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Noise control for the pneumatic rock drill.

Public Domain


Details

  • Personal Author:
  • Description:
    Unmodified pneumatic rock drills may have noise levels of 115 to 130 db at the operator's position. Experimental modifications have been made to a standard drill to suppress the noise from the three main sources: the air exhaust noise, the noise radiated from the drill, and the resonance noise of the steel drill rods. A prototype model developed at the Bureau of Mines, Rolla Metallurgy Research Center, operates at a noise level below 100 db. A close-fitting case and muffler unit, consisting of a metallic skeleton filled with viscoelastic absorber and having a durable cover, provided both muffling and noise absorption. Damping alloys were used at strategic points in the drill. Drill steel resonance noise was reduced by a constrained-layer treatment on the outside of the drill rod. The singular and combined effects of the treatments are presented in detail. [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    RORC - Rolla Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    1-17
  • NIOSHTIC Number:
    nn:10010613
  • Citation:
    Ann Mtg SME AIME Chicago Illinois SME Preprint 73-Au-62 Feb 25 - 1973 Mar; :17 pages
  • Federal Fiscal Year:
    1973
  • Peer Reviewed:
    False
  • Source Full Name:
    Ann. Mtg., SME, AIME, Chicago, Illinois, SME Preprint 73-Au-62, Feb. 25 - Mar. 1, 1973
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
  • Download URL:
  • File Type:
    Filetype[PDF - 168.02 KB ]
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