Demonstration of Frequency-Sweep Testing Technique Using a Bell 214-ST Helicopter

Abstract

A demonstration of frequency-sweep testing using a Bell-214ST single- rotor helicopter was completed in support of the Army's development of an updated MIL-H-8501A, and an LHX (ADS-33) handling-qualities specification. Hover and level-flight condition (Va = 0 knots and Va = 90 knots) tests were conducted in 3 flight hours by Army test pilots at the Army Aviation Engineering Flight Activity (AEFA) at Edwards AFB, CA. Bandwidth and phase-delay parameters were determined from the flight-extracted frequency responses as required by the proposed specifications. Transfer-function modeling and verification demonstrates the validity of the frequency-response concept for characterizing closed-loop flight dynamics of single-rotor helicopters--even in hover. This report documents the frequency-sweep flight-testing technique and data-analysis procedures. Special emphasis is given to piloting and analysis considerations which are important for demonstrating frequency-domain specification compilance.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1987
Accession Number
ADA182361

Entities

People

  • Jay W. Fletcher
  • Mark B. Tischler
  • Randall W. Cason
  • Robert A. Williams
  • Vernon L. Diekmann

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Aircrafts
  • Army Aviation
  • Atmospheric Motion
  • Data Analysis
  • Dynamic Response
  • Engineering
  • Fixed Wing Aircraft
  • Flight Crews
  • Flight Testing
  • Frequency
  • Frequency Domain
  • Frequency Response
  • Instrumentation
  • Pilots
  • Resonant Frequency
  • Transport Aircraft
  • Waveforms

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Control Systems Engineering.
  • Maritime Security/Maritime Homeland Security