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Propulsion System Flow Stability Program (Dynamic). Part XX. Computer Programs for the Root Locus Analysis of Linearized Turbojet and Turbofan Control Systems

Report Number: AFAPL TR 68-142 Part XX
Author(s): Lum, Evan L.
Corporate Author: North American Rockwell Corp Los Angeles CA Los Angeles Div
Laboratory: Air Force Aero Propulsion Laboratory
Date of Publication: 1968-12
Pages: 95
Contract: F33615-67-C-1848
AD Number: AD0853262

Abstract:
This part describes computer programs developed to handle the computational tasks for the linear stability analysis of propulsion controls by root locus techniques. The descriptions, flowcharts, and Fortran program listings of two main programs TJET and TFAN developed for the analysis of turbojet and turbofan engine control systems are presented. Also presented are the descriptions of three subroutines specially developed to facilitate data handling for this study. Examples are given to illustrate the application of computer programs TJET and TFAN. TJET and TFAN have been valuable in the linear analysis of the propulsion system, However, it is recommended that these computer programs be expanded to include the capability of analyzing coupled control loops and to include a limited transient analysis.

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