FUNDAMENTAL CHARACTERISTICS OF MANOEUVRING HYDRODYNAMIC FORCES ACTING ON A SUPER-SLENDER TWIN HULL SHIP

This report describes problems concerning the fundamental characteristics of manoeuvring hydrodynamic forces acting on a super-slender twin hull ship advancing with a steady drift angle. Interaction forces between two hulls, flow-direction behind the stern which is closely related to inflow-angle to a rudder, and forward speed effect on hydrodynamic derivatives in mono-hull condition are examined. By representing the ship by the centre-plane distributions of normal doublets and sources, the hydrodynamic forces on the twin-hull ship and each of the hulls are calculated theoretically based on the linear lifting-surface theory. It is confirmed that calculated values obtained from the linear treatment agree well with the experimental results. Furthermore, assuming that the local wave effect can be practically neglected, a simplified calculation method for predicting the wave-making effect on hydrodynamic derivatives is developed. The method gives an approximate estimation of the rate of increase of the linear derivatives due to the forward speed effect.

• Supplemental Notes:
  • J Kansai Soc Naval Arch, n 219, March 1993, p 89 [8 p, 9 ref, 1 tab, 9 fig]
• Authors:
  • Yumuro, A
• Publication Date: 1993

Language

• Japanese

Subject/Index Terms

• TRT Terms: Catamarans; Hydrodynamic pressure; Maneuverability
• Old TRIS Terms: Hydrodynamic forces; Thin ships
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00705660
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM