Self-Excited Oscillation due to the Fluid Discharge over a Flexible Weir (1st Report, Excitation Mechanism of a Sloshing Mode)

Katsumi Hisano, Shigehiko Kaneko

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The excitation mechanism of a self-excited oscillation due to the fluid discharge over a flexible weir was investigated both theoretically and experimentally. A new type of hydroelastic instability was discovered during test operations of the Super-Phenix LMFBR reactor in France. According to the recent report by Aita, this phenomenon includes two types of instability modes: one is sloshing mode which means the oscillation of a weir associated with coupled sloshing modes of both feeding and restitution fluid collectors; the other is a hydroelastic mode which means the oscillation of a weir associated with fluid-shell modes. In this report, the excitation mechanism of a sloshing mode is discussed by calculating the excitation energy brought by discharge to the fluid-structure system. The theoretical results for the range of sloshing mode instability almost agreed with the experimental data.

Original languageEnglish
Pages (from-to)541-548
Number of pages8
JournalTransactions of the Japan Society of Mechanical Engineers Series C
Issue number511
Publication statusPublished - 1989 Jan 1



  • Cylindrical Shell
  • FBR
  • Fluid Vibration
  • Theory of Vibration
  • Weir

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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