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Structural physical parameter identification based on evolutionary-simplex algorithm and structural dynamic response

Du Xiuli (杜修力)1 and Zengdi (曾迪)2

  1. Beijing University of Technology, Beijing 100022, China

  2. China Institute of Water Resources and Hydropower Research, Beijing 100044, China

Abstract: Evolutionary computation based on the idea of biologic evolution is one type of global optimization algorithm that uses self-adaptation, self-organization and random searching to solve optimization problems. The evolutionary-simplex algorithm is introduced in this paper. It contains floating encoding which combines the evolutionary computation and the simplex algorithm to overcome the problems encountered in the genetic algorithm and evolutionary strategy methods. Numerical experiments are performed using seven typical functions to verify the algorithm. An inverse analysis method to identify structural physical parameters based on incomplete dynamic responses obtained from the analysis in the time domain is presented by using the evolutionary-simplex algorithm. The modal evolutionary-simplex algorithm converted from the time domain to the modal domain is proposed to improve the inverse efficiency. Numerical calculations for a 50-DOF system show that when compared with other methods, the evolutionary-simplex algorithm offers advantages of high precision, efficient searching ability, strong ability to resist noise, independence of initial value, and good adaptation to incomplete information conditions.

Keyword: modal parameter; physical parameter; inverse analysis; evolutionary-simplex algorithm

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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.