COUPLED REDUCED ORDER MODEL-BASED STRUCTURAL-THERMAL PREDICTION OF HYPERSONIC PANEL RESPONSE

Andrew Matney; S. Michael Spottswood; Marc Paul Mignolet; Adam Culler; Jack McNamara

University of Southampton OCS (beta), RASD 2013 11th International Conference on Recent Advances in Structural Dynamics 1st – 3rd July 2013

Andrew Matney, S. Michael Spottswood, Marc Paul Mignolet, Adam Culler, Jack McNamara

Last modified: 2013-05-17

Abstract

This paper addresses some aspects of the development of a fully coupled thermal-structural reduced order modeling of planned hypersonic vehicles, most notably the construction of the thermal and structural bases. A general framework for this construction is presented and demonstrated on a representative panel considered in prior investigations. The thermal reduced order model is first developed using basis functions derived from appropriate conduction eigenvalue problems. This basis is validated using published data of which it is found to provide an accurate representation. The coupling of this thermal model with a recently developed nonlinear structural reduced order model of the same panel is next considered. This coupling requires first the enrichment of the structural basis to model the elastic deformations that may be produced consistently with the thermal reduced order model. This step is detailed for the present panel and then the temperature dependent coefficients of the structural model are determined. The validation of the combined structural-thermal reduced order model is carried out by comparison with full finite element results (Nastran here) corresponding to pure mechanical loads, pure thermal loads, and combined mechanical-thermal excitations. Such comparisons are performed here on static solutions with temperature increases up to 2700R and pressures up to 3 psi for which the maximum displacements are of the order of 3 thicknesses. The reduced order model predicted results agree well with the full order finite element predictions in all of these various cases.

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