Flight-Testing of a Low-Cost Precision Aerial Delivery System

Gilles, Brian; Hickey, Michael P.; Krainski, Walter J.

doi:10.2514/6.2005-1651

Cited by 17 publications

(6 citation statements)

References 1 publication

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“…(3) and an implementation of the terminal velocity expression in Eqs. (4)(5)(6). Figure 2 shows the descent rate as a function of time for both the numerical integration and the simpler terminal velocity simulations.…”

Section: A Vertical Motionmentioning

confidence: 99%

“…An early concept used a deformable circular parachute actuated via pneumatics [1][2][3] to provide rudimentary horizontal steering by simply straining the suspension lines to deform the canopy, resulting in glide slopes of up to 0.5. Because of the large mass of the system (from the need for large amounts of compressed nitrogen gas), other more feasible options were pursued, including electromechanically deformed parachutes [4,5].…”

mentioning

confidence: 99%

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Time-Varying Descent Rate Control Strategy for Circular Parachutes

Fields

LaCombe

Wang

2015

Journal of Guidance, Control, and Dynamics

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This paper presents a time-varying control methodology for a variable-sized circular parachute to reach a target landing location. A trajectory is calculated for the immediate control horizon using wind forecast data. To create a parachute-payload trajectory, a three-degree-of-freedom kinematic model is developed. Using this, the performance envelope is determined, revealing the potential target range of the system during a descent. Next, this model is further developed into a control methodology to determine the necessary descent rate, to reach the desired landing target, to be controlled via parachute size manipulation. Finally, simulation results are presented to validate the control scheme. Various release locations were simulated with paired uncontrolled/controlled parachute descents from within the performance envelope. Results demonstrate the feasibility of the system, with controlled parachute descents actively navigating toward the target. With accurate wind data, the vehicle can overcome release location errors as well as vehicle uncertainties and perform significantly better than an uncontrolled parachute in reaching targeted landing locations.

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Section: A Vertical Motionmentioning

confidence: 99%

mentioning

confidence: 99%

Time-Varying Descent Rate Control Strategy for Circular Parachutes

Fields

LaCombe

Wang

2015

Journal of Guidance, Control, and Dynamics

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“…A detailed discussion of all the testing performed during this period is contained in Ref. 4. The results of these demonstrations are briefly summarized here.…”

Section: Parafoil With Brake Actuation Agas -Controlled Round Parachutementioning

confidence: 99%

“…The development of AGAS 2000 has been well documented. [2][3][4] This paper focuses on its concept of operation (CONOPS) in a tactical environment, its compatibility with the new Air Force airdrop mission planner (PADS), and current plans to expand AGAS to a range of systems for payloads from 200 to 10,000 lb using a common system architecture.…”

Section: Introductionmentioning

confidence: 99%

“…Guided Parafoil Airdrop System.B. AGAS 2000 Demonstrated PerformanceAs documented in Ref 4,. AGAS 2000 underwent an extensive series of demonstration and validation testing during the yearlong period leading up to and through the delivery of the first five production-representative systems American Institute of Aeronautics and Astronautics to the US Army in April 2005.…”

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confidence: 99%

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The AGAS 2000 Precision Airdrop System

Jorgensen¹,

Hickey

2005

Infotech@Aerospace

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The requirement for airdropping critical military and relief supplies from high altitude has existed since the advent of long-range, ground-based, anti-aircraft armaments. Aircrews understandably want to fly above the threat of anti-aircraft fire when operating in hostile environments. Advances in just the past five years in navigation, guidance, and control electronics based on the Global Positioning System (GPS), and improvements in the measurement and forecasting of in-situ winds have made the active control of cargo parachutes a relatively affordable and reliable method of compensating for wind drift. Where a ballistic (uncontrolled) round parachute cargo resupply system delivered from high altitude might drift thousands of meters off target, modern autonomously controlled cargo parachute systems can compensate for winds aloft and command the parachute to within a few tens of meters of the designated target. One such system is the 2,000-lb class Affordable Guided Airdrop System-AGAS 2000. Unique among precision airdrop parachute systems, AGAS 2000 integrates a relatively inexpensive autopilot controller with a military inventory round cargo parachute and inventory cargo sling assembly to convert a standard one-ton cargo delivery system into a precision airdrop system. AGAS 2000 can deliver a one-ton payload to within 211 m circular error probable (CEP) of its target when its programmed mission profile is based on forecast winds and to within 38 m CEP when based on a current wind profile provided by a system such as the Air Force's Precision Airdrop System (PADS).

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The use of a steerable single-actuator cruciform parachute for targeted payload return

Fields

Yakimenko

2017

2017 IEEE Aerospace Conference

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Flight-Testing of a Low-Cost Precision Aerial Delivery System

Cited by 17 publications

References 1 publication

Time-Varying Descent Rate Control Strategy for Circular Parachutes

Time-Varying Descent Rate Control Strategy for Circular Parachutes

The AGAS 2000 Precision Airdrop System

The use of a steerable single-actuator cruciform parachute for targeted payload return

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