Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1994-10-11
1996-11-05
Noland, Thomas P.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73630, 73582, 73649, 364508, G01N 2900, G01N 2912
Patent
active
055719660
ABSTRACT:
A nondestructive inspection method predicts the lifetime of a measured object. A measured object is made to vibrate, and there is obtained a frequency difference .increment.f between a frequency of a nth-order spectrum and a frequency of a (n+1)th-order spectrum of any one of longitudinal waves, transverse waves and distortional waves generated in the measured object when the measured object is made to vibrate. It is possible to predict lifetime of the measured object by detecting degree of deterioration of the measured object based on a relational curve representing the frequency difference .increment.f and the circumstances of use of the measured object.
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Iwatsu Electric Co. Ltd.
Kwok Helen C.
Noland Thomas P.
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