Accession Number:

ADA031293

Title:

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

Descriptive Note:

Final rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF OCEAN ENGINEERING

Personal Author(s):

Report Date:

1975-01-01

Pagination or Media Count:

70.0

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 Lees 1974 experiments. The results show that damping is greatly affected by the Brard parameter, omegaVg, 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

Subject Categories:

  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE