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Algorithm for fixed-range optimal trajectoriesAn algorithm for synthesizing optimal aircraft trajectories for specified range was developed and implemented in a computer program written in FORTRAN IV. The algorithm, its computer implementation, and a set of example optimum trajectories for the Boeing 727-100 aircraft are described. The algorithm optimizes trajectories with respect to a cost function that is the weighted sum of fuel cost and time cost. The optimum trajectory consists at most of a three segments: climb, cruise, and descent. The climb and descent profiles are generated by integrating a simplified set of kinematic and dynamic equations wherein the total energy of the aircraft is the independent or time like variable. At each energy level the optimum airspeeds and thrust settings are obtained as the values that minimize the variational Hamiltonian. Although the emphasis is on an off-line, open-loop computation, eventually the most important application will be in an on-board flight management system.
Document ID
19800019828
Document Type
Technical Publication (TP)
Authors
Lee, H. Q. (NASA Ames Research Center Moffett Field, CA, United States)
Erzberger, H. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
July 1, 1980
Subject Category
AIRCRAFT COMMUNICATIONS AND NAVIGATION
Report/Patent Number
A-8003
NASA-TP-1565
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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