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oai:www.ideals.illinois.edu:2142/22283 2023-07-10 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Conway, Bruce A. Mirfakhraie, Koorosh 2011-05-07T13:34:56Z 2011-05-07T13:34:56Z 10000-01-01 1991 A method has been developed for determining optimal, i.e. minimum fuel, trajectories for the fixed-time cooperative rendezvous of two spacecraft. The method assumes that the vehicles perform a minimum of three impulsive maneuvers with each vehicle being active, that is, making at least one maneuver. The cost of a reference rendezvous solution is improved by an optimizer which uses an analytical gradient developed using primer vector theory and a new solution for the optimal terminal (rendezvous) maneuver. Results are presented for a large number of cases in which the allotted time for rendezvous and other problem parameters including initial relative position, engine efficiencies, initial masses, and fuel mass fractions of the two vehicles are varied. Further improvement in cost may be realized when an additional, i.e. mid-course, impulse is allowed as part of one of the vehicles' trajectory. The criteria for addition of a mid-course impulse to a neighboring solution trajectory has been developed. The cooperative rendezvous proves advantageous particularly in missions with relatively short durations and when fuel constraints are present. Made available in DSpace on 2011-05-07T13:34:56Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9124462.pdf: 3277382 bytes, checksum: 81bb887087e9d639285fe1956ab9828f (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:34Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:26:27-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9124462 (UMI)AAI9124462 http://hdl.handle.net/2142/22283 eng Copyright 1991 Mirfakhraie, Koorosh Engineering, Aerospace Optimal cooperative time-fixed impulsive rendezvous text Aerospace Engineering Aerospace Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.