Acoustic comparison of pneumatic and electric jackleg drills used in the mining industry.
Camargo-HE; Peterson-JS; Kovalchik-PG; Alcorn-LA
NOISE-CON 2010: Proceedings of the 2010 National Conference on Noise Control Engineering and 159th Meeting of the Acoustical Society of America, Baltimore, Maryland, April 19-21, 2010. Burroughs CB; Maling G; eds., Indianapolis, IN: Institute of Noise Control Engineering of the USA, Paper No. 3aNCc2, 2010 Apr; :1-5
Hearing loss is the most prevalent disease among miners. A study of U.S. western hard-rock mines revealed that 96% of machine operators were overexposed to noise, with jackleg drill operators having the most rapid noise dose accumulation. Traditionally, jackleg drills have been driven by pneumatic power. However, there are currently available rotary hammer drills powered by electricity. This paper presents an acoustic assessment of pneumatic and electric jackleg drills that involved noise source identification (NSID), penetration rate and operator's cumulative noise dose measurements, and determination of sound power levels. NSID using microphone phased array technology revealed two dominant noise sources for the electric drill, one located at the drill and one located at the drill steel-rock interaction place. In contrast, NSID for the pneumatic drill showed only one dominant noise source located at the drill. Penetration rate and noise dose measurements were combined to estimate the accumulated dose and time required to drill a reference depth hole. Sound power level measurements yielded overall 115 and 125 dB(A) for the electric and pneumatic drills, respectively. The results show that the acoustic performance of the electric drill, despite its slower penetration rates, overcomes the benefits of traditional pneumatic drills.
Acoustical-measurements; Acoustics; Acoustic-trauma; Acoustic-vibration; Control-technology; Exposure-assessment; Exposure-levels; Hearing; Hearing-conservation; Hearing-disorders; Hearing-impairment; Hearing-loss; Injuries; Injury-prevention; Mine-workers; Mining-industry; Miners; Noise; Noise-control; Noise-induced-hearing-loss; Safety-measures; Safety-practices; Sound; Sound-analyzers; Sound-attenuation; Statistical-analysis; Tools; Underground-miners; Underground-mining; Work-environment; Worker-health; Work-operations; Work-performance; Workplace-monitoring; Workplace-studies; Work-practices
Hugo Camargo, NIOSH/OMSHR, PO Box 18070, Pittsburgh, PA 15236
NOISE-CON 2010: Proceedings of the 2010 National Conference on Noise Control Engineering and 159th Meeting of the Acoustical Society of America, Baltimore, Maryland, April 19-21, 2010