Many air-breathing hypersonic aerospacecraft design concepts incorporate an elongated fuselage forebody acting as the aerodynamic compression surface for a hypersonic combustion module, or scramjet. This highly integrated design approach creates the potential for an unprecedented form of aero-propulsive-elastic interaction in which deflections of the vehicle fuselage give rise to propulsion transients, producing force and moment variations that may adversely impact the rigid body flight dynamics and/or further excite the fuselage bending modes. To investigate the potential for such interactions, a math model was developed which included the longitudinal flight dynamics, propulsion system, and first seven elastic modes of a hypersonic air-breathing vehicle. Perturbation time histories from a simulation incorporating this math model are presented that quantify the propulsive force and moment variations resulting from aeroelastic vehicle deflections. Root locus plots are presented to illustrate the effect of feeding the propulsive perturbations back into the aeroelastic model. A concluding section summarizes the implications of the observed effects for highly integrated hypersonic air-breathing vehicle concepts.
Impact of aeroelasticity on propulsion and longitudinal flight dynamics of an air-breathing hypersonic vehicle
Der Einfluß der Aeroelastizität auf den Vortrieb und die Flugdynamik im Längsflug eines Hyperschallflugzeugs
1993
10 Seiten, 13 Bilder, 1 Tabelle, 15 Quellen
Aufsatz (Konferenz)
Englisch
Raumfahrttechnik , Luftfahrttechnik , Flugzeug , Hyperschallgeschwindigkeit , Aerodynamik , Schubkraft , Auslegung (Dimension) , Entwurfsparameter , Flugzeugrumpf , Überschallstaustrahltriebwerk , Betriebsverhalten , Biegefestigkeit , technische Entwicklung , Versuchsmethode , Rechenmodell , Simulationsmodell , technische Beschreibung
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