VORTEX-INDUCED HEAVY VIBRATIONS IN ENCLOSED HULL CAVITIES

Heavy vibrations around the sea chests--enclosed hull cavities arranged for taking the sea water inboard--of high-speed ships were investigated by full-scale measurements, and by model experiments in a cavitation tunnel and on an oscillating table. Both methods indicated the mechanism of vibration to be one of vortex-induced vibrations called "cavity resonance" or "cavity oscillation" and the mechanism was reexamined on a scale model. With data from the ship and the cavitation tunnel experiment, an empirical formula was derived in terms of Strouhal number for estimating the vortex generation frequency. Another formula was derived for estimating the natural frequency of the sea-chest/enclosed-fluid system, applying the energy method. Measures for abating the sea chest vibration were devised and their effectiveness was demonstrated by model experiment.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03060209
• Supplemental Notes:
  • Journal article; Also published in Transactions of the Royal Institution of Naval Architects, 1988
• Authors:
  • Okamura, N
  • Sasajima, H
  • Tanida, K
• Publication Date: 1988-6

Media Info

• Features: References;
• Pagination: 16p., incl. discuss.
• Serial:
  • Naval Architect
  • ISSN: 0306-0209

Subject/Index Terms

• TRT Terms: Hulls; Vibration; Vortices
• Uncontrolled Terms: Cavities
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00655457
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM