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Title: Damage localization in plate structures from flexibility and its derivatives
Authors: Wu, D
Law, SS
Keywords: Damage detection
Issue Date: 2004
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2004, v. 5391, 449 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
Abstract: The purpose of this study is to search for an efficient flexibility-based method for locating damage in plate structures. Although a large number of methods exist for detecting damage in a structure using measured modal parameters, many of them require a correlated finite element model. In this paper several damage localization methods based on changes in the modal flexibility, Uniform Load Surface (ULS), and their curvatures will be discussed. These methods require frequencies and mode shapes from the lower modes of the plate before and after damage, or only the eigen-pairs from the damaged state if the gapped-smoothing technique is applied. The method based on flexibility changes or flexibility curvature was originally proposed to localize damage in one-dimensional beam-like structures. In this paper this technique is generalized to two-dimensional plate structures using Chebyshev polynomial approximation, and incorporated with ULS, the derivative of modal flexibility, and its curvature for detecting damage in plates. Numerical examples considering measurement noise, mode truncation, and sensor sparsity are studied to evaluate and compare the effectiveness of the proposed methods. It is found that the ULS curvature is the most sensitive index for locating damage, especially for truncated and noisy measurements.
Description: Smart Structures and Materials 2004 : Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, San Diego, CA, USA, 14-18 March 2004
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.540903
Appears in Collections:Conference Paper

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