Relative resonant frequency shifts to detect cracks

Details Relative resonant frequency shifts to detect cracks Relative resonant frequency shifts to detect cracks

1993-11-30

1995-06-20

Williams, Hezrone E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73646, G01H 1300, G01N 2912

Patent

active

054252725

ABSTRACT:
An ultrasonic measurement method for distinguishing between unflawed and flawed parts comprises the steps of detecting at least two prominent resonant response frequencies, measuring the frequency difference between the two frequencies, determining the ratio of the frequency difference to one of said frequencies, and comparing the ratio to a predetermined part criterion. Resonant response frequencies dependant upon physical characteristics such as dimensions and weight are compared to other resonances which are at frequencies dependant upon stiffness of the part.

REFERENCES:
patent: 4283952 (1981-08-01), Newman
patent: 4829823 (1989-05-01), Michel
patent: 5062296 (1991-11-01), Migliori
patent: 5257544 (1993-11-01), Khuri-Yakub et al.
patent: 5285687 (1994-02-01), Ringel et al.

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