Artificial boundary conditions for finite element model update and damage detection
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Authors
Damanakis, Emmanouil
Subjects
artificial boundary conditions
finite element model
model update
damage identification
natural frequencies
sensitivity matrix
finite element model
model update
damage identification
natural frequencies
sensitivity matrix
Advisors
Gordis, Joshua H.
Date of Issue
2017-03
Date
Mar-17
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
In structural engineering, a finite element model is often used to estimate its dynamic or static behavior, and in conjunction with measured data, to monitor the health of a structure. This research is focusing on the use of experimental data for the improvement of a finite element model such that it accurately represents the structure, and in the localization of artificial damage in the model. The method of Artificial Boundary Conditions in model update and damage identification is used. To update the finite element model, identified stiffness changes are typically applied at each element of the model. This research introduces and demonstrates a new method using the mean stiffness correction at every element, to produce improved prediction of natural frequencies. The use of this method in conjunction with a composite sensitivity matrix created from the application of artificial boundary conditions, and utilizing the higher modes, is shown to more accurately update the finite element model than the usual method. Furthermore, this research demonstrates a new method for damage identification that uses subtraction of residual stiffness values, which can identify the damage regardless of location.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Identifiers
NPS Report Number
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Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner.