Helicopter Flight Control System Design Using the Linear Quadratic Regulator for Robust Eigenstructure Assignment

Abstract

This thesis applied modern, multi-variable control design techniques, via a FORTRAN computer algorithm, to U.S. Army helicopter models in hovering flight conditions. Eigenstructure assignment and Linear Quadratic Regulator (LQR) theory are used to achieve enhanced closed loop performance and stability characteristics with full state feedback. The addition of cross coupling weights to the standard LQR performance index is specifically addressed. A desired eigenstructure is chosen with a goal of reduced pilot workload via performance qualities requirements. Cross coupling weighting is shown to provide greater flexibility in achieving a desired closed loop eigenstructure. While the addition of cross coupling weighting is shown to eliminate stability margin guarantees associated with LQR methods, the modified algorithm can achieve a closer match to a desired eigenstructure than previous versions of the program while maintaining acceptable stability characteristics.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1992
Accession Number
ADA258904

Entities

People

  • Dempsey D. Solomon

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Algorithms
  • Attack Helicopters
  • Closed Loop Systems
  • Computer Programs
  • Computers
  • Control Systems
  • Feedback
  • Flight Control Systems
  • Helicopters
  • Multiple Input Multiple Output
  • Rotary Wing Aircraft
  • Standards
  • United States

Readers

  • Aviation Science / Aeronautics.
  • Control Systems Engineering.