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Variable Complexity Structural Optimization of ShellsStructural designers today face both opportunities and challenges in a vast array of available analysis and optimization programs. Some programs such as NASTRAN, are very general, permitting the designer to model any structure, to any degree of accuracy, but often at a higher computational cost. Additionally, such general procedures often do not allow easy implementation of all constraints of interest to the designer. Other programs, based on algebraic expressions used by designers one generation ago, have limited applicability for general structures with modem materials. However, when applicable, they provide easy understanding of design decisions trade-off. Finally, designers can also use specialized programs suitable for designing efficiently a subset of structural problems. For example, PASCO and PANDA2 are panel design codes, which calculate response and estimate failure much more efficiently than general-purpose codes, but are narrowly applicable in terms of geometry and loading. Therefore, the problem of optimizing structures based on simultaneous use of several models and computer programs is a subject of considerable interest. The problem of using several levels of models in optimization has been dubbed variable complexity modeling. Work under NASA grant NAG1-1808 has been concerned with the development of variable complexity modeling strategies with special emphasis on response surface techniques. In addition several modeling issues for the design of shells of revolution were studied.
Document ID
19990063890
Acquisition Source
Langley Research Center
Document Type
Contractor or Grantee Report
Authors
Haftka, Raphael T. (Florida Univ. Gainesville, FL United States)
Venkataraman, Satchi (Florida Univ. Gainesville, FL United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1998
Subject Category
Structural Mechanics
Funding Number(s)
CONTRACT_GRANT: NAG1-1808
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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