Noise Controls for Vibrating Screen Mechanisms

Details

• Personal Author:
  Alcorn LA ; Camargo HE ; Lowe, Melissa J. ; Shields M ; Yantek, David S.
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Environmental Monitoring Hearing Hearing Loss Mining Noise Occupational Health Safety Vibration
• Keywords:
  Exposure-assessment Exposure-levels Exposure-methods Hearing-conservation Hearing-loss Measurement-equipment Mining-industry Noise-exposure Standards Statistical-analysis Statistical-quality-control Vibration-exposure

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• Series:
  Mining Publications
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Arizona ; OSHA Region 3 ; OSHA Region 9 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OMSHR - Office of Mine Safety and Health Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-5
• NIOSHTIC Number:
  nn:20036539
• Citation:
  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
• Federal Fiscal Year:
  2010
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  2010 SME Annual Meeting and Exhibit, February 28 - March 3, Phoenix, Arizona, Preprint 10-084
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7a90083544f561f76e243cff179690881f7bcc3baa1e6db14212c153b24ad43509dfcd09fdfb57b992a02ca1b2c91691dd3fd914b6c2362194b5695b232341ba
• Download URL:
  https://stacks.cdc.gov/view/cdc/227183/cdc_227183_DS1.pdf
• File Type:
  [PDF - 1.08 MB ]