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Effects of excitation frequency on detection accuracy of orthogonal wavelet decomposition for structural health monitoring

Raul J. Alonso1, Mohammad Noori2, Soheil Saadat2, Arata Masuda3 and Zhikun Hou4

  1. Mechanical Engineering & Electro Optical Systems - MS 368, 1362 Brass Mill Road, Belcamp, MD 21017, USA

  2. Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910, USA

  3. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606- 8585, Japan

  4. Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA 01609, USA

Abstract: Accurate estimation of stiffness loss is a challenging problem in structural health monitoring. In this study orthogonal wavelet decomposition is used for identifying the stiffness loss in a single degree of freedom spring-mass-damper system. The effects of excitation frequency on accuracy of damage detection is investigated. Results show that pseudo-alias effects caused by the orthogonal wavelet decomposition (OWD), affect damage detectability. It is demonstrated that the proposed approach is suitable for damage detection when the excitation frequency is relatively low. This study shows how a priori knowledge about the signal and ability to control the sampling frequency can enhance damage detectability.

Keywords: wavelet analysis; damage detection; structural health monitoring

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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.