2026-09-23T07:19:31Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/70623 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Hoffman, Stephen James 2014-12-15T23:55:52Z 2014-12-15T23:55:52Z 10000-01-01 1984 1984 The use of atmospheric drag to circularize spacecraft orbits, a concept referred to as aerobraking, can significantly increase the useful payload mass fraction for various types of missions. A procedure is devised which determines the optimal combination of aerobrake shielding area and initial orbit period to maximize the spacecraft mass in the final orbit. Two computer codes are constructed and the results from each are compared. The first simulation assumes only aerodynamic drag perturbations and uses simplified analytical expressions. The second is a detailed numerical integration including perturbations due to drag, atmospheric rotation, planet oblateness, third-body effects, and solar radiation pressure. Hypersonic aerodynamic heating rate equations for two different shield configurations are discussed and their performances are compared. Illustrative numerical examples for a Venus and a Mars mission are included. Made available in DSpace on 2014-12-15T23:55:52Z (GMT). No. of bitstreams: 1 8422080.pdf: 4954970 bytes, checksum: 442bcc180dd7a1809127cc8815e156de (MD5) Previous issue date: 1984 Embargo set by: Seth Robbins for item 70789 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 161 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984. http://hdl.handle.net/2142/70623 (UMI)AAI8422080 Engineering, Aerospace An Optimization Method for the Preliminary Design of Interplanetary Aerobraking Missions (Spacecraft, Orbit Mechanics) text Aeronautical and Astronautical Engineering Aeronautical and Astronautical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.