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F100 Multivariable Control Synthesis Program Volume I - Development of F100 Control System

Report Number: AFAPL-TR-77-35 Volume I
Author(s): De Hoff, Ronald L., W. Earl Hall, Jr., Richard J. Adams and Narendra K. Gupta
Corporate Author: Systems Control, Inc.
Laboratory: Air Force Aero-Propulsion Laboratory
Date of Publication: 1977-06
Pages: 324
Contract: F33615-75-C-2053
Project: 3066
Task: 306603
AD Number: ADA052420

Abstract:
The objective of the F100 multivariable controls program was to demonstrate modern control design methodology applied to a state-of-the-art aircraft turbine over its entire flight envelope. Linear quadratic regulator design methods were used to develop feedback gains for a series of operating points. Reference schedules were used to translate pilot and ambient inputs to reference point specifications. A transient controller produced smooth and rapid transitions from one operating point to another. A variable structure integral trim system produced specified steady-state performance and limit accommodation in the presence of simulated degradation effects and instrument errors. The resulting control logic was extensively tested on a hybrid simulation of the F100 turbofan and will be used to control an engine in an altitude test cell. The details of the design procedure, linear model analysis and a summary of digital and hybrid simulation tests results are presented in this report.

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