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Mechanisms of aerodynamic noise generation in idling woodworking machines.

Authors
Brooks-TF; Bailey-JR
Source
The American Society of Mechanical Engineers, New York, Publication 75-DET-47, 1975 Jan; :1-16
Link
NIOSHTIC No.
00048854
Abstract
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.
Keywords
NIOSH-Grant; Noise-induced-hearing-loss; Noise-sources; Woodworking-industry; Woodworking-equipment; Machine-tools; Noise-control; Acoustical-measurements; Noise-levels; Audiometry; Design
Contact
Mechanical and Aerospace Engr North Carolina State Univ 3182 Broughton Hall Raleigh, N C 27607
Publication Date
19750101
Document Type
Final Grant Report
Funding Amount
104385
Funding Type
Grant
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00417
NIOSH Division
OEP
Priority Area
Noise-induced-hearing-loss
Source Name
The American Society of Mechanical Engineers, New York, Publication 75-DET-47
State
NY; NC
Performing Organization
North Carolina State University Raleigh, Raleigh, North Carolina
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