Mechanisms of aerodynamic noise generation in idling woodworking machines.

Details

• Personal Author:
  Bailey JR ; Brooks TF
• Description:
  A combined analytical and experimental study is made of the noise due to aerodynamic interaction of rotating cutterheads and stationary table lips in woodworking machines. This study applies to all cases of machinery where stationary surfaces are in the immediate vicinity of rotating cutterheads, such as wood planers, jointers, shapers, and molders. The dominant pure tones are determined to be produced aerodynamically by both monopole and dipole mechanisms. The contribution to the sound field of each is found to be dependent on the nearness of the rotating and stationary surfaces. General aerodynamic noise theory is used to develop the mathematical models valid for either straight or helical bladed cutterheads close to table lips of finite length. An extensive experimental program for blades parallel to the axis of rotation not only verifies but complements the theory by permitting inclusion of several important design parameters not treated in the theory. [Description provided by NIOSH]
• Subjects:
  Acoustics Hearing Loss, Noise-Induced Noise Noise, Occupational Occupational Health Safety Wood
• Keywords:
  NIOSH-Grant; Noise-induced-hearing-loss; Noise-sources; Woodworking-industry; Woodworking-equipment; Machine-tools; Noise-control; Acoustical-measurements; Noise-levels; Audiometry; Design
• Series:
  Grant Final Reports
• Publisher:
  National Institute for Occupational Safety and Health
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  New York ; North Carolina ; OSHA Region 2 ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OEP - Office of Extramural Programs
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-16
• NIOSHTIC Number:
  nn:00048854
• Citation:
  Rockville, MD: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, R01-OH-000417, 1975 Jan; :1-16
• Contact Point Address:
  Mechanical and Aerospace Engr North Carolina State Univ 3182 Broughton Hall Raleigh, N C 27607
• Federal Fiscal Year:
  1975
• NORA Priority Area:
  Disease and Injury: Hearing Loss
• Performing Organization:
  North Carolina State University Raleigh
• Peer Reviewed:
  False
• Start Date:
  19740401
• Source Full Name:
  National Institute for Occupational Safety and Health
• End Date:
  19760930
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/245988/cdc_245988_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]