Mechanisms of aerodynamic noise generation in idling woodworking machines.
The American Society of Mechanical Engineers, New York, Publication 75-DET-47, 1975 Jan; :1-16
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.
NIOSH-Grant; Noise-induced-hearing-loss; Noise-sources; Woodworking-industry; Woodworking-equipment; Machine-tools; Noise-control; Acoustical-measurements; Noise-levels; Audiometry; Design
Mechanical and Aerospace Engr North Carolina State Univ 3182 Broughton Hall Raleigh, N C 27607
Final Grant Report
The American Society of Mechanical Engineers, New York, Publication 75-DET-47
North Carolina State University Raleigh, Raleigh, North Carolina