Design of Robust Controllers for a Multiple Input-Multiple Output Control System with Uncertain Parameters Application to the Lateral and Longitudinal Modes of the KC-135 Transport Aircraft

Abstract

A multiple input-multiple output flight control design on the KC-135 aircraft is completed using Quantitative Feedback Theory (QFT). The three degrees-of-freedom model for the lateral mode is reduced to a two degrees-of- freedom model. From this model a robust controller is developed to perform two maneuvers over a wide range of the aircraft flight envelope. The three degrees- of-freedom for the longitudinal mode is then used to develop a robust controller to perform one maneuver. The first and second body bending modes are then added to remove the rigid bosy constraint and a robust control is developed for the non-rigid aircraft. The robust controllers developed for the lateral and longitudinal modes are simulated over a large range of the aircraft's flight envelope. The conclusion drawn from the research is that this method is very effective in designing multiple input-multiple output systems with plant uncertainty. Keywords: Multivariable control, Flight control, Laternal controllers, Longitudinal controllers, Uncertain plants, and Robustness.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1984
Accession Number
ADA153100

Entities

People

  • Harvey H. Russell

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircraft Models
  • Aircrafts
  • Closed Loop Systems
  • Control Surfaces
  • Control Systems
  • Control Systems Engineering
  • Dynamic Pressure
  • Equations Of Motion
  • Flight Control Systems
  • Frequency
  • Frequency Domain
  • Frequency Response
  • Multiple Input Multiple Output
  • Numerical Analysis
  • Sea Level
  • Simulations
  • Transport Aircraft

Readers

  • Electrical Engineering
  • Robotics and Automation.