Method and apparatus for detecting defects in an object by vibra

Details Method and apparatus for detecting defects in an object by vibra Method and apparatus for detecting defects in an object by vibra

1991-04-03

1993-06-01

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73646, 364508, G01N 2912

Patent

active

052149609

ABSTRACT:
A test object such as an engine cylinder is inspected for any defect such as a crack, a blowhole, a cavity, or the like by applying vibration to the test object at two different positions on a side thereof. While the test object is vibrating, signals indicative of the vibration of the test object are detected. From the detected signals, there are produced a signal indicative of a natural vibration of the test object and a signal indicative of a defect-induced vibration of the test object. The signal indicative of a natural vibration and the signal indicative of a defect-induced vibration are compared to determine whether there is a defect in the test object.

REFERENCES:
patent: 3916699 (1975-11-01), Moran et al.
patent: 4519245 (1985-05-01), Evans
patent: 4829823 (1989-05-01), Michel

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