Optimal low-thrust, Earth-Moon trajectories

dc.contributor.advisor Bion L. Pierson
dc.contributor.author Kluever, Craig
dc.contributor.department Aerospace Engineering
dc.date 2018-08-23T02:31:43.000
dc.date.accessioned 2020-06-30T07:05:03Z
dc.date.available 2020-06-30T07:05:03Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1993
dc.date.issued 1993
dc.description.abstract <p>A variety of optimal trajectories from a circular low-Earth parking orbit to a circular low-lunar parking orbit are computed for a range of low-thrust spacecraft. The problem is studied in the context of the classical restricted three-body problem. Minimum-fuel, planar trajectories with a fixed thrust-coast-thrust engine sequence are computed for both a "high-end" low-thrust spacecraft and "moderate" low-thrust nuclear electric propulsion (NEP) spacecraft. Since a low-thrust trajectory is a long duration transfer with slowly developing spirals about the Earth and Moon, the minimum-fuel Earth-Moon trajectory is obtained by formulating and successively solving a hierarchy of sub-problems. The subproblems include optimal Earth-escape and Moon-capture trajectories and sub-optimal translunar trajectories. The complete minimum-fuel trajectory problem is eventually solved using a "hybrid" direct/indirect method which utilizes the benefits of a direct optimization method and an indirect method from optimal control theory. Minimum-fuel transfers are also computed using a switching function structure which results in multiple thrust and coast arcs. In addition, a new combined vehicle and trajectory optimization problem of maximum payload fraction is formulated and solved. Finally, three-dimensional minimum-fuel trajectories are obtained for both the "high-end" and "moderate" low-thrust spacecraft. Numerical results are presented for various optimal Earth-Moon trajectories.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10466/
dc.identifier.articleid 11465
dc.identifier.contextkey 6404713
dc.identifier.doi https://doi.org/10.31274/rtd-180813-9731
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10466
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63615
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10466/r_9321183.pdf|||Fri Jan 14 18:21:25 UTC 2022
dc.subject.disciplines Aerospace Engineering
dc.subject.keywords Aerospace engineering and engineering mechanics
dc.subject.keywords Aerospace engineering
dc.title Optimal low-thrust, Earth-Moon trajectories
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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