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:

1974-02-01

Pagination or Media Count:

237.0

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