2026-09-21T00:44:15Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/115817 2023-07-11 col_2142_5131 col_2142_16340 com_2142_5130 com_2142_16339 com_2142_8903

Putnam, Zachary R 2022-05 application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-14 without embargo terms The student, Daniel Engel, accepted the attached license on 2022-04-19 at 13:26. The student, Daniel Engel, submitted this Thesis for approval on 2022-04-19 at 14:29. This Thesis was approved for publication on 2022-04-26 at 11:42. DSpace SAF Submission Ingestion Package generated from Vireo submission #17807 on 2022-11-14 at 17:33:56 Performance assessment of Mars entry systems with flap-based trajectory control Engel, Daniel Louis 2022-04-26 DFC Entry Planetary entry Entry descent and landing EDL Hypersonic Hypersonic flaps Flaps Flap-steering Entry vehicle control surfaces Bank-angle steering Direct force control Aerodynamic control authority Range capability Response time Aerodynamic trim Flight mechanics Guidance navigation and control GNC Previous Mars entry, descent, and landing systems have utilized bank-angle steering during the hypersonic phase of entry to control range. An alternate solution for hypersonic steering is a set of independently-articulated aerodynamic flaps. Deflecting these flaps results in trim at non-zero angles of attack and sideslip angles, enabling the vehicle to generate lift in arbitrary directions. This study compares current state-of-the-art bank-angle steering to flap-based steering across several theoretical performance metrics, including aerodynamic control authority, range capability, and response time. The concepts of effective bank angle and effective lift-to-drag ratio are developed to compare the control authority between flap configurations and to bank-angle steering systems. The shape of the non-axisymmetric control authority depends on the flap placement, area, and number of flaps, however flap-based steering systems likely require a mechanism for roll or bank in order to have a uniform control authority. Aerodynamic control authority is also mapped to a range capability. Flap-steering vehicles exhibit range capabilities with markedly different shapes relative to bank-angle steering vehicles with equivalent maximum hypersonic lift-to-drag ratios. For near-equivalent attitude maneuvers, flap steering vehicles are found to be able to rotate directly between angular positions and have both a more uniform and faster response time relative to bank-angle steering vehicles. Thesis eng https://hdl.handle.net/2142/115817 Copyright 2022 by Daniel L. Engel M.S. Thesis Aerospace Engineering University of Illinois at Urbana-Champaign Aerospace Engineering