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Dissertations / Theses on the topic 'Formation flights'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Yin, Feijia, Volker Grewe, Christine Frömming, and Hiroshi Yamashita. "Impact on flight trajectory characteristics when avoiding the formation of persistent contrails for transatlantic flights." Elsevier, 2018. https://publish.fid-move.qucosa.de/id/qucosa%3A72194.

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This paper studies the impacts on flight trajectories, such as lateral and vertical changes, when avoiding the formation of persistent contrails for transatlantic flights. A sophisticated Earth-System Model (EMAC) coupled with a flight routing submodel (AirTraf) and a contrail submodel (CONTRAIL) is used to optimize flight trajectories concerning the flight time and the flight distance through contrail forming regions (contrail distance). All the trajectories are calculated taking into account the effects of the actual and local meteorological parameters, e.g., wind, temperature, relative humi

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Buchner, Denzil. "Automatic control of commercial airliners in formation flight." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96963.

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Thesis (MEng)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: This thesis presents research contributing towards the automatic control of formation flight for commercial airliners. The motivation behind this research is to ultimately reduce fuel consumption of the trailing airliner through the utilisation of the aerodynamic coupling interactions between the trailing airliner and the wake vortices of the leading airliner. A traditional model for an airliner in isolated flight is developed and expanded to include formation flight interactions as functions of the vertical and late

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Elsaka, Basem [Verfasser]. "Simulated satellite formation flights for detecting the temporal variations of the Earth's gravity field / Basem Elsaka." Bonn : Universitäts- und Landesbibliothek Bonn, 2019. http://d-nb.info/1199005320/34.

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4

Shankar, Kumar Priya Balaji. "Dynamics of spacecraft formation flight." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417979.

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5

Magill, Samantha Anne. "Compound Aircraft Transport: Wingtip-Docked Flight Compared to Formation Flight." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/11122.

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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 connected wingtip-to-wingtip. Formation flight describes multiple aircraft or flying objects that maintain a pattern or shape in the air. There are large aerodynamic advantages in CAT flight. The aforementioned wingtip-docked flight increases total span of the aircraft system, and formation flight util

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Schweighart, Samuel A. (Samuel Adam) 1977. "Electromagnetic formation flight dipole solution planning." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32464.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.<br>Includes bibliographical references (p. 325-327).<br>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 controlled without the use of traditional thrusters. This thesis demonstrates the feasibility of the EMFF system. First three different models for t

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Kwon, Daniel W. 1980. "Electromagnetic formation flight of satellite arrays." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30150.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.<br>Includes bibliographical references (p. 167-169).<br>Proposed methods of actuating spacecraft in sparse aperture 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 to increase exponentially. Additional problems posed by propellant include optical contam

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8

Kong, Edmund Mun Choong 1973. "Spacecraft formation flight exploiting potential fields." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16835.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.<br>Includes bibliographical references (p. 161-164).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>The potential benefits that can be reaped from a distributed satellite system have led to the proposal of several multi-spacecraft missions by both NASA and DoD. One such benefit is the reconfigurability of these multi-spacecraft systems. This ultimately led to additional requirements being l

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9

Kshatriya, Mrigesh. "Optimum bird flock size in formation flight." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30004.

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A theoretical model of flock size in migrating birds is developed. Although previous models of formation flight in birds show improved flight performance, they do not explain flock size variation across bird species or at different times of the year for a given bird species. This model captures some of the diversity in flock size observed in nature by incorporating energetic costs of flight and energy income from foraging. It turns out that within a myriad of possible flock sizes there - is one that is optimal for maximizing energetic efficiency (net energetic gain/energy expenditure) for a gi

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10

Kabaliuk, Natalia. "Dynamics of Blood Drop Formation and Flight." Thesis, University of Canterbury. Mechanical Engineering, 2014. http://hdl.handle.net/10092/8979.

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Violent crimes involving bloodshed may result in the formation of a number of blood drops that move through air and impact onto a surface producing a bloodstain pattern. Bloodstain Pattern Analysis (BPA), the analysis of the position, distribution, size and morphology of the stains within the pattern present at a crime scene, may provide information about the events that gave rise to the bloodshed. The location of blood origin, i.e. victim’s position at the moment of wounding and (or) wound location, determination is of major interest to BPA. This study investigated the dynamics of formation a

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Sakaguchi, Aya S. M. Massachusetts Institute of Technology. "Micro-electromagnetic formation flight of satellite systems." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/39708.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, June 2007.<br>Includes bibliographical references (p. 93-94).<br>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 for aggressive maneuvering over large distances with concepts such as terrestrial planet finder in mind. A nominal mode of operation, of simpl

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12

Tipping-Woods, William P. "Wing trailing vortex paths in formation flight." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13228.

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Includes bibliographical references.<br>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 models downstream of the second aircraft in the formation. To tackle this problem, a combined vortex lattice and vortex filament numerical model was developed. For each simulation the vortex lattice model determined the lift distribution which was applied to th

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Paita, Fabrizio. "Novel consensus strategies applied to spacecraft formation flight." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/460897.

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In this thesis we consider the problem of developing distributed control strategies for spacecraft formation flying. In light of possible interferometric applications, the study is conducted in two different contexts: formation acquisition and keeping, and attitude synchronization. Among others, elements of Graph and Lyapunov stability theory are employed to modellize the formation dynamics and to establish analytically basic convergence properties for the proposed control laws. In the case of formation acquisition and keeping, the related strategy is designed to asymptotically cancel the s

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14

Bizinos, Nicholas. "Passenger comfort during formation flight within atmospheric turbulence." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/12050.

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Includes abstract.<br>Includes bibliographical references.<br>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 approximately ascertain the increase in discomfort, a simple formation flight aerodynamic model for two aircraft in formation was developed. The wing trailing vortices were assumed to shift in an ideal fashion within atmospheric turbulence resulting i

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Kent, Thomas Eliot. "Optimal routing and assignment for commercial formation flight." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.689690.

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This thesis investigates the notion of fuel-reduction through formation flight for commercial aircraft, addressing the problems of global routing and assignment. A two stage centralised approach is presented, firstly, assuming a reduction in observed cost by flying in formation the routes, including rendezvous and break points, are calculated to minimise a total cost. The interconnected assignment problem then takes a set of flights, their possible formations and corresponding costs and optimally allocates them into a cost-minimising formation fleet. An analytic geometric approach is used to d

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Flight, Jennifer Noel. "Sequence stratigraphic analysis of the Fox Hills and Hell Creek Formations (Maastrichtian), Eastern Montana and its relationship to dinosaur paleontology." Thesis, Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/flight/FlightJ04.pdf.

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The Upper Cretaceous Hell Creek Formation near the Fort Peck Reservoir, eastern Montana, has received significant investigation due to the large variety and exceptional preservation of included fossil material. Workers have focused mainly on taphonomic and paleontologic issues, but lack of a stratigraphic framework within which to place fossil finds in order to address questions of evolution, population diversity, and paleoecology. This study uses sequence stratigraphy to correlate within the Fox Hills and Hell Creek Formations such that paleontologic data can be interpreted in relation to a s

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17

Tolbert, Douglas Robert. "Spacecraft formation flight at sun-earth/moon libration points." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Tolbert_09007dcc8069e8b8.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed August 14, 2009) Includes bibliographical references (p. 68-71).

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Levis, Aaron. "Determining Feasibility of a Propulsionless Microsatellite Formation Flight Mission." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1882.

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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 that are imposed by these missions that are centered on the concept of maintaining the necessary formation. One such limitation is that of the propulsion system required for each spacecraft. To mitigate the complexity and mass of the onboard propulsion, the pairing of electromagnetic actuators and diffe

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Saenz, Otero Alvar 1975. "The SPHERES Satellite Formation Flight Testbed : design and initial control." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86830.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (p. 275-278).<br>by Alvar Saenz Otero.<br>M.Eng.

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Neave, Matthew D. (Matthew David). "Dynamic and thermal control of an electromagnetic formation flight testbed." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32436.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.<br>Includes bibliographical references (p. 141).<br>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 since the propellant is consumed during the mission. An alternative method for providing this relative position control is to use electromagnetic inter

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Denis, Amandine 1981. "A simplified vortex sheet roll-up method for formation flight." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28898.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2004.<br>Includes bibliographical references (p. 105-108).<br>This thesis studies the influence of the roll-up of a wake on the benefits in induced 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 introduced in order to stabilize the computations. The trailing

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Jang, Jinho S. M. Massachusetts Institute of Technology. "Trust and human performance in automated formation flight station-keeping." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/34139.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2005.<br>Includes bibliographical references (p. 81-84).<br>This thesis primarily describes performance and decision heuristics of 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 control authority from humans to machines. Accordingly, the human is not directly i

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Lopez, Christian W. "UAV Formation Flight Utilizing a Low Cost, Open Source Configuration." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1089.

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The control of multiple unmanned aerial vehicles (UAVs) in a swarm or cooperative team scenario has been a topic of great interest for well over a decade, growing steadily with the advancements in UAV technologies. In the academic community, a majority of the studies conducted rely on simulation to test developed control strategies, with only a few institutions known to have nurtured the infrastructure required to propel multiple UAV control studies beyond simulation and into experimental testing. With the Cal Poly UAV FLOC Project, such an infrastructure was created, paving the way for future

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WANG, ZHONG-SHENG. "DYNAMICS ANALYSIS OF SATELLITE FORMATION FLIGHT USING SOLAR RADIATION PRESSURE." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1005854591.

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Nilsuwan, Sma. "Uninhabited aircraft design optimised for close formation air-refuelling flight." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5545.

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Uninhabited combat aerial vehicles (UCAVs) are intended for carrying out high-risk combat missions with a high degree of precision, effectiveness and efficiency and without endangering pilots’ lives. An air refuelling system for UCAVs could bring out their full potential in wartime action, by extending their range capability and increasing their airborne time. Hence, the main aim of this PhD research programme was to develop a design and optimisation methodology for an innovative concept consisting of a large uninhabited tanker and a number of UCAVs flying in a close formation, with an optimis

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Iglesias, Sergio. "Optimum Spanloads Incorporating Wing Structural Considerations And Formation Flying." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35718.

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The classic minimum induced drag spanload is not necessarily the best choice for an aircraft. For a single aircraft configuration, variations from the elliptic, minimum drag optimum load distribution can produce wing weight savings that result in airplane performance benefits. For a group of aircraft flying in formation, non-elliptic lift distributions can give high induced drag reductions both for the formation and for each airplane. <p> For single aircraft, a discrete vortex method which performs the calculations in the Trefftz plane has been used to calculate optimum spanloads for non-copl

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Sengupta, Prasenjit. "Dynamics and control of satellite relative motion in a central gravitational field." Texas A&M University, 2006. http://hdl.handle.net/1969.1/4724.

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The study of satellite relative motion has been of great historic interest, primarily due to its application to rendezvous, intercept, and docking maneuvers, between spacecraft in orbit about gravitational bodies, such as the Earth. Recent interest in the problem of satellite formation flight has also led to renewed effort in understanding the dynamics of relative motion. Satellite formations have been proposed for various tasks, such as deep-space interferometry, and terrestrial observation, among others. Oftentimes, the rich natural dynamics of the relative motion problem near a gravitationa

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Chen, Allen 1979. "Propulsion system characterization for the SPHERES Formation Flight and Docking testbed." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82246.

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Darling, Michael B. "Autonomous Close Formation Flight of Small UAVs Using Vision-Based Localization." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1185.

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As Unmanned Aerial Vehicles (UAVs) are integrated into the national airspace to comply with the 2012 Federal Aviation Administration Reauthorization Act, new civilian uses for robotic aircraft will come about in addition to the more obvious military applications. One particular area of interest for UAV development is the autonomous cooperative control of multiple UAVs. In this thesis, a decentralized leader-follower control strategy is designed, implemented, and tested from the follower’s perspective using vision-based localization. The tasks of localization and control were carried out with s

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Biden, Kirsty Joy. "The effect of wing flexibility on ride comfort in formation flight." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24318.

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The paper addresses 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 fuselage and passenger accelerations in the present work. The objective of the present study was to develop a representative aircraft model incorporating an aerodynamic model, based on the classical Vortex Lattice Method (VLM) and structural and inertial models defined by stiffness and mas

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Gibbs, Jason. "Experimental Determination of Lift and Lift Distributions for Wings In Formation Flight." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31301.

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Experimental methods for the investigation of trailing vortex strengths, total lift, and lift distributions for three-dimensional wings in close proximity flight were developed. With these experiments we model compound aircraft flight either docked tip-to-tip, or flying in formation. There is a distinct lack of experimental formation flight data using three-dimensional wing models for tests. The absence of fixed walls on either end of the wing permits the development of the asymmetric shedding of vortices, and the determination of the asymmetric circulation distribution induced by the proxi

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Di, Long. "Cognitive Formation Flight in Multi-Unmanned Aerial Vehicle-Based Personal Remote Sensing Systems." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/985.

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This work introduces a design and implementation of using multiple unmanned aerial vehicles (UAVs) to achieve cooperative formation flight based on the personal remote sensing platforms developed by the author and the colleagues in the Center for Self-Organizing and Intelligent Systems (CSOIS). The main research objective is to simulate the multiple UAV system, design a multi-agent controller to achieve simulated formation flight with formation reconfiguration and real-time controller tuning functions, implement the control system on actual UAV platforms and demonstrate the control strategy an

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Sattigeri, Ramachandra Jayant. "Adaptive Estimation and Control with Application to Vision-based Autonomous Formation Flight." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16272.

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The role of vision as an additional sensing mechanism has received a lot of attention in recent years in the context of autonomous flight applications. Modern Unmanned Aerial Vehicles (UAVs) are equipped with vision sensors because of their light-weight, low-cost characteristics and also their ability to provide a rich variety of information of the environment in which the UAVs are navigating in. The problem of vision based autonomous flight is very difficult and challenging since it requires bringing together concepts from image processing and computer vision, target tracking and state estima

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Saban, Deborah. "Wake Vortex Modelling and Simulation for Air Vehicles in Close Formation Flight." Thesis, Cranfield University, 2010. http://hdl.handle.net/1826/4414.

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The aim of this research is to develop realistic models of aerodynamic cross-coupling e ects that can be incorporated in real-time or near real-time simulations of Unmanned Aerial Vehicles (UAVs) in close formation flight. These would permit the assessment of the risks and issues associated with wake vortex evolution and encounter and the analysis of their consequences on the design of automatic control systems and the development of safe and reliable operating procedures. A number of wake vortex modelling techniques that can be used in formation flight simulations are reviewed. A novel Wake V

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McKenzie, Cameron Cedric. "The effect of turboprop propulsion on the aerodynamic benefits of formation flight." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/25417.

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In order to determine the effect of turboprop 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 programme, an initial prescribed wake for the turboprop engines was discretised by shed helicoidal vortex filaments generated by the use of an amalgamation of the propeller theory of Goldstein and Theodorsen. The downwash velocity field of a B747 during cruise, obtained

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Sanders, Drewan S. "The effects of atmospheric turbulence on fuel consumption in extended formation flight." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9147.

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Includes bibliographical references.<br>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 turbulence will continuously perturb the formation’s aircraft and their wakes. As a result, each aircraft in the formation will experience fluctuations in aerodynamic loads. For an aircraft to maintain accurately its position within a formation, it must continua

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LI, HONGMING. "APPLICATION OF SOLAR RADIATION PRESSURE TO FORMATION CONTROL NEAR LIBRATION POINTS." University of Cincinnati / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1205166301.

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Wong, Oliver D. "Formation and evolution of tip vortices of an isolated rotor in forward flight." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/12377.

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Berkovitz, Dustin S. (Dustin Scott). "System characterization and online mass property identification of the SPHERES formation flight testbed." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43083.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.<br>Includes bibliographical references (p. 89-91).<br>The National Aeronautics and Space Administration (NASA) and other entities in the aerospace industry have recently been considering distributed architectures for many space applications, such as space-based interferometry. Whether the craft in such a system are structurally connected or flown in tight formation, distribution allows for higher redundancy in case of failures as well as reducing the minimum payload footprint for launch. Designed

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Lukacovic, Kyle S. "A Parametric Study of Formation Flight of a Wing Based on Prandtl's Bell-Shaped Lift Distribution." DigitalCommons@CalPoly, 2020. https://digitalcommons.calpoly.edu/theses/2130.

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The bell-shaped lift distribution (BSLD) wing design methodology advanced by Ludwig Prandtl in 1932 was proposed as providing the minimum induced drag. This study used this method as the basis to analyze its characteristics in two wing formation flight. Of specific interest are the potential efficiency savings and the optimal positioning for formation flight. Additional comparison is made between BSLD wings and bird flight in formation. This study utilized Computational Flow Dynamics (CFD) simulations on a geometric modeling of a BSLD wing, the Prandtl-D glider. The results were validated by m

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McMullen, Eric L., and Brian Shane Grass. "EFFECTS OF UAV SUPERVISORY CONTROL ON F-18 FORMATION FLIGHT PERFORMANCE IN A SIMULATOR ENVIRONMENT." Monterey, California. Naval Postgraduate School, 2013. http://hdl.handle.net/10945/32870.

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Continual advances in technology, along with increased cockpit workload particularly the shift from two-seat to single-seat fighters to save money and reduce risk to lifepush the limits of human mental capacity. Additionally, there is interest within the military aviation community to integrate Unmanned Aerial Vehicle (UAV) control into the cockpit in order to expand force projection capability. This study compared the effects on formation flight performance of two different secondary tasks, specifically a traditional secondary task such as target prosecution with an electro-optical Forward Lo

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Chung, Soon-Jo 1976. "Nonlinear control and synchronization of multiple Lagrangian systems with application to tethered formation flight spacecraft." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40304.

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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 217-228).<br>This dissertation focuses on the synchronization of multiple dynamical systems using contraction theory, with applications to cooperative control of multi-agent systems and synchronization of interconnected dynamics such as tethered formation flight. Inspired by stable combinations of biologi

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Kwon, Daniel W. 1980. "Cryogenic heat pipe for cooling high temperature superconductors with application to Electromagnetic Formation Flight Satellites." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/62966.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 195-200).<br>An emerging method of propellant-less formation flight propulsion is the use of electromagnets coupled with reaction wheels. This technique is called Electromagnetic Formation Flight (EMFF). In order to create a large magnetic field necessary for actuating formation flying spacecraft, EMFF uses high temperature superconducting (HTS) wire since it is able to carry a large current at low power. To ach

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Tian, Ming, and 田鸣. "Catalytic methane dehydroaromatization and polycyclic aromatic hydrocarbons formation on grain surface reaction studies using time of flight mass spectrometry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/196032.

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This thesis reports studies of methane dehydro-aromatization (MDA) over Zn-based/HZSM-5 catalysts and the catalytic conversion of acetylene gas (C2H2) on grain surface reactions using time-of-flight mass spectrometry (TOF-MS). Both catalytic reactions generate polycyclic aromatic hydrocarbons (PAHs) as their final products. For the MDA reaction, the performance of Zn-based/HZSM-5 catalysts prepared by wet impregnation method was investigated under the conditions of atmospheric pressure and supersonic jet expansion (SJE). The experimental results revealed that, under the SJE condition, the Zn/H

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Liu, Yaolong [Verfasser]. "Investigation on the Benefit and Feasibility of Applying Formation Flight to Civil Transport Aircraft / Yaolong Liu." Aachen : Shaker, 2016. http://d-nb.info/111825774X/34.

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Alvisio, Bruno. "Development and validation of an Electromagnetic Formation Flight simulation as a platform for control algorithm design." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97362.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 113-115).<br>Electromagnetic Formation Flight (EMFF) consists of using electromagnetic forces to position or orient satellites in a relative target location or attitude and achieve a certain target formation on orbit. This thesis introduces the fundamental equations of EMFF and the design of the Resonant Inductive Near-Field Generation System (RINGS). RINGS is a testbed composed of two vehicles that are use

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Lee, Sang-il S. M. Massachusetts Institute of Technology. "Design and implementation of the state estimator for trajectory following of an electromagnetic formation flight testbed." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44934.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 65-67).<br>Formation fight of multiple satellites is an attractive concept for achieving complicated space missions that are di±cult or impossible with a single monolithic satellite. Since traditional thrusters require propellant consumption for maintaining the formation of multiple satellites, one concern

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Cao, Wenjin. "SPECTROSCOPY AND FORMATION OF LANTHANUM-HYDROCARBON COMPLEXES." UKnowledge, 2018. https://uknowledge.uky.edu/chemistry_etds/106.

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Lanthanum-mediated bond activation reactions of small hydrocarbon molecules, including alkenes, alkynes, and alkadienes, were carried out in a laser vaporization metal cluster beam source. Time-of-flight mass spectrometry and mass-analyzed threshold ionization (MATI) spectroscopy, in combination with quantum chemical and multi-dimensional Franck-Condon factor calculations, were utilized to identify the reaction products and investigate their geometries, electronic structures, and formation mechanisms. La-hydrocarbon association was only observed in the reaction of La with isoprene. C-H bond ac

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Langley, Kenneth Roy. "Investigations of Partially Immersed Spinning Spheres in a Liquid Bath and Butterfly Flight." BYU ScholarsArchive, 2013. https://scholarsarchive.byu.edu/etd/3948.

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This thesis examines two important problems in fluid dynamics: that of a partially immersed sphere spinning in a bath of liquid and the measurement of flow velocities around a free flying butterfly. Although the actual problems are quite different, each problem incorporates many of the same principles and techniques. When a hard-boiled egg spins through a pool of milk on the kitchen counter, the milk rises up the sides of the egg and droplets are ejected. This phenomenon occurs when any partially submerged object whose radius increases upward from the fluid surface (e.g., spheres, inverted con

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Bolting, Jan. "Contributions au vol en formation serrée de petits drones." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0013.

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Les mini-drones à propulsion électrique sont susceptibles d’avoir une endurance inférieure à celle de drones plus grands.L’exploitation des interactions aérodynamiques, inspirée par les oiseaux migratoires, ainsi que le ravitaillement en vol , sont des approches prometteuses pour améliorer l’endurance des mini-drones. La commande par modes glissants d’ordre supérieur en temps continu (CTHOSM) a été considérée comme un candidat prometteur à ce problème ouvert difficile et a été appliquée avec succès à des modèles cinématiques simples. Dans nos travaux, nous étudions les implications de la prése

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