Re-Entry Vehicle Control System Design and Mechanization

Item

Title
Re-Entry Vehicle Control System Design and Mechanization
Date
1966
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
AFFDL TR 66-3
Creator
Scharmack, D. K.
Ward, M. D.
Corporate Author
Honeywell, Inc.
Laboratory
Air Force Flight Dynamics Laboratory
Extent
210
NTRL Accession Number
AD485616
Identifier
AD0485616
Access Rights
Export Control
Distribution Classification
1
Contract
AF 33(615)-1858
DoD Project
8225
DoD Task
822501
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
AFFDL LTR
Abstract
A nonlinear optimal feedback control scheme for controlling a vehicle re-entering the earth's atmosphere from lunar return initial conditions is reported. The optimal feedback control law used in the scheme is obtained from a multi-dimensional surface fit of the control function for several optimal trajectories. Partials of the control with respect to the state vector are included in the fitting procedure. The functional minimized by the trajectories is the total (convective plus radiative) stagnation point heat. The feedback control scheme is developed, and several re-entry trajectories are simulated. Modest increasing total heat from optimal values are observed, and large (although tolerable) terminal point errors occur. It is believed that the terminal errors can be greatly reduced, if necessary. A powerful predictor scheme is developed which allows optimal a function of a parameter. This is used to extend the range of an optimal trajectory, to perform an absolute minimum test, and to map the optimal re-entry corridor. Sufficiency tests for a relative minimum are mechanized, and it is shown that the trajectories considered are minimizing paths.
Report Availability
Full text available
Date Issued
1966-04
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
AFFDLTR66-003.pdf

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