Accession Number : ADA296871

Title :   Sound Attenuation Evaluation of the Navy's HGU-84/P Helicopter Helmet.

Descriptive Note : Technical memo.,

Corporate Author : NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL

Personal Author(s) : Maxwell, D. W. ; Williams, C. E.

PDF Url : ADA296871

Report Date : JAN 1995

Pagination or Media Count : 18

Abstract : First article sound attenuation tests were conducted on samples of the HGU-84/P helicopter helmet, candidate replacement for the SPH-3C series of helmets, supplied for evaluation by the Naval Air Warfare Center Aircralt Division, Warminster, Pennsylvania. The tests were conducted in accordance with American National Standard ANSI 512.6-1984, Method for the Measurement of Real-Ear Attenuation of Hearing Protectors. Objective measurements of attenuation, microphone-in-real-ear (MIRE), were also obtained for database and record purposes. Ten Marine Corps student aviators in the Naval Aviation Flight Training Program served as volunteer test subjects. Real-ear attenuation values calculated from measurements made at the nine, one-third octave test frequencies met or exceeded the required minimum real-ear attenuation specifications for the newly developed helmet. This technical memorandum documents the results of the sound attenuation tests. The HGU-84/P helmet is currently being fielded as a replacement for the SPH-3C helmet. (AN)

Descriptors :   *ACOUSTIC ATTENUATION, *FLIGHT HELMETS, TEST AND EVALUATION, DATA BASES, FREQUENCY, MILITARY REQUIREMENTS, PILOTS, HELICOPTERS, ACOUSTIC MEASUREMENT, MICROPHONES, HEARING, AIRCRAFT NOISE, EAR PROTECTORS.

Subject Categories : Acoustics
      Protective Equipment
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE