9. On the Hydrodynamic Forces Acting on Box-Type Vessels and Their Motions

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It seems that a standard calculation method of motions for box-type vessels, equivalent to Ordinary Strip Method for ships, has not been definitely established yet. In this paper, a practical method is presented for estimating their motions in waves with a high accuracy. The authors have carried out forced oscillation tests, measurements of wave exciting force, and motion tests in beam, head and oblique seas by use of box-type vessels of small length-to-beam ratio (L/B) which is supposed to have 3-dimensional effect, and made 2-dimensional and 3-dimensional theoretical calculations. The 3-dimensional calculation gives accurate values of almost all hydrodynamic coefficients and wave exciting forces excluding damping term of rolling, etc., but it has a disadvantage that CPU time is long. Therefore, as a practical calculation method of the motion, the authors have developed a Modified Strip Method (M.S.M.) on the basis of the strip method of short CPU time, taking account of experimental results and 3-dimensional calculation results. The M.S.M. is as follows: 1) Longitudinal strip method is adopted as well as ordinary transverse strip method. 2) Strict Strip Method (or Salvesen-Tuck-Faltinsen Method) is introduced for estimating wave exciting force. 3) Correction of 3-dimensional effect is made, based on experimental results and 3-dimensional calculation results. 4) Estimation method of eddy damping for roll is modified, taking 3-dimensional effect and shallow water effect into consideration.
社団法人日本船舶海洋工学会の論文

9. On the Hydrodynamic Forces Acting on Box-Type Vessels and Their Motions

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