超細長双胴船型の操縦流体力に関する基礎特性について

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rights: 社団法人日本船舶海洋工学会協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf:http://ci.nii.ac.jp/naid/110003871959/This report describes some problems concerning fundamental characteristics of maneuvering hydrodynamic forces acting on a super-slender twin hull ship advancing with steady drift angle. The contents consist of three parts. Interaction forces between two hulls, flow-direction behind the stern which is closely related to inflow-angle to a rudder, and forward speed effect on hydrodynamic derivatives in mono-hull condition are examined. By representing the ship by the center-plane distributions of normal doublets and sources, the hydrodynamic forces on the twin-hull ship and each of the hulls are calculated theoretically based on the linear lifting-surface theory. It is confirmed that calculated values obtained from the linear treatment agree well with the experimental results. Furthermore, assuming that the local wave effect can be practically neglected, a simplified calculation method for predicting the wave-making effect on hydrodynamic derivatives is developed. The present method gives an approximate estimation of the rate of increase of the linear derivatives due to the forward speed effect.
1993-03-25