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An off-and-towards-equilibrium strategy for vibrational control of structures

Yang Runlin (杨润林)1, Mai Tong (童 迈)2, Zhou Xiyuan (周锡元)3, Yan Weiming (闫维明)3 and Liu Xihui (刘锡荟)4

  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

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Copyright 2009 IEM. Journal of Earthquake Engineering and Engineering Vibration. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as described below, without written permission from the Publisher. Copying of articles is not permitted except for personal and internal use, to the extent permitted by national copyright law, or under the terms of a license issued by the National Reproduction Rights Organization of China.