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Title: Sphericity determination using resonant ultrasound spectroscopy

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
Assignee:
Univ. of California, Office of Technology Transfer, Alameda, CA (United States) PTO; EDB-94-168673
Patent Number(s):
US 5355731; A
Application Number:
PPN: US 7-880393
Contract Number:
W-7405-ENG-36
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