Angle-Dependent Effects for Impulsive Noise Reduction for Hearing Protectors

Details

• Personal Author:
  Adams D ; Graydon PS ; Murphy, William J.
• Description:
  The exposure at the ear in response to a forward-propagating wave depends upon the angle of incidence at the head, the nominal sound pressure level of the impulse and the attenuation of hearing protection (if worn). The unoccluded and occluded responses of an acoustic test fixture equipped with two G.R.A.S. IEC 60711 couplers 1=4-inch microphones were measured in 15 degrees increments for impulses with nominal peak sound pressure levels of 150 and 160 decibels. The attenuation was assessed in a variety of ways: Impulse Peak Insertion Loss (IPIL), change in A-weighted Equivalent Energy, and change in the Auditory Hazard Unit. Generally, the LAeq was quite similar to the (IPIL). However the change in AHUs predicted less attenuation than was actually observed. The lower performance for AHUs may be attributable to the nonlinear hazard growth for the unoccluded ear. [Description provided by NIOSH]
• Subjects:
  Ear Hearing Noise Noise, Occupational Occupational Health Protective Clothing Safety Sense Organs
• Keywords:
  Acoustical Measurements Acoustics Auditory System Ear Protectors Exposure Assessment Hearing Protection Impulse Noise Noise Levels Noise Propagation Noise Protection Noise Waves Sound Sound Attenuation Sound Propagation Wave Propagation

  More +
• ISSN:
  1939-800X
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  29
• Issue:
  1
• NIOSHTIC Number:
  nn:20051603
• Citation:
  Proc Mtgs Acoust 2016 Nov; 29(1):040010
• Contact Point Address:
  William J. Murphy, Division of Applied Research and Technology, Hearing Loss Prevention Team, National Institute for Occupational Safety and Health, Cincinnati, OH, 45226-1998
• Email:
  wjm4@cdc.gov
• Federal Fiscal Year:
  2017
• Peer Reviewed:
  True
• Source Full Name:
  Proceedings of Meetings on Acoustics
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:15a1231b0f0c4563ea716481415a0a721c0362ad7ee8b5b87450b211900f1c4b3a90d691ba01230a3a6b1e13f8279beedd0f9dcc75f6d22eab05916a03162dd9
• Download URL:
  https://stacks.cdc.gov/view/cdc/211472/cdc_211472_DS1.pdf
• File Type:
  [PDF - 7.66 MB ]