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Record Details

Record 59 of 6293
Optimal guidance and propulsion control for transatmospheric vehicles
Author and Affiliation:
Corban, J. E.(Georgia Inst. of Tech., Atlanta, GA, United States)
Calise, A. J.(Georgia Inst. of Tech., Atlanta, GA, United States)
Flandro, G. A.(Georgia Institute of Technology, Atlanta, United States)
Abstract: Problems associated with on-board trajectory optimization and with the synthesis of guidance laws are addressed for ascent to LEO of an air-breathing, single-stage-to-orbit vehicle. A multimode propulsion system is assumed which incorporates turbojet, ramjet, scramjet, and rocket engines. An energy-state approximation is applied to a four-state dynamic model for flight of a point mass over a spherical nonrotating earth. An algorithm for generating fuel-optimal climb profiles is derived via singular perturbation theory. This algorithm results from application of the minimum principle to a low-order dynamic model that includes general functional dependence on angle of attack and a normal component of thrust. Switching conditions are derived which, under appropriate assumptions, govern optimal transition from one propulsion mode to another. The use of bank angle to modulate the magnitude of the vertical component of lift is shown to improve the index performance. Numerical results illustrate the nature of the resulting fuel-optimal climb paths.
Publication Date: Aug 01, 1989
Document ID:
19890065348
(Acquired Nov 28, 1995)
Accession Number: 89A52719
Subject Category: LAUNCH VEHICLES AND SPACE VEHICLES
Report/Patent Number: AIAA PAPER 89-3617
Document Type: Preprint
Publisher Information: United States
Contract/Grant/Task Num: NAG1-922
Financial Sponsor: NASA; United States
Organization Source: Georgia Inst. of Tech.; Atlanta, GA, United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CONTROL SYSTEMS DESIGN; ENGINE CONTROL; SPACECRAFT GUIDANCE; TRANSATMOSPHERIC VEHICLES; ANGLE OF ATTACK; BOUNDARY LAYER FLOW; LIFT; PERTURBATION THEORY
Imprint And Other Notes: AIAA, Guidance, Navigation and Control Conference, Boston, MA, Aug. 14-16, 1989. 12 p. Research supported by General Dynamics Corp.
Availability Source: Other Sources
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