With the large-scale mechanization inherent to the mining industry, noise-induced hearing loss remains a major concern. As part of on-going efforts to develop engineering controls to reduce noise levels in longwall mining, active noise control experiments were conducted above ground on a modified non-working stageloader. Recorded underground stageloader noise was broadcast into the above ground stageloader. The result was an average 7 dBA reduction when the active noise control was applied. These results suggest the possibility that active noise reduction can be a useful means to reduce stageloader noise if the control system can be made sufficiently rugged. The study was divided into two phases. First, underground noise surveys were carried out at two different mines. The second phase of the study were the Active Noise Cancellation ANC experiments on the above ground non-operational stageloader.
Transactions of the Society for Mining, Metallurgy, and Exploration
Slagley, J.M., and S.E. Guffey. (2006). Active noise control of stageloader noise in longwall mining. 2005 Transactions of the Society for Mining, Metallurgy, and Exploration, Inc., 318, 154-160. Found in DTIC, ADA430212.