The Noise of Mobile Machines Used in Surface Coal Mines: Operator Exposure, Source Diagnosis, Potential Noise Control Treatments.
Ungar-EE; Andersen-DW; Rubin-MN
NTIS: PB 299-538 :117 pages
A summary of earlier work is presented indicating that about 25,000 machine operators employed in U.S. surface coal mines (or about 45 pct of all such operators) suffer greater noise exposures than are permitted by the Federal Coal Mine Health and Safety Act of 1969, with the predominant fraction of these overexposures ascribable to tracked dozers, wheeled front-end loaders, haulers, and diesel- powered shovels and draglines . The results of noise studies of two dozers, three loaders, and two draglines are discussed, and their predominant noise sources and source-to-operator transmission paths are identified. Estimates are developed of the retrofits needed to quiet these machines to bring them into compliance with the act.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 299-538
Bolt, Beranek & Newman, Inc.