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A comparison of time-optimal interception trajectories for the F-8 and F-15The simulation results of a real time control algorithm for onboard computation of time-optimal intercept trajectories for the F-8 and F-15 aircraft are given. Due to the inherent aerodynamic and propulsion differences in the aircraft, there are major differences in their optimal trajectories. The significant difference in the two aircrafts are their flight envelopes. The F-8's optimal cruise velocity is thrust limited, while the F-15's optimal cruise velocity is at the intersection of the Mach and dynamic pressure constraint boundaries. This inherent difference necessitated the development of a proportional thrust controller for use as the F-15 approaches it's optimal cruise energy. Documented here is the application of singular perturbation theory to the trajectory optimization problem, along with a summary of the control algorithms. Numerical results for the two aircraft are compared to illustrate the performance of the minimum time algorithm, and to compute the resulting flight paths.
Document ID
19900012437
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Calise, Anthony J. (Georgia Inst. of Tech. Atlanta, GA, United States)
Pettengill, James B. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NAS 1.26:186300
NASA-CR-186300
Accession Number
90N21753
Funding Number(s)
CONTRACT_GRANT: NCC2-506
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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