Date of Award
Spring 1992
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Mechanical & Aerospace Engineering
Program/Concentration
Engineering Mechanics
Committee Director
Gene J.-W. Hou
Committee Member
Nahil Sobh
Committee Member
Chuh Mei
Call Number for Print
Special Collections; LD4331.E57B37
Abstract
Reanalysis is a numerical analysis technique that uses results from the total analysis of a design to compute the new response at a reduced computational cost. While there are many techniques available for reanalysis, the first order perturbation technique is investigated in this study. Because of its wide use in industry, NASTRAN finite element analysis software is used for total analysis, and as a basis for error. Since error seems rather unpredictable for this technique, it is sought, in this thesis, to find a reliable index for error so that a designer can know when the technique can be trusted.
The design model used is a cantilever plate with 100 quadrilateral elements. The reanalysis technique is used to predict the new eigenvalue of the plate when one element is removed. Error is analyzed by running reanalysis for several elements on a row of elements, and graphing error as a function of the distance from the fixed end of the plate.
It is concluded that strain energy, which is easily obtainable from the reanalysis code and from NASTRAN, is a good index for error for the plane stress case, and for the plate bending case. It is also observed that a color contour plot of strain energy, obtained from a postprocessor, could be useful for identifying areas of potentially high error.
Rights
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DOI
10.25777/yf2r-zg91
Recommended Citation
Barton, Christopher B..
"Eigenvalue Reanalysis Techniques Using MSC/NASTRAN"
(1992). Master of Science (MS), Thesis, Mechanical & Aerospace Engineering, Old Dominion University, DOI: 10.25777/yf2r-zg91
https://digitalcommons.odu.edu/mae_etds/406