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Structural vibration as a noise source on vibrating screens.

Authors
Yantek-DS; Camargo-HR
Source
Proceedings of the ASME 2009 International Mechanical Engineering Congress & Exposition, IMECE2009, November 13-19, Lake Buena Vista, Florida. IMECE2009-12272, New York: American Society of Mechanical Engineers, 2009 Nov; 15:213-222
NIOSHTIC No.
20036170
Abstract
A-weighted sound levels around vibrating screens in coal preparation plants often exceed 90 dB(A). The National Institute for Occupational Safety and Health (NIOSH) is actively developing noise controls to reduce noise generated by horizontal vibrating screens. A 121-microphone, 3.5-meter-diameter array was used to perform beamforming to determine locations of significant noise radiation on the screen. Below about 1 kHz, the screen body was found to be the most significant noise source. The beamforming contour maps showed several key locations on the sides of the screen and the feedbox are the most significant contributors. Operating deflection shape (ODS) analysis was used to examine the screen behavior under actual operating conditions. This information is helpful in determining how to modify the screen body to reduce the noise radiated by the screen below 1 kHz. The analysis showed modal vibration patterns on the sides and feed box were the main contributors to noise. The results show several areas on the screen sides and feedbox that can be modified to reduce noise.
Keywords
Control-technology; Engineering-controls; Equipment-design; Exposure-assessment; Exposure-levels; Exposure-methods; Hearing; Hearing-threshold; Machine-operation; Mining-equipment; Mining-industry; Models; Noise; Noise-control; Noise-exposure; Noise-induced-hearing-loss; Noise-levels; Noise-sources; Occupational-exposure; Occupational-hazards; Underground-mining; Vibration-effects
Publication Date
20091113
Document Type
Conference/Symposia Proceedings
Fiscal Year
2010
NTIS Accession No.
NTIS Price
ISBN No.
9780791843888
NIOSH Division
PRL
Priority Area
Mining
Source Name
Proceedings of the ASME 2009 International Mechanical Engineering Congress and Exposition (IMECE2009), November 13-19, 2009, Lake Buena Vista, Florida.
State
PA; FL; NY
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