Some aspects of algorithm performance and modeling in transient analysis of structures

AbstractThe status of an effort to increase the efficiency of calculating transient temperaturefields in complex aerospace vehicle structures is described. The advantages and dis­advantages of explicit and implicit algorithms with variable time steps, known as theGEAR package is described. Four test problems, used for evaluating and comparingvarious algorithms, have been selected and finite-element models of the configurationsare described. These problems include a Space Shuttle frame component, an insulatedcylinder, a metallic panel for a thermal protection system, and a model of the SpaceShuttle Orbiter wing. Results generally indicate a preference for implicit overexplicit algorithms for solution of transient structural heat transfer problems whenthe governing equations are "stiff" (typical of many practical problems such asinsulated metal structures). 17. Key Words (Suggested by Author(s))Heat transferFinite elementTransient thermal analysisThermal modeling 18. Distribution StatementUnclassified - UnlimitedSubject Category 34

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