Details:

Personal Author:
Visnapuu, Aarne ; Jensen, James W.
Visnapuu, Aarne ; Jensen, James W. Less -
Corporate Authors:
United States. Bureau of Mines.
Description:
"Experimental modifications have been made by the Bureau of Mines on standard pneumatic rock drills to reduce the noise of the air exhaust, drill steel resonance noise, and noise radiated by the drill body. A close-fitting case and muffler around the drill body, consisting of a metallic honeycomb skeleton filled with viscoelastic absorber on the inside and a durable outer shell, provide both exhaust and drill body noise muffling and absorption. Drill steel resonance noise is reduced by a constrained-layer treatment consisting of a tubular metal cover bonded to the outside of the rod by a viscoelastic filler. Damping alloy components have been developed to reduce metallic resonance noise. Combined, these modifications have reduced the drilling noise level in granite from 115 dba to 97 dba. Data are presented on the individual and combined effects of these modifications on drilling noise and performance." - NIOSHTIC-2

NIOSHTIC no. 10000269


Subject:
[+]
Noise Control.
Rock-drills.

Series:
Report of investigations (United States. Bureau of Mines) ; 8082
Document Type:
Report
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:c839887386f98e6567dcb9d0ecc2c06cbd7dac4cee253e9cbf35a5052c4c91f8
File Type:

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