Project Title:

Grid Optimization Tools for Complex Structural Models

92-1-11.07-2246                                                   NAS08-39822
Grid Optimization Tools for Complex Structural
     Models
Alabama Research
7809 Doubletree Lane
Huntsville, AL  35802
Lawrence W. Spradley                                 (205-883-2246)

Abstract:

     Computer software for optimizing finite-element grids used in
complex structural models will be developed. The grid optimization
tools will operate directly on existing models from standard
industry and government codes. The new software will extend
existing packages and will act as a stand-alone processor to
optimize, remesh, and perform special functions and then replace
the grid on a compatible file for reprocessing by the finite
element package. The result will be a higher quality grid that has
a more accurate and reliable stress analysis and vehicle component
design. By using the automatic optimizer code, NASA can conduct
more accurate structural analyses and introduce special functions
such as flaws, holes, and weld misalignment. Phase I will test and
verify the grid optimizer tools by using two-dimensional models
and theories. Extension of the methods to three dimensions will be
investigated. Phase II will further extend the software to three-
dimensional tetrahedral and hexahedral grids. A comprehensive test
problem set will then be selected in conjunction with NASA and the
results analyzed and compared to previous solutions and test data.
Phase II will end when the software and documentation is delivered
to NASA.

Potential Commercial Application:

Potential Commercial Applications:  The grid optimization tool
will be used by aerospace, mechanical, and civil engineers in all
disciplines who design high-rise buildings, analyze damaged
buildings, perform fatigue analyses of commercial airplanes,
design bridge structures, and perform safety analyses of dams,
bridges, highways, and automobiles.

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