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Noise Reduction of Jumbo Mounted Percussive Drills: Phase II - Development of Noise Treatment.

Authors
Bender-EK; Cruikshank-DB; Rubin-MN
Source
NTIS: PB/286-109 Available for Reference At Bureau Libraries :109 pages
Link
NIOSHTIC No.
10000173
Abstract
Diagnostic studies were performed on a Gardner-Denver DH122 drill to determine the contributions of major sources to the total radiated noise spectrum. In addition, noise control treatment was designed, developed, and evaluated. The treatment involved an integral enclosure-muffler for the drifter, vibration isolation of the drifter from the enclosure and feed, and a sheath mounted to the drill steel by elastomeric bushings. Performance tests show that there is no impact of treatment on drill rate. Problems with exhaust icing and lack of adherence of the elastomeric bushings to the drill steel remain to be solved.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-286109
NTIS Price
A07
Identifying No.
OFR 106-78
NIOSH Division
PRC;
Source Name
NTIS: PB/286-109 Available for Reference At Bureau Libraries
Performing Organization
Bolt, Beranek and Newman Inc.
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