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

Development of elastomeric isolators to reduce roof bolting machine drilling noise.

Authors
Michael-R; Yantek-D; Johnson-D; Ferro-E; Swope-C
Source
Noise Control Eng J 2011 Nov-Dec; 59(6):591-612
NIOSHTIC No.
20040212
Abstract
Among underground coal miners, hearing loss remains one of the most common occupational illnesses. In response to this problem, the National Institute for Occupational Safety and Health (NIOSH) Office of Mine Safety and Health Research (OMSHR) conducts research to reduce the noise emission of underground coal-mining equipment, an example of which is a roof bolting machine. Field studies show that, on average, drilling noise is the most significant contributor to a roof bolting machine operator's noise exposure. NIOSH OMSHR has determined that the drill steel and chuck are the dominant sources of drilling noise. NIOSH OMSHR, Corry Rubber Corporation, and Kennametal, Inc. have developed a bit isolator that breaks the steel-to-steel link between the drill bit and drill steel and a chuck isolator that breaks the mechanical connection between the drill steel and the chuck, thus reducing the noise radiated by the drill steel and chuck, and the noise exposure of the roof bolter operator. This paper documents the evolution of the bit isolator and chuck isolator including various alternative designs which may enhance performance. Laboratory testing confirms that production bit and chuck isolators reduce the A-weighted sound level generated during drilling by 3.7 to 6.6 dB. Finally, this paper summarizes results of a finite element analysis used to explore the key parameters of the drill bit isolator and chuck isolator to understand the impact these parameters have on noise.
Keywords
Mining-industry; Underground-mining; Coal-mining; Underground-miners; Coal-miners; Hearing-loss; Hearing-conservation; Hearing-impairment; Hearing; Noise-induced-hearing-loss; Noise-control; Noise-exposure; Noise-shielding; Mining-equipment; Control-technology; Engineering-controls
Contact
David Yantek, NIOSH, 626 Cochrans Mill Rd, Pittsburgh, PA 15236 USA
CODEN
NCEJD5
Publication Date
20111101
Document Type
Journal Article
Email Address
dcy6@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Issue of Publication
6
ISSN
0736-2501
NIOSH Division
OMSHR
Source Name
Noise Control Engineering Journal
State
PA
TOP