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Title: Sphericity determination using resonant ultrasound spectroscopy

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. 14 figs.

Inventors:
; ;
Issue Date:
OSTI Identifier:
7173812
Patent Number(s):
5355731 A
Application Number:
PPN: US 7-880393
Assignee:
Univ. of California, Office of Technology Transfer, Alameda, CA (United States)
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 8 May 1992
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BALL BEARINGS; MACHINE PARTS; SPHERICAL CONFIGURATION; ULTRASONIC TESTING; ROLLER BEARINGS; CALIBRATION; FREQUENCY DEPENDENCE; ACOUSTIC TESTING; BEARINGS; CONFIGURATION; MATERIALS TESTING; NONDESTRUCTIVE TESTING; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Dixon, R D, Migliori, A, and Visscher, W M. Sphericity determination using resonant ultrasound spectroscopy. United States: N. p., 1994. Web.
Dixon, R D, Migliori, A, & Visscher, W M. Sphericity determination using resonant ultrasound spectroscopy. United States.
Dixon, R D, Migliori, A, and Visscher, W M. Tue . "Sphericity determination using resonant ultrasound spectroscopy". United States.
@article{osti_7173812,
title = {Sphericity determination using resonant ultrasound spectroscopy},
author = {Dixon, R D and Migliori, A and Visscher, W M},
abstractNote = {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. 14 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {10}
}