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Proceedings Paper

Structural damage localization using an optimization method
Author(s): Wolfgang G. Luber
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Paper Abstract

The structural defects on aircraft are not directly monitored and indicated like hydraulic failures. The identification of structural damage is important for safety flights, but inspecting airplanes at regular intervals is very costly. A structural damage identification method is presented which examines the elastic and dynamic behavior of the structure by means of deflections stemming from a discrete load case and from normal mode shapes of the structure respectively as well as the information of the change of natural frequencies. The main objective of the study is to provide an economical and reliable damage detection method for aeronautical structures. An updated finite element model of the structure must be available. The reduced stiffness due to damage will be localized using non- linear mathematical optimization codes. Displacements for selected load cases and normal modes are taken as constraints. Minimum sizing changes with respect to the initial structure is used as objective function. Numerical examples with different structures show that the proposed method can accurately detect the variations in stiffness in certain cases.

Paper Details

Date Published: 28 January 1999
PDF: 12 pages
Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); doi: 10.1117/12.339908
Show Author Affiliations
Wolfgang G. Luber, DaimlerChrysler Aerospace AG (Germany)

Published in SPIE Proceedings Vol. 3586:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III
Ajit K. Mal, Editor(s)

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