箱型没水体に働く流体力について : その1.強制動揺試験

概要

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Recently with the appearance of various floating offshore structures and semisubmersible working barges, studies to improve their seaworthiness are stimulated. To estimate the behavior of these floating structures we have to investigate the hydrodynamic forces of their individual parts such as lower-hulls, columns, blacings etc. of which they consist. In this paper, the author treats the problems of hydrodynamic forces acting on submerged hexahedrons as a typical form of lower-hulls. Forced oscillation tests for heave, sway, and roll modes were carried out for six models with variable length breadth ratio and breadth thickness ratio to obtain added mass and damping coefficients. For one of models, same tests were carried out with variant submergence. These coefficients were compaired with the values evaluated by Ijima's method which is one of two-dimensional linear potential theories. It is found that in the case of small submergence the theoretical values deviate from the experimental results due to the nonlinerity of the flow field. This discrepancy becomes smaller at deeper submergence. In the range of large length breadth ratio the theoretical values can explain the experimental results considerably well.
独立行政法人海上技術安全研究所の論文
1980-03-31