Method and apparatus for detecting defects and different-hardnes

Details Method and apparatus for detecting defects and different-hardnes Method and apparatus for detecting defects and different-hardnes

1991-04-03

1993-06-08

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73646, 364508, G01N 2912

Patent

active

052169219

ABSTRACT:
A test object having a plurality of protrusions is inspected for a defect and/or different-hardness by applying vibration to the test object. Spectral data of the vibration of the test object is analyzed based on signals indicative of the vibration of the protrusions. Spectral energy peaks are then detected in different spectral frequency regions corresponding respectively to the protrusions based on the signals. It is then determined whether there are two separate spectral energy peaks in the spectral region corresponding to each of the protrusions, thereby to determining whether there is a defect and/or different-hardness portion in each of the protrusions.

REFERENCES:
patent: 2486984 (1949-11-01), Rowe
patent: 3916699 (1975-11-01), Moran et al.
patent: 4805457 (1989-02-01), Oates et al.
patent: 5062296 (1991-11-01), Migliori
"Development of an Improved Sonic Resonance Inspection System for Nodularity in Crankshafts" by B. V. Kovacs, Y. Stone and E. P. Papadakis, Materials Evaluation/42/Jun. 1984, pp. 906-915.

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