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Energy management of three-dimensional minimum-time interceptA real-time computer algorithm to control and optimize aircraft flight profiles is described and applied to a three-dimensional minimum-time intercept mission. The proposed scheme has roots in two well known techniques: singular perturbations and neighboring-optimal guidance. Use of singular-perturbation ideas is made in terms of the assumed trajectory-family structure. A heading/energy family of prestored point-mass-model state-Euler solutions is used as the baseline in this scheme. The next step is to generate a near-optimal guidance law that will transfer the aircraft to the vicinity of this reference family. The control commands fed to the autopilot (bank angle and load factor) consist of the reference controls plus correction terms which are linear combinations of the altitude and path-angle deviations from reference values, weighted by a set of precalculated gains. In this respect the proposed scheme resembles neighboring-optimal guidance. However, in contrast to the neighboring-optimal guidance scheme, the reference control and state variables as well as the feedback gains are stored as functions of energy and heading in the present approach. Some numerical results comparing open-loop optimal and approximate feedback solutions are presented.
Document ID
19850061690
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kelley, H. J.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Cliff, E. M.
(Virginia Polytechnic Institute and State University Blacksburg, United States)
Visser, H. G.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Aircraft Stability And Control
Report/Patent Number
AIAA PAPER 85-1781
Meeting Information
Meeting: Atmospheric Flight Mechanics Conference
Location: Snowmass, CO
Start Date: August 19, 1985
End Date: August 21, 1985
Accession Number
85A43841
Distribution Limits
Public
Copyright
Other

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