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Iterative modal strain energy method for damage severity estimation using frequency measurements
Author(s) -
Wang Shuqing
Publication year - 2013
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.495
Subject(s) - modal , noise (video) , finite element method , structural engineering , energy (signal processing) , beam (structure) , strain energy , energy method , strain (injury) , mode (computer interface) , computer science , algorithm , materials science , mathematics , statistics , engineering , artificial intelligence , composite material , medicine , image (mathematics) , operating system
SUMMARY A damage severity estimation method, named as iterative modal strain energy (IMSE) method, is developed to quantify the damage magnitude using the frequency measurements. Although all existing damage quantification methods that utilize modal strain energy are either employing mode shapes from the damage structure or under/overestimating the damage severity, the IMSE method is able to estimate the severity accurately, requiring only a few amount of identified modal frequencies from the damaged structure. To demonstrate the capabilities of the developed damage severity estimation algorithm, numerical studies are conducted of a clamped‐free beam based on data generated from finite element models. Both noise‐free and noise‐polluted cases are considered. Furthermore, experimental data from a tested clamped‐free beam are utilized to validate the IMSE method. The results demonstrate that the proposed algorithm is capable of quantifying the damage extent accurately. Copyright © 2011 John Wiley & Sons, Ltd.