Vol. 2, No. 1, 2007

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ISSN: 1559-3959
A damage index for structural health monitoring based on the empirical mode decomposition

Nader Cheraghi and Farid Taheri

Vol. 2 (2007), No. 1, 43–61
Abstract

This paper presents two novel damage indices based on empirical mode decomposition (EMD) and fast Fourier integration for identifying structural damage caused by a change in structural stiffness. The paper also demonstrates the effectiveness of the proposed damage indices formulated based on a series of coupled mathematical/engineering approaches that are used to detect damage in pipes reliably and accurately. The main approach is based on monitoring the vibration response of pipes using piezoelectric sensors and the first intrinsic mode functions (IMFs). Finite element analysis is used to simulate the response of a healthy pipe, as well as pipes with various sizes of damage. Damages are meant to represent the outcome of local corrosion (damage) with varying reduction in areas around the circumference of the pipe. The evaluated damage indices could effectively establish the location of the defects. Moreover, the evaluated energy indices could also distinguish various size defects. To demonstrate further the effectiveness of our proposed damage indices, the results are compared with other effective indices based on wavelet packet and other statistical methods reported in the literature.

Keywords
damage detection, empirical mode decomposition, wavelet, vibration based, health monitoring
Milestones
Received: 8 December 2005
Revised: 11 May 2006
Accepted: 1 July 2006
Published: 1 March 2007
Authors
Nader Cheraghi
Colt Engineering Corporation
Canada Department of Civil & Resource Engineering
Calgary, AB
Canada
Farid Taheri
Department of Civil & Resource Engineering
Dalhousie University
1360 Barrington St.
Halifax, NS B3J 1Z1
Canada
http://myweb.dal.ca/farid