Arrangement for minimizing buzz saw noise in bladed rotors

Details Arrangement for minimizing buzz saw noise in bladed rotors Arrangement for minimizing buzz saw noise in bladed rotors

1982-11-12

1988-03-22

Scott, Samuel

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

416223R, 416500, F04D 2966

Patent

active

047325321

ABSTRACT:
The invention minimizes selected tones present in buzz-saw noise, otherwise known as multiple pure tone noise. This noise arises from the production of unequal shockwaves during the rotation at sonic or supersonic velocities of a bladed rotor, the dimensional characteristics of whose blades are subject to manufacturing tolerances. Minimization of selected buzz-saw noise tones is achieved by arranging the blades around the rotor in a sequence which minimizes selected Fourier coefficients of the shockwave strengths; alternatively, the blades are arranged to minimize selected Fourier coefficients of the dimensional characteristics of the blades, such as thickness, t, stagger angle .theta., and camber. The invention is particularly applicable to the fan propulsors of turbofan aeroengines.

REFERENCES:
patent: 3006603 (1961-10-01), Caruso et al.
patent: 3058528 (1962-10-01), Hiersch
patent: 3169694 (1965-02-01), Borchers
patent: 3270953 (1966-09-01), Jerie et al.
patent: 3465524 (1969-09-01), Wilde et al.
patent: 3531167 (1970-09-01), Edge et al.
patent: 3536417 (1970-10-01), Stiefel et al.
patent: 3820918 (1974-06-01), Goldstein
patent: 3888601 (1975-06-01), Glassburn
patent: 4213736 (1980-07-01), Gongwer
patent: 4253800 (1981-03-01), Segawa
SAE Journal, Jan. 1962, pp. 54-60, "Stop Compressor Noise Before It Starts", based on a paper by Tyler & Sofrin (Pratt & Whitney Aircraft).
J. M. Diehl, "Think Quiet" from Compressed Air, copyright 1971.
M. L. Adams, "Keep Rotor Vibration under Control" from Power, Aug. 1978, pp. 28, 29 & 65.
"Multiple Pure Tone Noise Generated by Fans at Supersonic Tip Speeds"-Sofrin and Pickett.
"Air Transport-British Upgrade Mideast Service", Aviation Week & Space Technology, May 21, 1979, pp. 24-27.

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