Analysis of the FDL-8 Lifting Body Lateral-Directional Modes and Preliminary Design of a Stability Augmentation System for Subsonic Flight.

Abstract

The problem was to determine if the FDL-8 manned re-entry vehicle lateral-directional modes have clearly adequate pilot handling qualities in subsonic flight. If not, a SAS was to be designed. Lateral characteristics for 21 subsonic flight conditions were obtained from linearized aircraft lateral equations. Assumptions were that symmetrical reference flight conditions and small-perturbation theory apply. The characteristics compared with requirements for highest level handling qualities showed a SAS was required. A two-loop SAS was designed using Root-Locus techniques. The yaw damper loops included undesirable Roll-Spiral coupling but the roll damper, second loop suppressed the Roll-Spiral coupling. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1971
Accession Number
AD0730150

Entities

People

  • Gat M. Chin

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Couplings
  • Directional
  • Equations
  • Flight
  • Lifting Bodies
  • Perturbation Theory
  • Perturbations
  • Subsonic Flight
  • Vehicles

Readers

  • Aviation Science / Aeronautics.
  • Control Systems Engineering.
  • Fluid Dynamics.