Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"Formation Flight"”.
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Spacecraft formation flight exploiting potential fields
… fields are exploited such that spacecraft formation can be held with as little effort as possible. The first potential field considered is the Earth's gravitational field. Based upon the sparse aperture radar requirements, the terminal conditions required to keep the Air Force TechSat 21 …
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Electromagnetic formation flight of satellite arrays
… arrays use propellant as a reaction mass. For formation flying systems, propellant becomes a critical consumable which can be quickly exhausted while maintaining relative orientation. Furthermore, the total required propellant mass is highly dependant on [delta]V, which requires propellant mass …
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Electromagnetic formation flight dipole solution planning
Electromagnetic Formation Flight (EMFF) describes the concept of using electromagnets (coupled with reaction wheels) to provide all of the necessary forces and torques needed to maintain a satellite's relative position and attitude in a formation of satellites. With EMFF, this formation can be …
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Wing trailing vortex paths in formation flight
Formation flight has been shown to reduce the induced drag for a formation of aircraft. The mechanism by which this is achieved is caused by the wake velocity field of the aircraft. This field is dominated by wing-tip trailing vortices. The paths of these vortices become too complex for rigid wake …
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Micro-electromagnetic formation flight of satellite systems
Electromagnetic formation flight (EMFF) investigates the concept of using electromagnets to provide the forces to maintain a satellite's relative position in a formation. Thus far, high temperature superconducting (HTS) wire has been considered the enabling technology and the concept has been sized …
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Passenger comfort during formation flight within atmospheric turbulence
Formation flight is currently being investigated as a means to reduce drag and improve fuel efficiency in commercial aviation. In light of this, the potential for passenger discomfort due to the formation flying through free air turbulence was considered in this study. In an attempt to …
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Spacecraft formation flight at sun-earth/moon libration points
<p>"Formations of spacecraft, positioned near the libration points of the Sun- Earth/Moon system, have recently received an increase in interest in response to a variety of mission needs. Specifically, missions such as the Micro Arcsecond X-Ray Imaging Mission (MAXIM), Terrestrial Pathfinder (TPF), …
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Determining Feasibility of a Propulsionless Microsatellite Formation Flight Mission
<p>Benefits of developing missions with multiple formation flying spacecraft as an alternative to a traditional monolithic vehicle are becoming apparent. In some cases, these missions can lower cost and increase flexibility among other situational advantages. However, there are various limitations …
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Close Formation Flight Missions Using Vision-Based Position Detection System
<p>In this thesis, a formation flight architecture is described along with the implementation and evaluation of a state-of-the-art vision-based algorithm for solving the problem of estimating and tracking a leader vehicle within a close-formation configuration. A vision-based algorithm that uses …
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UAV Formation Flight Utilizing a Low Cost, Open Source Configuration
… faculty and graduate students. An outer-loop formation flight controller based on a virtual waypoint implementation of potential function guidance was developed for use on an embedded microcontroller. A commercially-available autopilot system, designed for fully autonomous waypoint navigation …
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Trust and human performance in automated formation flight station-keeping
… human operators intervention with an autonomous formation flight (AFF) system during monitoring of a station-keeping display. Due to mental and physical workloads, automation technologies have been applied to formation flight for precise station-keeping and resultant fuel reduction, shifting …
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Dynamic and thermal control of an electromagnetic formation flight testbed
Formation flight of multiple spacecraft is an emerging method for completing complex space missions in an efficient manner. A limitation found in maintaining such formations is the need for precise control at all times. Using traditional thruster propulsion systems can be costly and life-limiting …
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A simplified vortex sheet roll-up method for formation flight
… drag and rolling moment experienced by a close formation of two elliptically loaded wings. The roll-up of the leading wake is computed in the Trefftz plane using a linear vorticity panel method. A smoothing parameter as well as a truncation of the vortex sheet in the highly rolled-up areas are …
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The SPHERES Satellite Formation Flight Testbed : design and initial control
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Compound Aircraft Transport: Wingtip-Docked Flight Compared to Formation Flight
Compound Aircraft Transport (CAT) flight involves two or more aircraft using the resources of each other; a symbiotic relationship exists consisting of a host, the mothership aircraft and a parasite, the hitchhiker aircraft. Wingtip-docked flight is just as its name implies; the two aircraft are …
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Autonomous Close Formation Flight of Small UAVs Using Vision-Based Localization
… required localization update rate for various flight patterns and levels of atmospheric turbulence. HIL simulation showed that it should be possible to maintain formation, with a vehicle separation of 50 ± 6 feet and localization estimates updated at 10 Hz, for a range of flight conditions. …
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The effect of wing flexibility on ride comfort in formation flight
… the issue of passenger ride comfort during formation flight. The study focuses on the vibration attenuation that occurs due to the aeroelastic effect, more particularly, on the influences these effects have on the magnitude of the fuselage accelerations. No distinction is made between the …
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Propulsion system characterization for the SPHERES Formation Flight and Docking testbed
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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The effects of atmospheric turbulence on fuel consumption in extended formation flight
Extended formation flight (streamwise separations of between 10 to 40 spans), has been recently proposed as a method for reducing the induced drag of commercial aircraft. However, induced drag savings are not necessarily directly indicative of fuel savings. In a realistic environment, atmospheric …
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The effect of turboprop propulsion on the aerodynamic benefits of formation flight
… propulsion on the aerodynamic benefits of formation flight, a 3D Vortex Filament Method (VFM) programme, which made use of a Burnham-Hallock viscous core model, was formulated and employed to model the progression and interaction of the wing and turboprop trailing wakes. Within this …
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