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A dual sprocket chain as a noise control for a continuous mining machine.

Authors
Smith-AK; Kovalchik-PG; Alcorn-LA; Matetic-RJ
Source
Noise Control Eng J 2009 Sep; 57(5):413-419
NIOSHTIC No.
20036103
Abstract
Over-exposure to noise remains a widespread, serious health hazard in the U.S. mining industry despite 25 years of regulation. Most other categories of illnesses and injuries associated with mining have improved, with the exception of hearing loss. In order to reduce cases of Noise Induced Hearing Loss (NIHL) in the mining industry, retrofit acoustic treatments and controls are being developed to subdue noise at the source. The Mine Safety and Health Administration (MSHA) coal noise sample data collected from 2000 to 2005 has determined that continuous mining machines rank first among all mining equipment whose operators exceed 100% noise dosage. The continuous mining machine conveyor, used to move coal from the cutting face to the rear of the machine, has been identified as a dominant noise source. A dual sprocket conveyor chain was tested as a potential solution. Sound power level measurements conducted at the Pittsburgh Research Laboratory (PRL) accredited reverberation chamber showed a 3 dB reduction in the A-weighted sound power level when the dual sprocket chain was implemented. Underground results show an 8-hour TimeWeightedAverage „TWA8 hrs… reduction a 3 dB for continuous mining machine operators. Utilizing this newly developed noise control, along with previously proven controls, provides continuous mining machine operators an opportunity to be within the MSHA-Permissible Exposure Limit (MSHA-PEL).
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
Contact
Adam K. Smith, National Institute of Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Cochrans Mill Road, Pittsburgh PA 15236
CODEN
NCEJD5
Publication Date
20090901
Document Type
Journal Article
Email Address
eyv7@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0736-2501
NIOSH Division
PRL
Priority Area
Mining
Source Name
Noise Control Engineering Journal
State
PA
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