Shaft vibration evaluation

Details Shaft vibration evaluation Shaft vibration evaluation

1983-05-09

1984-08-14

Birmiel, Howard A.

Measuring and testing

Vibration

Sensing apparatus

73462, 340682, 340683, G01M 122

Patent

active

044649355

ABSTRACT:
A shaft vibration evaluator employs measured displacement of a shaft in the vicinity of a bearing together with known or measured shaft eccentricity to calculate the dynamic bearing load so that damaging loads can be avoided. Shaft vibration or motion is assumed to be elliptical having major and minor axes which are inclined at angles with respect to the bearing displacement sensors. The magnitude of the major and minor axes and the angular displacement are calculated from the measured parameters and provide one set of inputs to the load calculator. Bearing eccentricity can be calculated from a knowledge of shaft speed, lubricant temperature and known bearing geometry. For a given eccentricity, a set of four damping coefficients and four spring coefficients of the bearing may be derived. These coefficients are the remaining inputs to the dynamic load calculator.

REFERENCES:
patent: 3686956 (1972-08-01), Simpkin et al.
patent: 4213346 (1980-07-01), Polovnikov et al.
patent: 4423665 (1984-01-01), Senicourt et al.

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