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Several prototype pneumatic drill exhaust mufflers using
constricted layer dampener and 27 inches of Tygon tubing
5 other sections not shown
41-inch drill rod 6-inch constricted layer ABATEMENT OF PNEUMATIC aluminum Atlas Copco BBC-17 bill of material bit noise bolter operator Bureau of Mines C. R. Summers chuck end Compressor exhaust pressure constricted layer dampener dampened rod dbA fig decibels Devcon drill body DRILL by C. R. drill noise control drill noise level drill steel noise drilling into sandstone E-A-R energy absorbing exhaust noise exhaust port external muffler feed leg FIGURE B-19 FIGURE B-20 FIGURE B-7 Flexane FREQUENCY frequency analysis hose clamps Ingersoll-Rand stoper installed integral muffler system J. N. Murphy jacket muffler mechanical noise Metallurgy Research Center muffler jacket neoprene noise exposure noise sources pneumatic drill PNEUMATIC ROCK DRILL prototype mufflers reduced rod with 6-inch Rolla Metallurgy Research separate muffler system shown in figure sinker drill sound level meter split end cap steel tubing Summers and J. N. TABLE A-l totally covered rod Tygon urethane viscoelastic