抄録
The paper deals with the theoretical investigations of the pitch-stabilizing performance of a high speed small craft equipped with an Anti-Pitching Tank. The pitch-stabilizing device is constructed in the fore-peak tank of the boat which behaves itself like a partially-filled sea-ducted tank. The governing equations for heave and pitch motions of the boat in regular waves are proposed in the consideration of the behavior of the anti-pitching tank on the basis of the Watanabe's theory (U-tube theory) and the Ordinary Strip Method. The governing equations are simultaneous differential equations in the strict sense of the three-degrees-of-freedom stabilizing system. A series of numerical calculations are perfromed for the high speed small craft of the 64 meters ship length equipped with the Anti-Pitching Tank sailing in regular waves. By the numerical results, it is confirmed that an Anti-Pitching Tank is a useful pitch-stabilizing device for a high speed boat.
