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Noise source identification on a stageloader system.

Camargo-HE; Yantek-DS; Randolph-R; Schwartz-K; Ravetta-P; Burdisso-R
NOISE-CON 2013. The 28th Conference of the Institute of Noise Control Engineering, August 26 - 28, 2013, Denver, Colorado. Washington, DC: The Institute of Noise Control Engineering of the USA, 2013 Aug; :NC13-110
Longwall mines provide approximately half of the U.S. national underground coal production. However, longwall systems often expose workers to hazardous noise. The National Institute for Occupational Safety and Health (NIOSH) measured sound levels well over 100 dB(A) at worker locations. Furthermore, 48% of noise samples collected at shearer longwalls by the Mine Safety and Health Administration exceeded that agency's permissible exposure level. NIOSH is currently conducting research to develop noise controls for longwall systems. The two most significant sound-radiating components of a longwall system are the shearer and the stageloader. This paper presents a noise source identification effort for a stageloader as the first step to developing noise controls. Due to the lack of instrumentation approved for use in underground coal mines, the present study was conducted on a new stageloader in a manufacturer's building. A 63-microphone array was used for the test and data were processed using conventional beamforming. Results showed that the frequency content of the most prominent sources was towards the lower end of the spectrum (<1,900 Hz). The location of the most dominant sources was in the region of the electric motor and where the conveyor chain either radiated noise itself or directly excited other component such as the side wall plates on the output side.
Noise; Noise-levels; Noise-measurement; Sound; Hearing; Ears; Permissible-limits; Exposure-assessment; Exposure-levels; Exposure-limits; Noise-induced-hearing-loss; Short-term-exposure; Machine-tools; Air-pressure; Power-generation; Cutting-tools; Longwall-mining; Mining-industry; Coal-mining; Models
Hugo E. Camargo, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 626 Cochrans Mill Road, Pittsburgh, PA 15236
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NOISE-CON 2013. The 28th Conference of the Institute of Noise Control Engineering, August 26 - 28, 2013, Denver, Colorado