Floating resonance method for precise evaluation of bearing balls

Kazushi Yamanaka, Arata Saito, Satoru Ishikawa, Hideo Cho

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Although resonant ultrasound spectroscopy is useful for testing the surface and inside of objects, the resonance properties (resonance frequency and mode amplitude ratio) are disturbed by the contact with supports and transducers. To eliminate this disturbance, we propose the floating resonance method in which the resonance property is evaluated after floating the objects, while avoiding contact to supports and transducers. Thus, using laser ultrasonics, completely noncontact resonance measurement is realized for the first time. In a preliminary application to bearing balls, we succeeded in floating an 8-mm-diameter steel bearing ball using controlled air flow and in improving the reproducibility of resonance frequency to better than 0.005%. A defect was detected by observing the difference in resonance frequencies with and without the defect, which was difficult under the supported condition.

Original languageEnglish
Pages (from-to)3498-3500
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number5 B
Publication statusPublished - 2002 May
Externally publishedYes


  • Bearing ball
  • Boundary condition
  • Floatation
  • Laser ultrasound
  • Noncontact measurement
  • Resonance

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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