Search

Your search keyword '"Michael A. Demetriou"' showing total 38 results
Start Over Author "Michael A. Demetriou" Publication Type Academic Journals
38 results on '"Michael A. Demetriou"'

38. On-line fault/damage detection schemes for mechanical and structural systems.

Author

Michael A. Demetriou and Zhikun Hou

Subjects
ARTIFICIAL neural networks, WAVELETS (Mathematics), HARMONIC analysis (Mathematics), MATHEMATICS, ELECTRIC oscillators
Abstract

On-line monitoring has become an attractive approach to detecting faults in a system during its service time. Once a fault is detected, necessary measures can be employed to ensure satisfactory system performance and to prevent drastic economic loss that may be caused by the fault. This paper presents a performance study of two fault detection/diagnosis approaches, namely the wavelet-based and the neural-network-based on-line schemes. A brief summary of the wavelet-based approach and two theorems on the neural-network-based on-line approximation scheme are given. The schemes are illustrated for a single-degree-of-freedom (SDOF) oscillator and a three-degree-of-freedom mechanical system with damageable springs. Only harmonic excitations and abrupt changes in the system stiffness due to breakage of springs caused by the first passage of a threshold value are considered. Extensive numerical studies show that both approaches may be successfully implemented on-line to detect the times when faults occurred and to locate regions where faults occurred. In addition, the on-line neural network scheme is able to provide diagnosis of the fault by correctly identifying the stiffness change. In contrast to the neural-network-based on-line approximation, where information on the healthy system and both displacement and velocity response measurements are required, the wavelet approach seems less model-dependent and only the acceleration measurement is required. This study demonstrates the great promise of these schemes for on-line structural health monitoring. Copyright © 2003 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results