Measuring and testing – Vibration – By mechanical waves
Patent
1978-10-23
1980-04-08
Yasich, Daniel M.
Measuring and testing
Vibration
By mechanical waves
73462, 73661, 324175, G01N 2132, G01M 116
Patent
active
041966295
ABSTRACT:
This system monitors the operation of ball bearings in rotating machinery by continuously measuring the radial deflections of the outer race of these bearings using a fiber optic proximity probe. A second sensor is used to measure the rate of rotation of the machine's shaft. One of the frequency components in the signal produced by the proximity probe will be equal to the rate at which the balls in the bearing pass by the probe. The ratio of this ball pass frequency to the rotation frequency from the second probe is computed. The ratio of the peak value to the RMS value of the higher frequency noise components from the proximity probe signal is also computed. These two ratios are used to predict oncoming bearing failures and to determine if bearings have been properly installed. The component of the proximity probe output which is at the frequency of rotation of the rotor may be filtered and its phase angle may be measured to determine the angular placement of any unbalanced weight on the rotor.
REFERENCES:
patent: 2983556 (1961-05-01), Coan
patent: 3273447 (1966-09-01), Frank
patent: 3327584 (1967-06-01), Kissinger
patent: 3913084 (1975-10-01), Bollinger et al.
patent: 3926053 (1975-12-01), Schurrer et al.
patent: 3932746 (1976-01-01), Swanson
patent: 4046017 (1977-09-01), Hill
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Publication: "Detection, Diagnosis and Prognosis", Dec. 1975, NBS Special Publication No. 436-G. J. Philips, pp. 18-28.
Publication: "Optical Displacement Measuring Device" by Hamrick et al., IBM Technical Disclosure Bulletin (p. 85), vol. 5, No. 7, 12/61.
Hodges Q. E.
Sciascia R. S.
Yasich Daniel M.
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