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Proceedings Paper

Comparison and improvements of two damage identification methods based on modal strain energy
Author(s): H. S. Wu; L. M. Sun
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Paper Abstract

Damage identification still remains a challenging but critical task in structural health monitoring field though many algorithms have been proposed in the past decades. Among them, methods based on elemental modal strain energy (MSE) change between pre- and post-damage are promising ones owing to their precision and robustness according to the studies conducted in the literature. Stubbs damage index method (SDIM) and Modal strain energy change ratio (MSECR) method are two representative approaches because of their different but original assumptions, having attracted considerable attention and thus been continuously improved by researchers. In this paper their efficiencies of damage localization and quantification in single- and multi- damage scenarios are compared through numerical study. Results show that, in general, MSECR method performs better than SDIM, especially in damage quantification. Theoretical discussion and improvements for SDIM are proposed and verified.

Paper Details

Date Published: 15 April 2011
PDF: 10 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79813R (15 April 2011); doi: 10.1117/12.881048
Show Author Affiliations
H. S. Wu, Tongji Univ. (China)
East-China Jiaotong Univ. (China)
L. M. Sun, Tongji Univ. (China)

Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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