Noise Reduction of Conveyors Used in Underground Coal Mining Machinery.
NTIS: PB/267-787 Available for Reference At Bureau Libraries :132 pages
Discussions are presented of the three phases of the noise reduction program on flight-type coal conveyors. The three phases are identification of noise sources, evaluation of potential noise reduction concepts, and implementation of noise reduction, which is intended to reduce conveyor noise to less than 90 dba in the underground mining environment. The major noise sources are impacts of the chain on the tail roller and on the top and bottom decks. A total noise reduction of 11 dba was achieved by using techniques which are applicable to retrofit. These are a vibration isolated tail roller and an isolated wear strip on the return deck. A theoretical model of isolation provided by the isolated tail roller is developed. Appendices are presented that contain information on other potential concepts and additional data generated.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/267-787 Available for Reference At Bureau Libraries
Bolt, Beranek and Newman Inc