Theoretical Considerations of Flutter at High Mach Numbers

Morgan, Homer G.; Runyan, H. L.; Huckel, Vera

doi:10.2514/8.7688

Cited by 23 publications

(15 citation statements)

References 5 publications

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“…There are several methods to approximate unsteady hypersonic aerodynamics, such as the piston theory (PT), 19) Van Dyke second-order theory (VD), 20) shock-expansion theory (SE), 21) unsteady Newtonian impact theory (NI), 22) and lifting surface/panel approaches. 23) Among them, shock-expansion theory and local piston theory (LPT) 22) are used to constitute the hypersonic analysis process.…”

Section: Aerodynamic Pressure Analysismentioning

confidence: 99%

Robust Aeroelastic Design Optimization of Hypersonic Wings Considering Uncertainty in Heat Flux

Wan

Yang

2017

Trans. Japan Soc. Aero. S Sci.

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A robust aeroelastic optimization design methodology for hypersonic wings considering uncertainty in heat flux is presented and applied to a design process of a typical hypersonic low-aspect-ratio wing. An interval analysis method is used to perform the transient heat transfer analysis with uncertainty in heat flux within the newly developed aerothermoelastic framework. A genetic algorithm is used to build the framework for robust optimization, and it is also used to determine the critical thermal load case from an interval temperature field obtained using interval heat transfer analysis. Aerothermoelastic analysis of the hypersonic wing shows that the structure may bear a severely worsening thermal environment when there is uncertainty in heat flux during hypersonic flight. Not merely the average temperature, but also the temperature gradient distribution of the structure rises, which might make designs created using deterministic analysis methods unreliable. Optimization results show that the robust optimization design methodology can provide a relatively light structural design and simultaneously make sure it is capable of satisfying multiple constraints under severe thermal environments with uncertainty.

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Section: Aerodynamic Pressure Analysismentioning

confidence: 99%

Robust Aeroelastic Design Optimization of Hypersonic Wings Considering Uncertainty in Heat Flux

Wan

Yang

2017

Trans. Japan Soc. Aero. S Sci.

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“…Commonly, the unsteady aerodynamics are approximated using either piston theory (PT) [56,57] or a similar Van Dyke second-order theory (VD) , which is essentially equivalent to second-order PT at hypersonic Mach numbers. However, other methods such as shockexpansion theory (SE) [60], unsteady Newtonian impact theory (NI) [61,62], and lifting surface/panel approaches [63,64] have also been employed. Each assumes inviscid hypersonic flow and neglects realgas effects.…”

Section: A Low-fidelity Modeling 1 Aerodynamic Pressurementioning

confidence: 99%

“…The static component of pressure was computed using the deflected mode shape, while the harmonic component was computed using either a transpiration boundary condition [100,101] or manipulation of the expression for wash velocity to relate surface geometry to surface velocity. In [71,99], a local PT (LPT) approach [61] was implemented to compute the unsteady generalized aerodynamic forces (GAFs) on lifting surfaces. In this approach, the freestream flow quantities in PT are replaced with local flow quantities computed using steady-state CFD.…”

Section: Reduced-order Modelingmentioning

confidence: 99%

Aeroelastic and Aerothermoelastic Analysis in Hypersonic Flow: Past, Present, and Future

2011

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is actively engaged in research on hypersonic aeroelasticity and aerothermoelasticity, multidisciplinary analysis and control of hypersonic vehicles, wind turbine aerodynamics and aeroelasticity, and turbomachinery aeromechanics. His research in hypersonic aeroelasticity and aerothermoelasticity was recognized with the 2004 ASME/Boeing Structures and Materials Award. He is currently a Senior Member of the AIAA.

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“…The majority of studies on hypersonic aeroelasticity have used either piston theory, 34,35 or a similar second order theory developed by Van Dyke. 36,37 However, some other methods, such as unsteady shock-expansion theory 38 and unsteady Newtonian-Impact theory, 39,40 have also been employed. Each of these methods assume inviscid hypersonic flow and neglect real gas effects.…”

Section: A Approximate Unsteady Hypersonic Aerodynamicsmentioning

confidence: 99%

“…1 Unsteady Newtonian-Impact aerodynamics provide a simple manner to handle extremely high Mach number flows, and/or portions of the flow largely inclined to the surface of a body. 14,39,51,53…”

Section: Unsteady Newtonian-impact Theorymentioning

confidence: 99%

Aeroelastic and Aerothermoelastic Analysis of Hypersonic Vehicles: Current Status and Future Trends

McNamara

Friedmann

2006

14th AIAA/AHI Space Planes and Hypersonic Systems and Technologies Conference

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A review of the state-of-the-art in hypersonic aeroelasticity and aerothermoelasticity is provided. Recently, the main focus in this area has been on the development of computational aeroelastic and aerothermoelastic methods capable of studying complete hypersonic vehicles. Thus, in addition to a survey of studies conducted in this area over the past six decades, two important issues are a focus of this review, namely: 1) modeling unsteady hypersonic aerodynamics; and 2) incorporation of the heat transfer between the fluid and the structure into the aeroelastic solution process. Finally, future directions of hypersonic aeroelasticity and aerothermoelasticity are outlined. Since air-breathing hypersonic vehicles exhibit strong coupling between the airframe, propulsion, and control systems, future directions point to the incorporation of advanced computational aerothermoelastic methods into a comprehensive vehicle analysis.

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Theoretical Considerations of Flutter at High Mach Numbers

Cited by 23 publications

References 5 publications

Robust Aeroelastic Design Optimization of Hypersonic Wings Considering Uncertainty in Heat Flux

Robust Aeroelastic Design Optimization of Hypersonic Wings Considering Uncertainty in Heat Flux

Aeroelastic and Aerothermoelastic Analysis in Hypersonic Flow: Past, Present, and Future

Aeroelastic and Aerothermoelastic Analysis of Hypersonic Vehicles: Current Status and Future Trends

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