the linear quadratic regulator (LQR) strategy while possessing many advantages over the LQR controller. The feasibility and validity of the proposed strategy are verified.

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  • Authors:
    • Runlin, Yang
    • Tong, Mai
    • Xiyuan, Zhou
    • Weiming, Yan
    • Xihui, Liu
  • Publication Date: 2006-12


  • English

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  • Accession Number: 01046621
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 9 2007 2:09PM