Defining the Aerothermodynamic Methodology

Neumann, Richard D.

doi:10.1007/978-1-4684-9187-6_4

Cited by 9 publications

(2 citation statements)

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“…Maneuvers that require holding constant g values for an extended period of time, such as steady level turns and long climbs, would place severe heating stresses on the deflected flaps. 9 The aim is therefore to "wash out" the body flaps and at the same time retain the commanded g values by increasing lift using the elevons to control the angle of attack.…”

Section: Gaf Control Strategymentioning

confidence: 99%

“…Many control strategies are possible, but the architecture Presented as Paper 93-3814 at the AIAA Guidance, Navigation, and Control Conference, Monterey, CA, Aug. [9][10][11]1993; received June 16, 1993; revision received Jan. 27,1994; accepted for publication May 7,1994 chosen here focuses on the key hypersonic issues discussed above and is justified in a step-by-step manner for practical implementation. Given the architecture, the compensation is obtained by classical means.…”

Section: Introductionmentioning

confidence: 99%

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Direct-lift design strategy for longitudinal control of hypersonic aircraft

Biezad

1994

Journal of Guidance, Control, and Dynamics

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A longitudinal control design called the G-command, alpha follow-up is described that significantly improves the lag between pitch angle and flight-path angle responses associated with hypersonic flight. The design technique relies on classical, successive loop closures to determine the control architecture and introduces a direct-lift control strategy to design dynamic compensation. This dynamic compensation constrains and "washes out" body-flap input to avoid excessive flap deflection and associated heating while providing angle-of-attack control at the engine inlet. The final design was implemented on a generic hypersonic aircraft simulation at NASA Dryden and evaluated by a NASA test pilot familiar with the SR-71. The pilot flew turning and altitude change maneuvers using the implemented control law and verified the ability to track flight path with ease and precision. Finally, evidence is presented that supports a flying qualities metric for longitudinal, hypersonic flight based on the bandwidth of the flight-path-angle-to-stick-frequency response.

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Section: Gaf Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%