CALCULATION OF HYDRODYNAMIC SIDE FORCES AND YAW MOMENTS OF MERCHANT SHIPS

Hydrodynamic side forces and yaw moment coefficients of merchant ships are computed using formulas developed for submersibles, but modified for free surface wall effects. The ship is represented as a combination of a body of revolution, a distribution of fixed and movable fin areas, and propellers. Thin regions of the ship hull are treated as fins, and the remainder is treated as a body of revolution. Propellers, rudders, and skegs are treated separately in conformance with actual ship geometry. The computed coefficients for the derivatives of force and moment with respect to sideslip velocity, yaw angular velocity, and rudder angle are compared with available captive model test data for various ship forms. Little or no modifications of the basic submerged body formulas are required to obtain good correlation with the test-based values of the first derivatives and three third derivatives. Simple modifications of the submerged body formulas are required to obtain good correlation with the test-based values of other third derivatives. These calculations improve capabilties in the prediction of hydrodynamics, dynamic stability, and maneuvering characteristics of surface ships.

  • Supplemental Notes:
    • Report
  • Corporate Authors:

    Stevens Institute of Technology

    Davidson Laboratory, Castle Point Station
    Hoboken, NJ  United States  07030

    Maritime Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Strumpf, A
  • Publication Date: 1983-7

Media Info

  • Features: References;
  • Pagination: 99 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00660834
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Report/Paper Numbers: DL-R-2346
  • Contract Numbers: DTMA-91-82-20034
  • Files: TRIS, USDOT
  • Created Date: Jul 21 1994 12:00AM