DETERMINATION OF DAMPING COEFFICIENTS OF SWATH CATAMARAN USING THIN SHIP THEORY

This thesis deals with the problem of pitch and heave damping of a catamaran with small-waterplane-area-twin-hull (SWATH) configuration. A computer program has been developed to compute the pitch and heave damping coefficients of SWATH including forward speed effects based on the thin ship theory developed by Newman (1959). Calculations of the damping coefficients for several Froude numbers are compared with Lee's (1974) experiments. The results show that damping is greatly affected by the Brard parameter, omega V/g when the forward speed effects are considered. The effect of hull distance variation on damping is also considered. The results show that damping is an oscillatory function of hull distance. The oscillatory phenomenon dies out as the hull distance increases, and also as the Brard parameter increases.

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Kim, Karl
• Publication Date: 1975-1-10

Subject/Index Terms

• TRT Terms: Catamarans; Hydrodynamics; SWATH ships
• Uncontrolled Terms: Ship design
• Subject Areas: Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00099981
• Record Type: Publication
• Source Agency: Massachusetts Institute of Technology
• Report/Paper Numbers: MS Thesis
• Files: TRIS
• Created Date: Oct 18 1975 12:00AM