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Evaluation of stiffeners for reducing noise from horizontal vibrating screens.

Authors
Yantek-DS
Source
NOISE-CON 2010: Proceedings of the 2010 National Conference on Noise Control Engineering and 159th Meeting of the Acoustical Society of America, Baltimore, Maryland, April 19-21, 2010. Burroughs CB; Maling G; eds., Indianapolis, IN: Institute of Noise Control Engineering of the USA, Paper No. NC 10-147, 2010 Apr; :1-14
Link
NIOSHTIC No.
20036771
Abstract
Sound levels around vibrating screens in coal preparation plants often exceed 90 dB(A). The National Institute for Occupational Safety and Health (NIOSH) is developing noise controls to reduce noise generated by horizontal vibrating screens. NIOSH researchers used finite element analysis (FEA) and a NIOSH-written program to estimate the sound power level reduction resulting from adding rib stiffeners to key locations on the sides of a screen. The researchers evaluated adding rib stiffeners made from steel channel with two different cross-sections (C and T) and the effects of orienting the stiffeners horizontally and vertically. In addition, the researchers investigated the effects of increasing the modal damping from 0.002 to 0.010. The results indicate that for a broadband input, adding stiffeners had little impact on the estimated sound power level, but increasing the modal damping reduced the predicted A-weighted sound power level by 7.8 dB.
Keywords
Coal-processing; Engineering-controls; Exposure-assessment; Exposure-levels; Exposure-methods; Hearing; Hearing-loss; Mining-industry; Noise; Noise-control; Noise-induced-hearing-loss; Noise-levels; Noise-measurement; Noise-sources; Occupational-exposure; Sound-attenuation; Statistical-analysis; Vibration-control; Vibration-effects; Vibration-exposure; Vibration-suppressors; Work-environment; Work-operations; Work-performance; Work-practices
Contact
David S. Yantek, NIOSH/OMSHR, PO Box 18070, Pittsburgh, PA 15236
Publication Date
20100419
Document Type
Conference/Symposia Proceedings
Email Address
dyantek@cdc.gov
Editors
Burroughs-CB; Maling-G
Fiscal Year
2010
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
NOISE-CON 2010: Proceedings of the 2010 National Conference on Noise Control Engineering and 159th Meeting of the Acoustical Society of America, Baltimore, Maryland, April 19-21, 2010
State
PA; MD; IN
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