Noise Reduction of Chain Conveyors. Volume II.
Galaitsis-AG; Madden-R; Andersen-D
NTIS: PB/83-262634 :63 pages
This report briefly reviews the aboveground tests performed on a Jeffrey 120m conveyor that were documented in Volume I of this study, and describes the performance of treatments implemented on underground equipment. The noise level at the operator's position in the aboveground test facility was reduced from 101.5 to 91 dba using treatments with satisfactory aboveground durability. Extensive underground evaluation was performed only on the constrained layer damping, which has reduced the conveyor noise by 2 to 6 dba, depending upon the operating conditions, and was shown to be sufficiently durable. Other promising candidates for exploratory evaluation include resilient layers for the top and bottom decks and smoother discontinuities between adjacent conveyor sections.
CP; Final Contract Report;
NTIS Accession No.
Bolt Beranek and Newman Inc.