An off-and-towards-equilibrium strategy for vibrational control of
structures
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Yang Runlin (ÑîÈóÁÖ)1, Mai Tong (ͯ Âõ)2, Zhou Xiyuan (ÖÜÎýÔª)3,
Yan Weiming (ãÆάÃ÷)3 and Liu Xihui (ÁõÎýÜö)4
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1. Department of Civil Engineering, Civil & Environment Engineering
School, University of Science and Technology Beijing, Beijing 100083, China
2. National Center for Earthquake Engineering Research, SUNY at Buffalo, 109 Red
Jacket Quad., Buffalo, NY 14261, USA
3. School of Architecture and Civil Engineering, Beijing University of
Technology, Beijing 100022, China
4. Electronic Information Center, Ministry of Information Industry, Beijing
100846, China
Abstract:
Traditional control strategies have
difficulty handling nonlinear behavior of structures, time variable features and
parameter uncertainties of structural control systems under seismic excitation.
An off-and-towards-equilibrium (OTE) strategy combined with fuzzy control is
presented in this paper to overcome these difficulties. According to the OTE
strategy, the control force is designed from the viewpoint of a mechanical
relationship between the 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 the performance of the proposed
strategy, the seismic performance of a three-story shear building 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, there are no design
guidelines to set up the corresponding control rule table for a FLC. Based on
the proposed strategy for the FLC, a control rule table associated with the
building under study is developed, which then allows formation of a detailed
algorithm. The results obtained in this study show that the proposed strategy
performs slightly better than the linear quadratic regulator (LQR) strategy,
while possessing several advantages over the LQR controller. Consequently, the
feasibility and validity of the proposed strategy are verified.
Keywords:
structural vibration control; control
strategy; off-and-towards-equilibrium control; fuzzy control; seismic
excitation; active tendon system
