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Mining Publication: Noise Reduction of a Pneumatic Rock Drill
Keywords: Drills Noise Noise and vibration control
Original creation date: November 1975
Authors: A Visnapuu, JW Jensen
Report of Investigations - November 1975
Download PDF Document (4.77 MB)
NIOSHTIC2 Number: 10000269
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8082, 1975 Nov; :1-23
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.
Image of publication Noise Reduction of a Pneumatic Rock DrillReport of Investigations - November 1975
Download PDF Document (4.77 MB)
NIOSHTIC2 Number: 10000269
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8082, 1975 Nov; :1-23
See Also
Analysis of a Mechanism Suspension to Reduce Noise from Horizontal Vibrating Screens
Determination of Sound Exposures (DOSES): Software Manual and Implementation Guide
The Evolution of Drill Bit and Chuck Isolators to Reduce Roof Bolting Machine Drilling Noise
Modified Tail Section Reduces Noise on a Continuous Mining Machine
Noise Abatement of Pneumatic Rock Drill
A Noise Control for A Roof Bolting Machine: Collapsible Drill Steel Enclosure
Sound Power Level Study of a Roof Bolter
Technology News 536 - NIOSH Develops New Software to Analyze and Reduce Noise Exposure
Technology News 538: Acoustic Enclosure to Reduce Noise From Vibrating Screen Mechanism Housings
Water Well Safety Bits: Health And Safety Information For The Water Well Industry
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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