The Affordable Guided Airdrop System (AGAS)

Brown, Glen; Haggard, Roy; Almassy, Richard; Benney, Richard; Dellicker, Scott

doi:10.2514/6.1999-1742

Cited by 32 publications

(11 citation statements)

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“…The rate of change of position in an inertial reference frame is the transformation of body referenced velocity as (1) where -inertial position vector (down range, cross range and altitude) -body to inertial transformation matrix -body referenced relative velocity vector…”

Section: Positionmentioning

confidence: 99%

“…Ongoing research and development, with recent flight tests of an Affordable Guided Airdrop System (AGAS), have shown that a parachute's trajectory can be controlled with contracting Pneumatic Muscle Actuators 1 . Earlier development and demonstrations of Precision Guided Airdrop System (PGAS) for a ram-air parafoil incorporated an Inertial Navigation System aided with the Global Positioning System (INS/GPS) to provide navigation data for parafoil guidance 2 .…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic Parameter Estimation for Controlled Parachutes

Rogers

2002

AIAA Atmospheric Flight Mechanics Conference and Exhibit

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An extended Kalman filter algorithm implementation is used to estimate the aerodynamic, wind, mass property and measurement errors for controlled low-glide parachutes. This implementation incorporates two new approaches: 1) an alternate attitude error model formulation to overcome mathematical singularities associated with vertical flight, and 2) apparent mass characteristics used to describe a parachute's unsteady aerodynamic characteristics. Results based on simulated data show that aerodynamic characteristics and winds can be estimated separately from the apparent mass coefficients.

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Section: Positionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aerodynamic Parameter Estimation for Controlled Parachutes

Rogers

2002

AIAA Atmospheric Flight Mechanics Conference and Exhibit

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“…These include (1) a soft-landing airdrop system, and (2) a low cost steerable airdrop system [6,7]. In general, the relationship between PMA internal pressure, length, and force is nonlinear.…”

Section: • An Accurate and Efficient Element Was Developed For Modelimentioning

confidence: 99%

“…To date, the study of such phenomena has been extremely limited. The CSD model developed under this project provides an effective tool to study this complex problem New soft landing airdrop systems that utilize PMAs as a retraction device have recently been developed and are currently being evaluated [6]. In these systems, a PMA is attached between the confluence point and payload, as shown in Figure A3.…”

Section: Simulation Of Contact During Inflation Of a Round Canopymentioning

confidence: 99%

Advanced Structural Modeling for Fully Coupled Parachute Dynamics

Accorsi¹,

Leonard²

2002

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. -EG SUPPLEMENTARY NOTESThe views, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other documentation. The goal of this project has been to advance the state-of-the-art in performing fluid-structure interaction (FSI) simulations of parachute systems. This capability is being used by the Army to evaluate the dynamic behavior of new and existing airdrop systems. Airdrop systems have traditionally been designed using semi-empirical methods supplemented by extensive testing, which is time consuming and expensive. Computer simulation provides a cost effective alternative to this approach.FSI simulations of airdrop systems require coupling of computational structural and fluid dynamics models. These simulations are very computationally intensive and therefore parallel computational methods are essential. Specifics objectives addressed under this project focused on both the structural mechanics and parallel requirements; the required fluid dynamics component has been performed collaboratively at Rice University under a separate effort.

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“…The resultant body-axis error P b is then used to identify which control input must be activated as shown in Eq. (2).…”

Section: Control Systemmentioning

confidence: 99%

Guidance and Control for Flat-Circular Parachutes

Dellicker

Benney

Brown³

2001

Journal of Aircraft

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The Affordable Guided Airdrop System (AGAS) is being evaluated as a low-cost alternative for meeting the military's requirements for precision airdrop. Designed to bridge the gap between relatively expensive high-glide ratio parafoil systems and uncontrolled ballistic parachutes, the AGAS concept offers the bene ts of high-altitude parachute releases as well as the potential for highly accurate point-of-use delivery of material. The design goal of the AGAS development is to provide a guidance, navigation, and control system that can be placed in line with cargo parachute systems, for example the G-12 at-circular parachute, and standard delivery containers (A-22) without modifying these elded systems. The AGAS is required to provide an accuracy of 328 ft (100 m), circular error probable (CEP), with a desired goal of 164 ft (50 m) CEP. The feasibility of this concept was investigated through modeling and simulation. A three-degree-of-freedom (3DOF) point mass ight dynamics model, sensor models of a commercial global positioning system (GPS) receiver and magnetic compass, and a model of the control and actuator system were incorporated into a Monte Carlo simulation tool. A bang-bang controller was implemented with trajectory tracking algorithms using position and heading information. Flight testing, using a radio-controlled scaled prototype, provided parachute dynamic and control response data to support the modeling efforts. The study demonstrated that this concept has the potential to provide control of previously unguided round parachutes to accuracies of approximately 210 ft (64 m) CEP. The program is now continuing into the next phase to include the development of a full-scale prototype system for payloads up to 2200 lb (1000 kg).

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The Affordable Guided Airdrop System (AGAS)

Cited by 32 publications

References 0 publications

Aerodynamic Parameter Estimation for Controlled Parachutes

Aerodynamic Parameter Estimation for Controlled Parachutes

Advanced Structural Modeling for Fully Coupled Parachute Dynamics

Guidance and Control for Flat-Circular Parachutes

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