非対称双胴船の設計法の研究 : 双胴船体の圧力分布を対称化する試みについて

概要

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It has been thought that a factor having an important influence on the performance of a catamaran hull form is an asymmetrical flow around its demi-hulls. Some attempts have been made by Pien and Lin to improve the propulsive performances by means of symmetrization of flow around demi-hulls. Nevertheless, the effect of symmetrized flow around demi-hulls on resistance has not been clearly proved yet. Since 1977, the Shipbuilding Research Association of Japan (176th Research Panel) have had a plan of the catamaran studies in which a particular attention has been paid on the design procedure of a catamaran hull form with asymmetrical demi-hulls in order to have better propulsive performances. A new design procedure is proposed in this paper, in which an asymmetry hull form is expressed by a thickness and a camber functions, and the camber can be determined by the boundary conditions of in-side and out-side hull surfaces. In performing the calculation, the authors apply the Hess-Smith calculation so that the design procedure is of wide application. The calculation results of pressure distributions over the symmetry and asymmetry demi-hulls with various hull spacing are compared with the results of model experiments. As a result of these studies, it has been shown that advanced studies including free surface effect are recommended for better design of a catamaran with asymmetrical demi-hulls.
独立行政法人海上技術安全研究所の論文
1979-07-31