Numerical Modeling of Inverse Problems for Damage Detection in Aircraft Structures
Final rept. 12 Jan 2006-30 Nov 2009
UNIVERSIDADE FEDERAL DE ITAJUBA (BRAZIL) FUNDACAO DE APOIO AO ENSINO-PESQUISA E EXTENSAO DE ITAJUBA
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Structural health monitoring SHM is a competitive approach for damage detection in aircraft structures, wherein online information is collected and compared with an existing database for the undamaged structure, to obtain real-time information about the presence of damage. The goal of this research is to develop numerical models of inverse problems for damage detection in aircraft structures, which could later be part of an on-board system for SHM. In this work, the numerical modeling has two main branches 1 The direct problem a model is required to obtain information on the distribution of the quantity of interest throughout a given damaged structure. The model of the direct problem, using the boundary element method BEM, is expected to reproduce the reality of an aircraft structure. 2 The inverse problem a model is required to locate the structural damage given the information on the quantity of interest at particular locations sensor locations. To increase the reliability of the detection approach, a combination of independent optimization and identification procedures can be used. Some treatment of the model uncertainties is required, due to the stochasticity in the problem variables and parameters.
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