Accession Number : AD0919273

Title :   Vibration and Acoustic Environment of UH-1C Helicopter Configured with and Using M-5 and XM-21 Armament.

Descriptive Note : Final rept.,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : McIntosh, Virgil C. ; Bolds, Phyllis G.

Report Date : FEB 1974

Pagination or Media Count : 237

Abstract : Vibration and acoustic measurements were made on a UH-1C helicopter equipped with machine guns, a grenade launcher, and rocket launchers to determine vibration and acoustic environment throughout the vehicle. Tape recordings from 96 accelerometers and 12 microphones were made during all flight conditions and armament operation. Spectrum analyses were performed to obtain vibratory double amplitude, acceleration power spectral density, and sound pressure level versus frequency. Amplitude probability density plots also are included. Measured vibration and acoustic data are compared with military standards and specifications requirements. (Author)

Descriptors :   (*AIRCRAFT FIRE CONTROL SYSTEMS, VIBRATION), (*HELICOPTERS, NOISE), GUNFIRE, MACHINE GUNS, GRENADE LAUNCHERS, ROCKET LAUNCHERS, AMPLITUDE, ACCELERATION, ACCELEROMETERS, POWER SPECTRA, DENSITY, PRESSURE, FREQUENCY, MEASUREMENT, COMPATIBILITY, MICROPHONES.

Subject Categories : Helicopters
      Acoustic Detection and Detectors
      Fire Control and Bombing Systems
      Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE