Method and apparatus for monitoring cracks of a rotatable body

Details Method and apparatus for monitoring cracks of a rotatable body Method and apparatus for monitoring cracks of a rotatable body

1984-12-14

1987-08-11

Birmiel, Howard A.

Measuring and testing

Vibration

Sensing apparatus

73587, 364508, G01N 2904

Patent

active

046853359

ABSTRACT:
A method and apparatus for monitoring cracks of a rotatable body by detecting cracks by measuring accoustic emission signals and evaluating the depth of cracks from the result of the comparison of assumed vibrations of the rotatable body and its measured vibrations. By this method and apparatus not only the beginning of cracking of the rotatable body, but also the progress of cracking on an online basis can be detected and monitored.

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"The Vibrational Behavior of a Rotating Shaft System Containing a Transverse Crack," Mayes et al, Conf. on Vibrations in Rotating Machinery, C168/76, Sep. 1976, I.M.E.
"Vibrational Behavior of a Turbine Rotor Containing a Transverse Crack", Grabowski, Transactions of the ASME, vol. 102, Jan. 1980, pp. 140-146.

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