내부가 빈 원기둥의 수직운동 특성
Characteristics of Heaving Motion of Hollow Circular Cylinder
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초록
In the present investigation, the hydrodynamic characteristics of a vertically floating hollow cylinder in regular waves have beenstudied. The potential theory for solving the diffraction and radiation problem was employed by assuming that the heave response motion waslinear. By using the matched eigenfunction expansion method, the characteristics of the exciting forces, hydrodynamic coefficients, and heave motionresponses were investigated with various system parameters such as the radius and draft of a hollow cylinder. In the present analytical model, tworesonances are identified: the system resonance of a hollow cylinder and the piston‐mode resonance in the confined inner fluid region. The pistonresonance mode is especially important in the motion response of a hollow circular cylinder. In many cases, the heave response at the pistonresonance mode is large, and its resonant frequency can be predicted using the empirical formula of Fukuda (1977). The present design tool can beapplied to analyze the motion response of a spar offshore structure with a moon pool.
Abstract
In the present investigation, the hydrodynamic characteristics of a vertically floating hollow cylinder in regular waves have beenstudied. The potential theory for solving the diffraction and radiation problem was employed by assuming that the heave response motion waslinear. By using the matched eigenfunction expansion method, the characteristics of the exciting forces, hydrodynamic coefficients, and heave motionresponses were investigated with various system parameters such as the radius and draft of a hollow cylinder. In the present analytical model, tworesonances are identified: the system resonance of a hollow cylinder and the piston‐mode resonance in the confined inner fluid region. The pistonresonance mode is especially important in the motion response of a hollow circular cylinder. In many cases, the heave response at the pistonresonance mode is large, and its resonant frequency can be predicted using the empirical formula of Fukuda (1977). The present design tool can beapplied to analyze the motion response of a spar offshore structure with a moon pool.
참고문헌 (12)
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