The Dragonfly 4,500 kg Class Guided Airdrop System

George, Sean; Carter, David; Berland, Jean-Christophe; Dunker, Storm; Tavan, Steven; Barber, Justin

doi:10.2514/6.2005-7095

Cited by 11 publications

(4 citation statements)

References 1 publication

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“…Autonomous-guided airdrop systems based on steerable, ram-air parafoils were developed with the goal of improving the precision and accuracy of air-dropped payload delivery. These systems use trailing edge (TE) brake deflection for control [1][2][3][4][5][6][7][8][9]. Differential brake deflection produces lateral control.…”

Section: Introductionmentioning

confidence: 99%

Parafoil Control Authority with Upper-Surface Canopy Spoilers

Gavrilovski

Ward

Costello

2012

Journal of Aircraft

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Section: Introductionmentioning

confidence: 99%

Parafoil Control Authority with Upper-Surface Canopy Spoilers

Gavrilovski

Ward

Costello

2012

Journal of Aircraft

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“…These systems use trailing edge brake deflection for control [1][2][3][4][5][6][7][8][9]. Differential brake deflection produces lateral control.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Effects of Parafoil Upper Surface Bleed Air Actuation

Bergeron

Ward

Costello

2012

AIAA Atmospheric Flight Mechanics Conference

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Control of the glide slope of parafoil and payload aircraft is limited with current control mechanisms, which makes the precision landing of autonomous systems extremely challenging. The incorporation of bleed air vents into the upper surface of the parafoil canopy to create aerodynamic spoilers has been shown to be an extremely effective means of obtaining a wide range of glide slope control with minimal actuation effort and complexity. The current work presents physical insight into these novel control mechanisms through a combination of computational fluid dynamic simulation and wind tunnel testing. Nomenclature= ratio of specific heats L/D = glide ratio = dynamic viscosity R = gas constant for dry air = density V = local fluid velocity ω = vorticity

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“…The usual means to create some semblance of altitude control is through a weaving maneuver back and forth across a desired trajectory path to "dump" altitude as progress is made along the desired path. [3][4][5][6][7][8][9][10] Near the intended ground impact location, current autonomous systems either spiral over the target or S-turn to the target. A key to the success for these algorithms is accurate descent rate estimation which is difficult to accomplish and prone to error.…”

Section: Introductionmentioning

confidence: 99%

Use of Dynamic Incidence Angle for Glide Slope Control of Autonomous Parafoils

Slegers

Beyer

Costello

2007

19th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

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Strickly speaking, most autonomous parafoil and payload aircraft possess only lateral control, achieved by right and left parafoil brake deflection. An innovative new technique to achieve direct longitudinal control through dynamic incidence angle changes is reported. Addition of this extra control channel requires simple rigging changes and an additional servo actuator. The ability of dynamic incidence angle to alter the glide slope of a parafoil and payload aircraft is demonstrated through a flight test program with a micro parafoil system. Results from the flight test program are synthesized and integrated into a 6 degreeof-freedom simulation. The simulation model is subsequently used to assess the utility of glide slope control to improve autonomous flight control system performance. Through Monte Carlo simulation, impact point statistics with and without glide slope control indicate that dramatic improvements in impact point statistics are possible using direct glide slope control. , , u v w = Velocity components of mass center in a body reference frame., , p q r = Angular velocity components in a body reference frame. Γ= Canopy incidence angle.

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The Dragonfly 4,500 kg Class Guided Airdrop System

Cited by 11 publications

References 1 publication

Parafoil Control Authority with Upper-Surface Canopy Spoilers

Parafoil Control Authority with Upper-Surface Canopy Spoilers

Aerodynamic Effects of Parafoil Upper Surface Bleed Air Actuation

Use of Dynamic Incidence Angle for Glide Slope Control of Autonomous Parafoils

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