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Development of a Quiet Rock Drill. Volume 2 - Sources of Drill Rod Noise.

Authors
Hawkes-I; Wright-DD; Dutta-PK
Source
NTIS: PB/289-716 Available for Reference At Bureau Libraries :77 pages
Link
NIOSHTIC No.
10000182
Abstract
This report describes how longitudinal and bending stress waves in percussive drill rods generate noise. It is shown that in practical drills the largest noise source is the bending waves, which are mainly generated because of imperfections in the piston, chuck, and drill rod alinement. Equations are presented that enable the noise spectra generated by the bending and longitudinal waves to be precisely predicted. Means for reducing the amplitude of the bending waves are discussed.
Publication Date
19770101
Document Type
CP; Final Contract Report;
Fiscal Year
1977
NTIS Accession No.
PB-289716
NTIS Price
A06
Identifying No.
OFR 132-78
NIOSH Division
PRC;
Source Name
NTIS: PB/289-716 Available for Reference At Bureau Libraries
Performing Organization
Ivor Hawkes Associates
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