Force Determination Sensitivities Study for Full-Scale Helicopter Ground Vibration Testing

Abstract

A fundamental objective of the Army's research and development efforts is to increase the reliability of the Army's air mobility force, which consists primarily of rotary-wing aircraft. Excessive vibrations have always been a problem for helicopters due to the vibratory airloads generated by the main rotor as it moves edgewise through the air. Maintenance and part replacement costs require that potential vibration problems be diagnosed as early as possible in the helicopter development and fielding cycle. A methodology known as Force Determination which was developed in the early 1970's is applicable to early diagnosis of vibration-induced problems. The objective of this program was to evaluate the limitations and accuracy of the Force Determination method. Controlled laboratory experiments and numerous sensitivity studies were performed to assess the validity of this method.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1989
Accession Number
ADA215983

Entities

People

  • Keith Hoff
  • Nick Calapodas

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Acquisition
  • Actuators
  • Aircrafts
  • Airframes
  • Army Aviation
  • Corporations
  • Dynamic Response
  • Flight Loads
  • Government Procurement
  • Load Cells
  • Measurement
  • Phase Shift
  • Resonant Frequency
  • Rotary Wing Aircraft
  • Tail Rotors
  • Test Facilities

Readers

  • Acoustics.
  • Aerospace Engineering
  • Systems Analysis and Design