Initial forms of analytical models created to simulate real engineering structures
may generally yield dynamic response predictions different than those obtained
from experimental tests. Since testing a real structure under every possible
excitation is not practical, it is essential to transform the initial mathematical
model to a model which reflects the characteristics of the actual structure in a
better way. By using structural model updating techniques, the initial
mathematical model is adjusted so that it simulates the experimental
measurements more closely.
In this study, a sensitivity-based finite element (FE) model updating method
using experimental frequency response (FRF) data is presented. This study bases
on a technique developed in an earlier study on the computation of the so-called
Mis-correlation Index (MCI) used for identifying the system matrices which
require updating. MCI values are calculated for each required coordinate, and
non-zero numerical values indicate coordinates carrying error. In this work a
new model updating procedure based on the minimization of this index is
developed. The method uses sensitivity approach. FE models are iteratively
updated by minimizing MCI values using sensitivities. The validation of the
method is realized through some case studies. In order to demonstrate the
application of the method for real systems, a real test data obtained from the
modal test of a scaled aircraft model (GARTEUR SM-AG19) is used. In the
application, the FE model of the scaled aircraft is updated. In the case studies
the generic software developed in this study is used along with some
commercial programs.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/2/12610608/index.pdf |
| Date | 01 May 2009 |
| Creators | Ozturk, Murat |
| Contributors | Ozguven, H. Nevzat |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for METU campus |
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