Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1992-05-08
1994-10-18
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73602, G01H 1300
Patent
active
053557310
ABSTRACT:
A method is provided for grading production quantities of spherical objects, such as roller balls for bearings. A resonant ultrasound spectrum (RUS) is generated for each spherical object and a set of degenerate sphere-resonance frequencies is identified. From the degenerate sphere-resonance frequencies and known relationships between degenerate sphere-resonance frequencies and Poisson's ratio, a Poisson's ratio can be determined, along with a "best" spherical diameter, to form spherical parameters for the sphere. From the RUS, fine-structure resonant frequency spectra are identified for each degenerate sphere-resonance frequency previously selected. From each fine-structure spectrum and associated sphere parameter values an asphericity value is determined. The asphericity value can then be compared with predetermined values to provide a measure for accepting or rejecting the sphere.
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Dixon Raymond D.
Migliori Albert
Visscher William M.
Finley Rose M.
The Regents of the University of California, Office of Technolog
Williams Hezron E.
Wilson Ray G.
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