Acoustical defect detection system

Details Acoustical defect detection system Acoustical defect detection system

1982-03-22

1984-02-07

Birmiel, Howard A.

Measuring and testing

Vibration

Sensing apparatus

73660, 340680, 340683, G01H 100, G01M 700, G01N 2904

Patent

active

044295782

ABSTRACT:
The vibration of a moving device which has repetitive movements, for instance a rotary compressor, are sensed at the outer case and analyzed in real time in both the time and frequency plane. For the time analysis the envelope of the signal is generated; for the frequency analysis a fast Fourier transform is performed and separate power spectra for fractions of a revolution are produced. The signatures are compared with those of an acceptable device to identify rejects and abnormalities at a particular position of a moving part.

REFERENCES:
patent: 3677072 (1972-07-01), Weichbrodt et al.
patent: 3705516 (1972-12-01), Reis
patent: 3712130 (1973-01-01), Weichbrodt et al.
patent: 3913084 (1975-10-01), Bollinger et al.
patent: 4213346 (1980-07-01), Polovnikov et al.
patent: 4335600 (1982-06-01), Wu et al.
patent: 4352293 (1982-10-01), Kurihara et al.
Electronics, vol. 45, No. 23, Nov. 6, 1972, p. 33.

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