Mining Publication: Structural Vibration as a Noise Source on Vibrating Screens
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Original creation date: November 2009
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.
Authors: DS Yantek, HE Camargo
Conference Paper - November 2009
NIOSHTIC2 Number: 20036170
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; :1-10
See Also
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- A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
- Noise Controls for Vibrating Screen Mechanisms
- Practical Application of a Partial Cab to Reduce the A-Weighted Sound Level at the Operator's Station on Surface Drill Rigs
- Results of Noise Measurements from Underground Testing of a Roof Bolting Machine Duty Cycle
- Technology News 536 - NIOSH Develops New Software to Analyze and Reduce Noise Exposure
- Water Well Safety Bits: Health And Safety Information For The Water Well Industry
- Page last reviewed: 9/21/2012
- Page last updated: 9/21/2012
- Content source: National Institute for Occupational Safety and Health, Mining Program