Vibrations of probe used for the defect detection of helical heating tubes in a fast breeder reactor. Part 2. Vibration analysis and numerical simulations

Takumi Inoue, Atsuo Sueoka, Takeshi Maehara, Yutaka Nakano, Hiroyuki Kanemoto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A detection of a defect of a helical heating tube installed in the fast breeder reactor "Monju" in Japan is done by a feeding of an eddy current testing (ECT) probe with magnetic sensor into the tube. An undesirable vibration of the ECT probe always happens under a certain condition and makes the inspection difficult. Several characteristics of the vibration have been made clear by some experiments using a mock-up, but the essential factor of the vibration is still unclear. In this paper, a numerical simulation of the vibration is implemented on the assumption that the vibration is caused by Coulomb friction. An analytical model, which is obtained as a lumped mass model, is a large-scale non-linear vibration system and many computational costs are ordinarily required to carry out the simulations. The Transfer Influence Coefficient Method is applied so that the simulation is efficiently carried out. The results of simulation qualitatively agree well with the experimental results. It confirms the validity of the assumption that the vibration is caused by Coulomb friction.

Original languageEnglish
Pages (from-to)868-879
Number of pages12
JournalNuclear Engineering and Design
Volume237
Issue number8
DOIs
Publication statusPublished - Apr 1 2007

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Civil and Structural Engineering
  • Mechanical Engineering
  • Safety, Risk, Reliability and Quality

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