FAULT DETECTION USING PSEUDO-MODAL-ENERGIES
AND MODAL PROPERTIES
T. Marwala* and H.E.M. Hunt
Cambridge University Engineering Department
Cambridge, CB2 1PZ, U.K.
E-mail: tm221@eng.cam.ac.uk (* corresponding author)

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Pseudo-modal energies (MEs) defined as the integrals of the real and imaginary components of the frequency response functions, over various frequency bandwidths are proposed for fault detection in structures. Equations that formulate MEs and their respective sensitivities are derived in receptance and inertance form. The ability of pseudo-modal energies to detect faults in structures is studied by using a simulated cantilevered beam and Monte Carlo simulation. The simulated results show that MEs are more resistant to noise, are better indicators of faults and are faster to compute than modal properties.


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(c) Copyright 2001 Professor F.R. Hall - University of Wolverhampton.