A Comparison of Nonlinear Algorithms to Prevent Pilot-Induced Oscillations Caused by Actuator Rate Limiting

Abstract

The objective of this study was to compare the ability of the Feedback-with-Bypass (FWB) and the Derivative-Switching (DS) flight control system filters to prevent PIO during actuator rate limiting, and the filters' effects on aircraft handling qualities. This comparison was conducted in three steps: computer simulation, ground simulation in the Large Amplitude Multimode Aerospace Research Simulator (LAMARS), and flight tests conducted in the Variable Stability In-flight Simulator Test Aircraft (VISTA). During computer simulation, the FWB filter better reduced the phase lag and prevented sustained or divergent oscillations during the closed-loop analysis. During both ground simulation and flight tests, the FWB filter was more effective at preventing divergent PIO and improving handling qualities. Overall the FWB filter performed better during all tests.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2003
Accession Number
ADA413992

Entities

People

  • James G. Henley

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Actuators
  • Aeronautical Engineering
  • Air Force
  • Aircraft Models
  • Aircrafts
  • Airframes
  • Computer Simulations
  • Control Surfaces
  • Control Systems
  • Flight Control Systems
  • Flight Simulators
  • Frequency
  • Low Pass Filters
  • Schools
  • Simulations
  • Simulators
  • Sine Waves

Fields of Study

  • Physics

Readers

  • Aquatic Ecology
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Aviation Science / Aeronautics.

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers