ON THE OSCILLATIONS OF SEMI-SUBMERSIBLE CATAMARAN HULL AT SHALLOW DRAFT
This paper is the second report on the motion of a Semi-Submersible Catamaran Hull (S.S.C.H.) in regular waves and is especially concerned with the motion of S.S.C.H. at shallow draft in head seas and beams seas. We calculate the hydrodynamic coefficients (added mass, damping coefficient etc.) by Ohkusu's method, which deals with the calculation of hydrodynamic force and moment working upon multiple cylinders with an arbitrary cross section. Then the equations of the motions of S.S.C.H. in head seas or beam seas can be formulated with the aid of the strip method. The solutions of these equations are shown to be in good agreement with the experimental results except for a part of head seas. The motions of S.S.C.H. theoretically show some unique phenomena such as sharp resonance peak in short wave periods, which are caused by coupled resonance of rolling and interactions between hydrodynamic forces working upon the caissons. Usually there are many natural periods in free oscillation of S.S.C.H. theoretically. In the model experiment, however, there appears to be only one natural period which has the smallest damping force.
West Japan Society of Naval ArchitectsKyushu University, Hakozaki C-10-1, Higashi-ku
- Takaki, M
- Arakawa, H
- Tasai, F
- Publication Date: 0
- Pagination: n.p.
- TRT Terms: Catamarans; Hydrodynamic pressure; Hydrodynamics; Oscillation; Semisubmersibles; Shallow draft ships; Ship motion; Waves
- Old TRIS Terms: Hydrodynamic forces; Oscillating bodies; Regular waves
- Subject Areas: Freight Transportation; Hydraulics and Hydrology; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00323706
- Record Type: Publication
- Source Agency: Stevens Institute of Technology
- Files: TRIS
- Created Date: May 21 1981 12:00AM