Title
Linear and nonlinear damage detection using a scanning laser vibrometer Linear and nonlinear damage detection using a scanning laser vibrometer
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
conferenceObject
Publication
New York :Wiley-Interscience ,
Subject
Engineering sciences. Technology
Source (journal)
Shock and vibration. - New York
Source (book)
4th International Conference on Vibration Measurements by Laser, Techniques, June 21-23, 2000, Ancona, Italy
Volume/pages
9(2002) :1-2 , p. 43-56
ISSN
1070-9622
ISI
000174626500006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Because a Scanning Laser Vibrometer (SLV) can perform vibration measurements with a high spatial resolution, it is an ideal instrument to accurately locate damage in a structure. Unfortunately, the use of linear damage detection features, as for instance FRFs or modal parameters, does not always lead to a successful identification of the damage location. Measurement noise and nonlinear distortions can make the damage detection procedure difficult. In this article, a combined linear-nonlinear strategy to detect and locate damage in a structure with the aid of a SLV, will be proposed. To minimize the effect of noise, the modal parameters will be estimated using a Maximum Likelihood Estimator (MLE). Both noise and nonlinear distortion levels are extracted using the residuals of a two-dimensional spline fit. The validation of the technique will be performed on SLV measurements of a delaminated composite plate.
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