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FINITE ELEMENT MODEL UPDATING USING ANTIRESONANT FREQUENCIES

โœ Scribed by K. JONES; J. TURCOTTE

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
204 KB
Volume
252
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

This paper uses antiresonant frequencies in the "nite element model updating of an experimental 6-m aluminum truss and analyzes the physical correctness of the updated model by using it to detect damage. Rigid elements are used to simplify the modelling of welded joints, and their dimensions are used as parameters in an iterative update based on eigenvalue and antiresonance sensitivities. An update using both natural frequencies and antiresonant frequencies is shown to produce a 48% better correlation to experimental frequency response functions (FRFs) than an update that uses only natural frequencies. The antiresonant updated model is used to predict FRFs for the truss in 112 damaged con"gurations. Pattern classi"cation and curve-"t algorithms for damage detection are tested. The curve-"t method correctly identi"ed damage 92)6% of the time compared to 76)1% for the pattern classi"er. The high quality of the model is attributed to the use of rigid elements that are updated using antiresonant frequencies.

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