A COMPARISON OF PREDICTED AND EXPERIMENTAL SEAKEEPING CHARACTERISTICS FOR SHIPS WITH AND WITHOUT LARGE BOW BULBS

Comparisons are made between predicted and experimental results for head wave longitudinal ship motions for three ship hulls, one of which possesses a large bow bulb. It is shown that although linearized potential strip theory is adequate for determining motion transfer functions of conventional ship hull forms, overprediction occurs for ships which possess large bow bulbs. Caution is advised in such cases when predicting seakeeping characteristics such as wetness and keel slamming, and it is recommended that the necessary relative bow motion transfer functions be determined experimentally. Further work is required to determine nonlinearities, including viscous effects, associated with large bow bulbs. Examples are given of a current approach to the evaluation of ship wetness characteristics.

• Corporate Authors:

  Naval Ship Research and Development Center

  Ship Performance Department
  Bethesda, MD  United States  20034

  Naval Ship Engineering Center

  3700 East-West Highway
  Hyattsville, MD  United States  20782
• Authors:
  • Cox, G G
  • Gerzina, D M
• Publication Date: 1974-11

Media Info

• Pagination: 23 p.

Subject/Index Terms

• TRT Terms: Bows; Seakeeping; Ship motion; Slamming
• Old TRIS Terms: Bulbous bows; Ship response
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00084834
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SPD-591-01 Final Rpt.
• Files: TRIS
• Created Date: May 19 1975 12:00AM