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Laboratory measurements of air carbon arcing sound power levels.

Authors
Miller-RE; Peterson-JS
Source
NOISE-CON 2011. The 25th Conference of the Institute of Noise Control Engineering, July 25 - 27 2011, Portland, Oregon. Washington, DC: The Institute of Noise Control Engineering of the USA, 2011 Jul; :1-9
NIOSHTIC No.
20039291
Abstract
Investigative field reports show that air carbon arcing generates sound levels between 108 dB(A) and 120 dB(A) at the operator's ear. Sound levels above 115 dB(A) are in excess of the Mine Safety and Health Administration (MSHA) compliance limit, potentially resulting in hearing loss from short-term exposure. The National Institute for Occupational Safety and Health (NIOSH) is conducting research to understand the effects of air carbon arcing parameters on the noise produced, specifically to reduce hearing loss in the mining industry. Repeatable laboratory experiments have been conducted in an accredited reverberation chamber to measure the sound power levels generated by air carbon arcing. To reduce variability between gouges, air carbon arcing was performed using an automated machine with consistent sample material. Typical electrodes, 1.27 cm (1/2 in) and 0.95 cm (3/8 in) in diameter, were investigated. Amperage, air pressure, and gouging speed were measured. This paper will describe the measurement procedures and document the results obtained. The implications in terms of how the parameters affect the generated sound power will be discussed. The largest effects were seen by altering the amperage and air pressure settings. The highest sound power level measured was 130 dB(A), when gouging with a 1.27-cm electrode. The lowest sound power level observed was 116 dB(A), using a 0.95-cm electrode. Lowering current to the minimum effective setting had a larger effect than lowering the air pressure. However, lowering both current and air pressure to the minimum effective settings produced the lowest observed sound power levels.
Keywords
Noise; Noise-levels; Noise-measurement; Sound; Hearing; Ears; Mining-equipment; Mining-industry; Permissible-limits; Exposure-assessment; Exposure-levels; Exposure-limits; Noise-induced-hearing-loss; Short-term-exposure; Machine-tools; Laboratory-testing; Exposure-chambers; Air-pressure; Electrical-measurement; Measurement-equipment; Power-generation; Pressure-testing; Machine-operators; Arc-welding; Cutting-tools; Arc-welders; Metalworking
Contact
R. E. Miller, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 315 E. Montgomery Ave., Spokane, WA 99207
CAS No.
7440-44-0
Publication Date
20110725
Document Type
Conference/Symposia Proceedings
Email Address
rom9@cdc.gov; jnp3@cdc.gov
Fiscal Year
2011
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
NOISE-CON 2011. The 25th Conference of the Institute of Noise Control Engineering, July 25 - 27 2011, Portland, Oregon
State
WA; PA; OR
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