Synthetic modifications in the frequency domain for finite element model update and damage detection
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Authors
Konze, Ryun J.C.
Subjects
artificial boundary conditions
artificial beam modification
finite element model
model update
damage identification
natural frequencies
sensitivity matrix
artificial beam modification
finite element model
model update
damage identification
natural frequencies
sensitivity matrix
Advisors
Gordis, Joshua H.
Date of Issue
2017-09
Date
Sep-17
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
Sensitivity-based finite element model updating and structural damage detection has been limited by the number of modes available in a vibration test and also by the corresponding amount of natural frequency sensitivity data. The method of Artificial Boundary Conditions (ABC) has been shown to greatly increase the number of modes and corresponding sensitivity data by artificially constraining the structure under test, producing a large number of alternative test configurations and associated sensitivity data. This thesis explores an extension of this concept by the application of synthetic structural modifications to the measured data, including both springs-to-ground and mass modifications. This is accomplished with frequency domain structural synthesis. The ability of this technique to generate additional sensitivity data for use in model update and damage detection is explored and compared with the use of Artificial Boundary Conditions. Frequency response functions from a simulated damaged structure are used as well as measured frequency response functions from a lab-scale damaged structure.
Type
Thesis
Description
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
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NPS Report Number
Sponsors
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Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.