不規則波の消波・造波に関する研究

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With the development of the interest of exploiting ocean sources, experiments carried out on real sea wave conditions are playing a more and more important role in ocean engineering field. When experiments are carried out, reflective waves from a tank termination or a test floating body would make experiments unreliable. In order to eliminate reflective waves, theoretical and experimental approches on wave absorb-makers have been tried over the past few years. Many of them are concerned with the characteristics of wave absorb-makers in regular waves. Practically more interest must be focused on the problem in irregular waves. A new wave absorb-maker (WAM) is developed, which is installed on a two dimensional water wave tank. The new wave absorb-maker consists of a buoy, a measurement instrument, a motor activator, a control unit and an operational unit. External force for wave absorption can be calculated in the control unit by use of velocity and displacement of the buoy. The activator drives the buoy such that force measured by the force detector installed on the buoy is a close approximation to calculated force. To absorb and make waves simultaneously, we add a wave-making signal to the signal of the external force for absorption. The optimum condition for complete absorption of regular waves is well known and is easy to realize. However, the optimum condition in irregular waves can't be realized physically, because it does not satisfy the causality. Two systems, one is called "Causal System" and the other is called "Constant Coefficient System" are proposed. Both systems are described in detail in this paper. Our research is concerned with theoretical and experimental investigations on wave absorbing and wave absorb-making performace of device.
社団法人日本船舶海洋工学会の論文
1987-12-30

不規則波の消波・造波に関する研究

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