The optimum ship hull of a minimum wave bulbous ship with parallel mid-body is studied. The bulb is represented by a point doublet, and the ship body is expressed by a Michells source distribution with an even power polynomial. To obtain the wave resistance, the well-known Havelocks formula is used. The method of Lagrangian multipliers is then employed to solve the variational problem with minimum wave resistance and other side conditions about the ship shape. Numerical calculations are carried out for several Froude numbers. Shoulder wave resistance is included in the calculation. The bow shoulder interference is neglected. The shoulder wave resistance due to the optimum bulbous ship is much smaller than not only its bow wave resistance but also either the bow or shoulder wave resistance due to the optimim non-bulbous ship. Plots of optimum ship waterline, bulb size, and minimum wave resistance at different Froude numbers are presented. ( Author )

  • Corporate Authors:

    Hydronautics, Incorporated

    7210 Pindel School Road
    Laurel, MD  United States  20810
  • Authors:
    • Yim, B
    • Shih, H H
  • Publication Date: 1967-9

Media Info

  • Pagination: 34 p.

Subject/Index Terms

  • TRT Terms: Bows
  • Old TRIS Terms: Bulbous bows
  • Subject Areas: Design; Marine Transportation;

Filing Info

  • Accession Number: 00001893
  • Record Type: Publication
  • Source Agency: Defense Documentation Center
  • Report/Paper Numbers: TR-117-9 Tech Rpt.
  • Contract Numbers: NONR334900
  • Files: TRIS
  • Created Date: Oct 30 1972 12:00AM