Retrofit Noise Control of Underground Load-haul-dump Machines.
NTIS: PB/86-145810 :110 pages
The primary objective of this work was to extend the noise control technology developed under earlier projects to a wider range of load- haul-dump models to evaluate the general applicability of these techniques. Noise control treatments were designed, fabricated, and installed on three load-haul-dump machines (two 2-yd3 models and one 8-yd3 model) selected as demonstration machines for this project. The machines were evaluated either in production mines or at the Bureau's Lake Lynn mine. The results indicate that it is possible to achieve overall noise reductions of between 4 and 8 db using these techniques. Engine cooling and seal design were determined to be important design issues in such treatments.
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