Aeroelastic and Aerothermoelastic Behavior in Hypersonic Flow
Jack J. McNamara,Jack J. McNamara,Peretz P. Friedmann,Kenneth G. Powell,B. J. Thuruthimattam,Robert E. Bartels +5 more
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In this article, the authors performed a systematic computational study of the hypersonic aeroelastic and aerothermoelastic behavior of a three-dimensional configuration of a low-aspect-ratio wing.Abstract:
The testing of aeroelastically and aerothermoelastically scaled wind-tunnel models in hypersonic flow is not feasible; thus, computational aeroelasticity and aerothermoelasticity are essential to the development of hypersonic vehicles. Several fundamental issues in this area are examined by performing a systematic computational study of the hypersonic aeroelastic and aerothermoelastic behavior of a three-dimensional configuration. Specifically, the flutter boundary of a low-aspect-ratio wing, representative of a fin or control surface on a hypersonic vehicle, is studied over a range of altitudes using third-order piston theory and Euler and Navier-Stokes aerodynamics. The sensitivity of the computational-fluid-dynamics-based aeroelastic analysis to grid resolution and parameters governing temporal accuracy are considered. In general, good agreement at moderate-to-high altitudes was observed for the three aerodynamic models. However, the wing flutters at unrealistic Mach numbers in the absence of aerodynamic heating. Therefore, because aerodynamic heating is an inherent feature of hypersonic flight and the aeroelastic behavior of a vehicle is sensitive to structural variations caused by heating, an aerothermoelastic methodology is developed that incorporates the heat transfer between the fluid and structure based on computational-fluid-dynamics-generated aerodynamic heating. The aerothermoelastic solution procedure is then applied to the low-aspect-ratio wing operating on a representative hypersonic trajectory. In the latter study, the sensitivity of the flutter margin to perturbations in trajectory angle of attack and Mach number is considered. Significant reductions in the flutter boundary of the heated wing are observed. The wing is also found to be susceptible to thermal buckling.read more
Citations
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Proceedings ArticleDOI
Uncertainty Propagation in Hypersonic Aerothermoelastic Analysis
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Nonlinear Theoretical Aeroelastic Model of a Plate: Free to Fixed In-Plane Boundaries
Maxim Freydin,Earl H. Dowell +1 more
TL;DR: In this paper, the nonlinear response of a beam or plate is sensitive to the assumptions made about the in-plane boundary constraints, and this is true for any static or dynamic loading.
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Nonlinear aeroelastic analysis of the folding fin with freeplay under thermal environment
TL;DR: In this article, the authors investigated the nonlinear aeroelastic behavior of a folding fin in supersonic flow and developed an improved fixed-interface modal synthesis method, which can reduce the rigid connections at the interface.
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Computational aeroelastic studies of a generic hypersonic vehicle
TL;DR: In this article, a generic hypersonic vehicle with a lifting-body type fuselage and canted fins is studied using third order piston theory and Euler aerodynamics. And the results of the simulation were compared with those from nonlinear piston theory solutions for a variety of flight conditions.
Proceedings ArticleDOI
Coupled Analysis of Aerodynamic Heating, Radiative Heat Transfer and Heat Conduction for Hypersonic Vehicles
Chen Xin,Li Liu,Zhenjiang Yue +2 more
TL;DR: In this article, an integrated coupled analysis methodology for the temperature environment prediction under combined aerodynamic heating, radiative transfer and structure heat conduction is proposed. But the integrated coupled approach is used to obtain the temperature of the typical control surface for a representative hypersonic trajectory.
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