Vibration and Acoustic Environment of AH-1G Helicopter

Abstract

Vibration and acoustic measurements were made on an AH-1G Helicopter equipped with 7.62 millimeter machine guns, a 40-millimeter grenade launcher, and 7-tube and 19-tube, 2.75-inch rocket launchers to determine the vibration and acoustic environment throughout the helicopter. Tape recordings from 96 accelerometers and 12 microphones were made during various flight conditions and during armament fire. Spectrum analyses were conducted to determine vibratory double amplitude (DA), acceleration, power spectral density (PSD), and sound pressure levels (SPL) versus frequency. Amplitude probability density (APD) plots also are included. Measured vibration and acoustic data are compared with military standards and specification requirements.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1975
Accession Number
ADB004205

Entities

People

  • Phyllis G. Bolds
  • Virgil C. Mcintosh

Organizations

  • Flight Dynamics Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Measurement
  • Air Force
  • Frequency
  • Grenade Launchers
  • Helicopters
  • Launchers
  • Machine Guns
  • Measurement
  • Military Standards
  • Rocket Launchers
  • Sound Pressure
  • Spectrum Analysis
  • Standards
  • Tape Recording
  • Test And Evaluation
  • Vibration

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Munitions and Ordnance Engineering