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1	A noise control for a roof bolting machine: collapsible drill steel enclosure
Authors	Matetic-RJ; Kovalchik-PG; Peterson-JS; Alcorn-LA
Source	NOISE-CON 2008: Proceedings of the 2008 National Conference on Noise Control Engineering, Dearborn, Michigan, July 28-31, 2008. Burroughs C; Lim T; Kim J; Maling G; eds., Indianapolis, IN: Institute of Noise Control Engineering of the USA, 2008 Jul; :1-7
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NIOSHTIC No.	20034245
Abstract	The National Institute for Occupational Safety and Health (NIOSH) at the Pittsburgh Research Laboratory (PRL) is conducting research to reduce the noise exposures of roof bolting machine operators and to prevent additional cases of Noise Induced Hearing Loss (NIHL) thru the development of engineering noise controls. This paper describes and evaluates an engineering noise control for the roof bolting machine, namely the collapsible drill steel enclosure. The results of the evaluation demonstrated that using the collapsible drill steel enclosure provided a 7 dB(A) reduction in sound pressure level at the operator’s position of a roof bolting machine.
Keywords	Mining-industry; Noise-exposure; Noise-induced-hearing-loss; Hearing-loss; Hearing-impairment; Hearing-disorders; Hearing-conservation; Coal-workers; Coal-miners; Coal-mining; Mining-equipment; Underground-mining; Underground-miners; Miners; Mine-workers; Engineering-controls; Control-technology; Sound-attenuation

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