Noise Control of Hand-Held Power Tools

Details

• Personal Author:
  Mongeau L ; Suh S
• Description:
  The noise control solutions for commonly used hand-held tools were identified and implemented. The implementation of the torsional vibration damper yielded a considerable reduction in vibrations at 30 Hz with an impact wrench. However, no significant reduction in the overall sound power level occurred, due to the fact that large changes in level at low frequencies do not translate to large changes in overall sound power level when using the A weighted scale. To achieve an overall reduction in sound power levels, it is recommended that a frequency in the range of 1 kHz - 2 kHz be targeted for the torsional vibration damper. This design would be more likely to reduce noise in bands which contribute most to loudness as perceived by the human ear, which was the primary goal of this study. A higher tuned resonance frequency could be achieved by decreasing the outer radius of the steel ring, decreasing the thickness of the spring, decreasing the density of the steel, or selecting a spring material with a higher shear modulus. Noise control solution utilizing acoustic foam for the jigsaw resulted in the decrease of overall sound pressure level by a 1.5 dB in an idle condition and 2.4 dB when cutting. An attenuation of 1.9 and 2.5 dB of sound power were achieved, respectively. The goal of attenuating the noise under 6kHz was achieved. With further work on the solution design and more professional tools, this solution has the ability to produced greater attenuation of the noise. [Description provided by NIOSH]
• Subjects:
  Engineering Hearing Loss Hearing Loss, Noise-Induced Noise Noise, Occupational Occupational Health Safety Vibration
• Keywords:
  Control-technology Engineering-controls Hearing-loss Noise-exposure Noise-induced-hearing-loss Noise-levels Noise-measurement Noise-transmission Vibration-control Vibration-effects Vibration-exposure Vibration-suppressors

  More +
• Series:
  Mining Publications
• Publisher:
  Institute of Noise Control Engineering of the USA
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-9
• NIOSHTIC Number:
  nn:20033780
• Citation:
  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; :1-9
• Contact Point Address:
  NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• Editor(s):
  Holger DK; Maling GC Jr.
• Federal Fiscal Year:
  2003
• Peer Reviewed:
  False
• Source Full Name:
  NOISE-CON 2003: Proceedings of the 2003 National Conference on Noise Control Engineering, Cleveland, Ohio, June 23-25, 2003
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:78e67eac13111726485c0f5d96044840fb67d82494d611d422577dab209469e75f15d4276ed6b1461fc4a255fd063dc14a0f5d5c5a65107083cd8f9c88e62f63
• Download URL:
  https://stacks.cdc.gov/view/cdc/226958/cdc_226958_DS1.pdf
• File Type:
  [PDF - 378.80 KB ]