Accession Number : ADA427053
Title : Assessment Methods for Personal Active Noise Reduction Validated in an International Round Robin (Methodes d'evaluation des protecteurs auditifs a attenuation active du bruit)
Descriptive Note : Technical rept.
Corporate Author : NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)
Report Date : Aug 2004
Pagination or Media Count : 104
Abstract : Hearing protection with standard passive earmuffs is for many military applications insufficient. Low frequency noises (diesel engines, helicopter rotor) require increased attenuation. Active Noise Reduction (ANR) is specifically suited for reduction at low frequencies. Assessment of ANR for military applications is an important topic as the adverse military environment may cause unexpected reduced performance (e.g. very low rotor-blade noise may overload a for civil applications designed system). This study contains assessment methods for ANR in military applications from five laboratories.
Descriptors : *HUMAN FACTORS ENGINEERING , *ACOUSTIC MEASUREMENT , *NOISE REDUCTION , DIESEL ENGINES , ENVIRONMENTS , MILITARY AIRCRAFT , PASSIVE SYSTEMS , HELICOPTER ROTORS , ADVERSE CONDITIONS , MILITARY APPLICATIONS , ATTENUATION , CIVIL AFFAIRS , LOW FREQUENCY , HEARING , NOISE(SOUND) , AIRCRAFT NOISE , EAR PROTECTORS
Subject Categories : Acoustics
Military Aircraft Operations
Distribution Statement : APPROVED FOR PUBLIC RELEASE