Minimum condition number by orthogonal projection row selection of artificial boundary conditions for finite element model update and damage detection
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Authors
Gordis, Joshua H.
Shin, Jae-Cheol
Bouwense, Matthew D.
Subjects
Finite element model
Structural damage detection
Update
Artificial boundary conditions
Orthogonal projection
Sensitivity matrix
Structural damage detection
Update
Artificial boundary conditions
Orthogonal projection
Sensitivity matrix
Advisors
Date of Issue
2018-07-20
Date
20 July 2018
Publisher
Elsevier
Language
Abstract
The method of artificial boundary conditions provides a way of significantly expanding the
amount of useable data for performing model update or damage detection. It accomplishes
this by artificially applying boundary conditions directly to the measured frequency
response functions, which can then be curve fit to obtain the modal parameters. A critical
task in the application of this method is the selection of modes from a large available set of
candidate modes generated by the application of various artificial boundary conditions. An
orthogonal projection procedure is used to select modes from which to build a composite
sensitivity matrix of minimum condition number for update and damage detection. Both
simulation and experiment are used to investigate this method. The experimental study
makes use of two beams, identical except for damage installed in one beam. Issues
regarding the number and type of artificial boundary conditions, the synthesis of boundary
conditions, and test frequency resolution are studied. Both the simulation and the
experiment reveal that model updating and damage detection can be accomplished with
high accuracy
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1016/j.jsv.2018.07.006
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
19 p.
Citation
Gordis, Joshua H., Jae-Cheol Shin, and Matthew D. Bouwense. "Minimum condition number by orthogonal projection row selection of artificial boundary conditions for finite element model update and damage detection." Journal of Sound and Vibration 433 (2018): 179-197.
Distribution Statement
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.