Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Noise Control of an Underground Load-haul-dump Machine.

Authors
Huggins-GG; Madden-R; Murray-BS
Source
NTIS: PB/288-854 Available for Reference At Bureau Libraries :79 pages
Link
NIOSHTIC No.
10000184
Abstract
Diagnostic tests were performed on a production st-5a load-haul-dump (lhd) machine manufactured by Wagner Mining Machinery Coompany To evaluate and rank order noise sources. The evaluation indicated that the major noise sources were the transmission, the engine, and the cooling fan. The evaluation was followed by implementation of recommended noise control treatments which included vibration isolation of the transmission, a transmission enclosure, an engine enclosure, and modifications of the inlet to the cooling fan. The final step in the program was an underground operational period at the National Gypsum Mine in Shoals, Indiana. The noise control treatments successfully reduced the lhd operator noise exposure by 7 dba, thus increasing its allowable operation time by a factor of 2.7. Actual measurements made underground using noise dosimeters indicated that, during a typical shift, the noise control treatments reduced the fractional exposure to an allowable level. The report discusses the mechanical aspects of the lhd, its noise sources, the treatments applied, the final levels achieved, and field experience with the noise-controlled machine.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-288854
NTIS Price
A06
Identifying No.
OFR 125-78
NIOSH Division
PRC;
Source Name
NTIS: PB/288-854 Available for Reference At Bureau Libraries
State
IN;
Performing Organization
Bolt, Beranek and Newman Inc
TOP