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dc.contributor.authorBitzer, Matthew Scotten_US
dc.date.accessioned2014-03-14T20:36:49Z
dc.date.available2014-03-14T20:36:49Z
dc.date.issued2009-04-30en_US
dc.identifier.otheretd-05142009-153456en_US
dc.identifier.urihttp://hdl.handle.net/10919/32766
dc.description.abstractWe present optimal solutions for a point-mass electrodynamic tether (EDT) performing phasing and orbit-raising maneuvers. An EDT is a conductive tether on the order of 20 km in length and uses a Lorentz force to provide propellantless thrust. We develop the optimal equations of motion using Pontryagin's Minimum Principle. We find numerical solutions using a global, stochastic optimization method called Adaptive Simulated Annealing. The method uses Markov chains and the system's cost function to narrow down the search space. Newton's Method brings the error in the residual to below a specific tolerance. We compare the EDT solutions to similar constant-thrust solutions and investigate the patterns in the solution space. The EDT phasing maneuver has invariance properties similar to constant-thrust phasing maneuvers. Analyzing the solution space reveals that the EDT is faster at performing phasing maneuvers but slower at performing orbit-raising maneuvers than constant-thrust spacecraft. Also several bifurcation lines occur in the solution spaces for all maneuvers studied.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartMattBitzerThesisFinal.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectOptimal Controlen_US
dc.subjectElectrodynamic Tethersen_US
dc.subjectOrbit Transfersen_US
dc.titleOptimal Electrodynamic Tether Phasing and Orbit-Raising Maneuversen_US
dc.typeThesisen_US
dc.contributor.departmentAerospace and Ocean Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineAerospace and Ocean Engineeringen_US
dc.contributor.committeechairHall, Christopher D.en_US
dc.contributor.committeememberCliff, Eugene M.en_US
dc.contributor.committeememberWoolsey, Craig A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05142009-153456/en_US
dc.date.sdate2009-05-14en_US
dc.date.rdate2009-06-17
dc.date.adate2009-06-17en_US


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