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Analysis of a mechanism suspension to reduce noise from horizontal vibrating screens.

Authors
Yantek-DS; Lowe-MJ
Source
Noise Control Eng J 2011 Nov-Dec; 59(6):568-580
NIOSHTIC No.
20040108
Abstract
A-weighted sound levels around vibrating screens in coal preparation plants often exceed 90 dB. The National Institute for Occupational Safety and Health (NIOSH) is developing noise controls to reduce noise generated by horizontal vibrating screens. Horizontal vibrating screen noise is dominated by sound radiated from the screen body. NIOSH researchers analyzed a mechanism suspension system that could reduce screen body-radiated noise. A finite element (FE) model of the entire screen was used to analyze the screen with the added mechanism suspension. The spring rates for the mechanism suspension were tuned to transmit vibration at the mechanism operating speed while attenuating vibration transmitted from the mechanisms to the screen body at frequencies above 100 Hz. The FE results were used to estimate the A-weighted sound power level radiated by the screen sides and feedbox for various mechanism suspension spring rates. The results indicate that a tuned mechanism suspension could reduce the A-weighted sound power level radiated by the screen body due to gear and bearing forces inside the mechanisms by 7 to 18 dB.
Keywords
Mining-industry; Mineral-processing; Coal-mining; Coal-processing; Noise; Noise-control; Engineering-controls; Control-technology
Contact
David S. Yantek, NIOSH, 626 Cochrans Mill Rd, P.O.Box 18070, Pittsburgh, PA 15236
CODEN
NCEJD5
Publication Date
20111101
Document Type
Journal Article
Email Address
DYantek@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B01182012
Issue of Publication
6
ISSN
0736-2501
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Noise Control Engineering Journal
State
PA
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