Method for determining rotational speed from machine vibration d

Details Method for determining rotational speed from machine vibration d Method for determining rotational speed from machine vibration d

1996-05-10

1998-04-28

Oda, Christine K.

Measuring and testing

Vibration

Sensing apparatus

73659, 364508, G01N 2900

Patent

active

057447233

ABSTRACT:
A method of determining the rotational speed of a rotating shaft from machine vibration data. The vibration produced by the shaft is sensed to produce a test vibration signal at an unknown rotational speed of the shaft, which test vibrational signal is converted to a test frequency spectrum. A reference frequency spectrum, corresponding to a known rotational speed of the shaft, is provided, and a stretch factor is determined. The stretch factor provides optimum correlation between the test frequency spectrum and the reference frequency spectrum. The unknown speed of the rotating shaft is calculated using the known speed of the reference frequency spectrum and the stretch factor.

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