Determination of Damping Coefficients of Swath Catamaran Using Thin Ship Theory.

Abstract

This report 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 dampling 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. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1975
Accession Number
ADA031293

Entities

People

  • Ki-han Kim

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • C4I
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Agreements
  • Bodies
  • Computer Programs
  • Computers
  • Coordinate Systems
  • Equations
  • Far Field
  • Frequency
  • Froude Number
  • Geometry
  • Hulls (Marine)
  • Polynomials
  • Procedures (Computers)
  • Two Dimensional

Readers

  • Marine Hydrodynamics
  • Structural Dynamics.