Engineering measures for noise abatement of mine vent fans and ductwork.
Leasure-J; Tinianov-B; Nakagawa-M
NOISE-CON 2003: Proceedings of the 2003 National Conference on Noise Control Engineering, Cleveland, Ohio, June 23-25, 2003. Holger DK, Maling Jr. GC, eds., Ames, IA: Institute of Noise Control Engineering of the USA, 2003 Jun; :1-10
Mine ventilation fans and their attached ductwork were identified as major noise sources in the underground coal mining environment. The sound intensity levels of two ventilation fans from the subject coal mine were measured and compared. The two fans were 34-inch diameter ventilation fan in both refurbished and worn conditions. The intensity levels of the worn unit yielded levels 10 to 30 dBA higher than those of the refurbished fan. It was also found that the unlined fiberglass ducts had little noise attenuation. In addition, they were acting as a noise source along their entire path and re-radiating the fan noise significant distances from the unit. In an attempt to predict the effectiveness of noise reduction techniques in the system, a model of the duct has been modeled using the statistical energy analysis (AutoSEA2) software. By changing the physical properties of the duct (i.e. adding insulation) via the model, predictions were made regarding noise reduction. Cost effective and viable physical noise reduction techniques for the system can then be ensured prior to implementation. In the future, these characteristics can be used to model the duct as a noise source in larger simulations.
Hearing-loss; Noise; Noise-exposure; Noise-induced-hearing-loss; Noise-levels; Engineering-controls; Mining-equipment; Underground-mining; Coal-mining; Control-technology; Noise-measurement; Noise-propagation; Noise-sources; Noise-transmission; Statistical-analysis; Statistical-quality-control; Ventilation-equipment; Ventilation-systems
NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Holger-DK; Maling-GC Jr.
NOISE-CON 2003: Proceedings of the 2003 National Conference on Noise Control Engineering, Cleveland, Ohio, June 23-25, 2003
Colorado School of Mines