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)


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a427053.pdf


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