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Noise controls for vibrating screen mechanisms.

Authors
Lowe-MJ; Yantek-DS; Camargo-HE; Alcorn-LA; Shields-M
Source
2010 SME Annual Meeting and Exhibit, February 28 - March 3, Phoenix, Arizona, Preprint 10-084. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2010 Feb; :1-5
Link
NIOSHTIC No.
20036539
Abstract
National Institute for Occupational Safety and Health (NIOSH) studies show that 43.5% of surveyed coal preparation plant workers had noise exposures exceeding the Mine Safety and Health Administration Permissible Exposure Level. Sound levels around vibrating screens in these plants often exceed 90 dB(A). NIOSH is currently developing noise controls for horizontal vibrating screens. To characterize noise sources, NIOSH researchers performed sound pressure level (SPL) measurements on a vibrating screen at their Pittsburgh Research Laboratory. The results show that the entire screen contributes to noise below 1 kHz and the vibration mechanism housings are most significant above 1 kHz. Constrained layer damping (CLD) treatments and an enclosure were used to reduce mechanism housing noise. These were evaluated using sound power level measurements according to ISO 3744. The CLD treatments reduced the A-weighted sound power level by 3.1 dB in the 1 to 10 kHz one-third-octave bands. A panel-on-frame vibration mechanism enclosure using various types of panels further reduced the A-weighted sound power level from the CLD configuration in the 1 to 10 kHz one-third-octave bands by 3.7, 4.0, and 3.9 dB for aluminum, steel, and Dynalam panels, respectively. The combination yielded a 7 dB reduction from baseline in A-weighted sound power for the same frequency range.
Keywords
Exposure-assessment; Exposure-levels; Exposure-methods; Hearing-conservation; Hearing-loss; Measurement-equipment; Mining-industry; Noise; Noise-exposure; Standards; Statistical-analysis; Statistical-quality-control; Vibration; Vibration-exposure
Publication Date
20100228
Document Type
Conference/Symposia Proceedings
Fiscal Year
2010
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2010 SME Annual Meeting and Exhibit, February 28 - March 3, Phoenix, Arizona, Preprint 10-084
State
PA; AZ
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