Abstract
Results of a three-phase program are presented, during which methods of reducing the operator sound level of coal chain conveyors were examined. The three phases were (1) the identification and quantification of important noise mechanisms, (2) an exploration of several alternative methods to reduce the sound level, and (3) selection and implementation of a set of noise control techniques based on a specific set of objectives and constraints. The basic approach was to reduce operator noise levels (in the underground environment) from values as high as 102 to 90 dBA. The mechanism underlying the generation of conveyor noise is periodic impacts as the chain links encounter different portions of the conveyor body. In a comprehensive testing program, the various impact sources were separated and characterized. Having quantized each individual source, a set of noise control techniques was rationally developed and implemented to obtain a reduction of 11 dBA on a working conveyor. [Work supported by U. S. Bureau of Mines.]
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