Accession Number : ADA138093

Title :   Multivariable Digital Flight Control Design for the FPCC (Flight Propulsion Control Coupling) Aircraft.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Simmers,J A

PDF Url : ADA138093

Report Date : Dec 1983

Pagination or Media Count : 112

Abstract : Multivariable design techniques developed by Professor Brian Porter of the University of Salford, England, are used to develop digital control laws for the Flight Propulsion Control Coupling (FPCC) Aircraft. Control laws are developed for each of three flight conditions. A design tool, the computer program MULTI, is modified to calculate and display the figures of merit for each simulation. The controllers developed utilize output feedback with proportional plus integral (PI) control. Due to the nature of the system model, certain derivatives of the states are measured and added to the feedback. A robust controller is tested by performing specific maneuvers for multiple flight conditions, and these results are compared to those obtained with the controllers designed for each flight condition. The individual controllers and the robust controller are tested with the addition of a delay that represents the processing delay within the proportional plus integral implementation. The results with delay are compared to those without delay. All of the designs accomplished included first order models for the control surface actuators and assumed perfect knowledge of all aircraft states. The designs used reduced order state models with decoupled lateral and longitudinal models. (Author)

Descriptors :   *Flight control systems, *Attitude control systems, Flight maneuvers, Control theory, Digital simulation, Multivariate analysis, Supersonic aircraft, Air superiority fighters, Computer aided design, Theses, Flight simulation, Perturbation theory, Control surfaces

Subject Categories : Attack and Fighter Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE