Design of Longitudinal Control Laws for the X-29A Backup Analog Flight Control System.

Abstract

X-29 wind tunnel data were input to the computer program TTYLON to produce alpha/delta c, Nz/delta c, and q/delta c bare airframe transfer functions throughout the flight envelope. The short period mode below Mach 1 was unstable. Where it was stable, the response was slow. The normal acceleration sensor was placed so that the short period frequency would be within the desired range of 3 to 10 rad/sec. Nz feedback was used to stabilize the short period mode. Pitch rate feedback was also used to add damping for Level I flying qualities in the short period mode. To stabilize the phugoid mode and achieve Level I flying qualities, a lag filter design was developed. Gain schedules for KNz and Kq, which were found using classical multiloop control law design are presented. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA137814

Entities

People

  • H. L. Emrick

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Sensors

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Airframes
  • Center Of Gravity
  • Computer Programs
  • Computers
  • Control Surfaces
  • Control Systems
  • Control Systems Engineering
  • Curve Fitting
  • Dynamic Pressure
  • Engineering
  • Flight Control Systems
  • Frequency
  • Swept Wings
  • Transfer Functions
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Aviation Science / Aeronautics.
  • Control Systems Engineering.