Efficient Low-Speed Flight in a Wind Field

dc.contributor.authorFeldman, Michael A.en
dc.contributor.committeechairCliff, Eugene M.en
dc.contributor.committeememberLutze, Frederick H. Jr.en
dc.contributor.committeememberDurham, Wayne C.en
dc.contributor.departmentAerospace and Ocean Engineeringen
dc.date.accessioned2014-03-14T20:51:00Zen
dc.date.adate1996-07-24en
dc.date.available2014-03-14T20:51:00Zen
dc.date.issued1996-07-24en
dc.date.rdate1996-07-24en
dc.date.sdate1998-07-13en
dc.description.abstractA new software tool was needed for flight planning of a high altitude, low speed unmanned aerial vehicle which would be flying in winds close to the actual airspeed of the vehicle. An energy modeled NLP formulation was used to obtain results for a variety of missions and wind profiles. The energy constraint derived included terms due to the wind field and the performance index was a weighted combination of the amount of fuel used and the final time. With no emphasis on time and with no winds the vehicle was found to fly at maximum lift to drag velocity, V<sub>md</sub>. When flying in tail winds the velocity was less than V<sub>md</sub>, while flying in head winds the velocity was higher than Vmd. A family of solutions was found with varying times of flight and varying fuel amounts consumed which will aid the operator in choosing a flight plan depending on a desired landing time. At certain parts of the flight, the turning terms in the energy constraint equation were found to be significant. An analysis of a simpler vertical plane cruise optimal control problem was used to explain some of the characteristics of the vertical plane NLP results.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-17616979652211en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-17616979652211/en
dc.identifier.urihttp://hdl.handle.net/10919/36527en
dc.publisherVirginia Techen
dc.relation.haspartetd.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectoptimizationen
dc.subjectoptimal controlen
dc.subjectaircraft performanceen
dc.titleEfficient Low-Speed Flight in a Wind Fielden
dc.typeThesisen
thesis.degree.disciplineAerospace and Ocean Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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