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Development of roof-bolting machine bit and chuck isolators for drilling noise reductions.

Authors
Peterson-JS; Kovalchik-PG; Yantek-D
Source
Proceedings of the ASME 2009 International Mechanical Engineering Congress & Exposition, IMECE2009, November 13-19, Lake Buena Vista, Florida. IMECE2009-11226, New York: American Society of Mechanical Engineers, 2009 Nov; 15:185-192
NIOSHTIC No.
20036169
Abstract
Among underground coal miners, hearing loss remains one of the most common occupational illnesses. In response, the National Institute for Occupational Safety and Health (NIOSH) conducts research to reduce the noise emission of various underground coal mining equipment, an example of which is a roof bolting machine (RBM). After the removal of coal or rock, the remaining strata may be subject to fall, either from overhead (the roof) or from the side (the rib). One method used in underground coal-mines to prevent failures requires the installation of roof bolts. The roof bolting machine operator trams the machine to the required location, drills a hole into the strata, and then installs a roof bolt, supporting the roof or the rib, as the case may be. Field studies support the premise that, on average, drilling noise is the loudest noise that a roof bolting machine operator would be exposed to and contributes significantly to the operators' noise exposure. NIOSH has determined that the drill steel radiates a significant amount of noise during drilling. NIOSH is developing bit and chuck isolators to reduce vibration, and thus noise radiation of the drill steel, with the longer-term goal of reducing roof bolting machine operator noise exposure. Laboratory testing has shown that operator ear sound pressure levels may be reduced by 3 to 7 dB(A), depending upon the test configuration and drilling media.
Keywords
Control-technology; Engineering-controls; Equipment-design; Exposure-assessment; Exposure-levels; Exposure-methods; Hearing; Laboratory-techniques; Machine-operation; Mining-equipment; Mining-industry; Models; Noise; Noise-control; Noise-exposure; Noise-induced-hearing-loss; Noise-levels; Noise-sources; Occupational-exposure; Occupational-hazards; Underground-mining
Publication Date
20091113
Document Type
Conference/Symposia Proceedings
Fiscal Year
2010
NTIS Accession No.
NTIS Price
ISBN No.
9780791843888
NIOSH Division
PRL
Priority Area
Mining
Source Name
Proceedings of the ASME 2009 International Mechanical Engineering Congress and Exposition (IMECE2009), November 13-19, 2009, Lake Buena Vista, Florida.
State
PA; FL; NY
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