Noise Reduction of Jumbo Mounted Percussive Drills: Phase II - Development of Noise Treatment.
Bender-EK; Cruikshank-DB; Rubin-MN
NTIS: PB/286-109 Available for Reference At Bureau Libraries :109 pages
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.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/286-109 Available for Reference At Bureau Libraries
Bolt, Beranek and Newman Inc.