滑走艇の斜航時横ポーポイジングに関する基礎的研究(第1報) : 横ポーポイジングの計測と発生メカニズム

概要

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An experimental investigation on the transverse porpoising instability of a planning craft in drifting motion at high advance speeds in calm water is carried out. Some types of transverse porpoising are observed in measuring motions in oblique towing tests under heave, pitch and roll free condition. In order to clarify the influence of hydrodynamic forces on the transverse porpoising, captive model tests in oblique towing condition are carried out. The experiments are carried out by systematically changing trim angle, drift angle, towing speed and draft. From the measured hydrodynamic forces, the restoring forces and moments of heave, roll and pitch are calculated. The results show that the coupling restoring coefficients between heave and pitch have the different sign each other(∂F_z/∂θ>0, ∂M_y/∂z<0)and the coupling restoring coefficients between heave and roll also have the different sign each other (∂F_z/∂ψ>0, ∂M_x/∂z<0)at large drift angle. The results suggest that the transverse porpoising considering in the present paper may be a self-excited phenomena in a coupling motion among roll, pitch and heave.
社団法人日本船舶海洋工学会の論文
2001-09-25