EXPERIMENTAL STUDIES ON THE HYDRODYNAMIC FORCES ACTING UPON FULL-BODIED SHIPS WITH RELATION TO THEIR COURSE STABILITY

Model experiments are useful for predicting course stability, but some models of full-bodied ships, such as large tankers, have unusually good course-stability which may or may not correspond to full-scale behaviour. A further difficulty is that models often display a "fickle" course-behaviour. The Authors discuss this phenomenon of unusually-good course stability in the model, and describe a study of its possible causes. The hydrodynamic forces involved were measured for two typical 4.5-m models, one unstable and the other unusually stable, with the same main dimensions. The hydrodynamic derivatives obtained from these measured forces are compatible with the course stability observed in freesailing model tests; there are differences between the derivatives of the two models, and they may be due to differences between the respective after frame-lines and stern profiles. A difference is also observed in respect of after-body force, but not of rudder force. Propeller rpm has a significant effect on the hydrodynamic forces at the after-body, and seems to have an important role in the phenomenon of unususal course-stability. Order from: BSRA as No. 48,566.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03899101
• Corporate Authors:

  Kansai Zosen Kyokai, Osaka University

  Aza-yamadaue, Suitashi
  Osaka,   Japan 
• Authors:
  • Kashiwadani, Y
  • Kitaguchi, S
  • Yasuoka, H
• Publication Date: 1977-12

Language

• Japanese

Media Info

• Features: References;
• Pagination: 10 p.
• Serial:
  • Journal of the Kansai Society of Naval Architects
  • Issue Number: 167
  • ISSN: 0389-9101

Subject/Index Terms

• TRT Terms: Full bodied ships; Hydrodynamic pressure; Stability (Mechanics)
• Old TRIS Terms: Course stability; Hydrodynamic forces; Model testing; Stability derivatives
• Subject Areas: Education and Training; Marine Transportation; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00179541
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: Aug 27 1978 12:00AM