波浪中における漁具の運動-II
規則波中における球形浮子の運動
1979 年 45 巻 3 号 p. 335-339
詳細
1979 年 45 巻 3 号 p. 335-339
In this paper attention is focused on the vertical motion of a freely floating sphere under the action of incident sine wave for the purpose of applying the verified theory to the motion of surface fishing gear. To simplify the problem, the linearized equation is used to describe the motion of float. To assess its accuracy and practicality, the experiments have been done under different wave conditions using semi-submerged sphere in the wave channel. The displacements of float and water level from their equilibrium positions were recorded respectively by a 35mm continuous moving-motor-driven camera with the aid of a stroboscope at the same time. To examine the response characteristics of the float, experimental data showing the relation between the amplitude and the circular frequency were presented. The computed values obtained from the linearized equation of the motion closely coincide with experimental results at different wave conditions. Through the experimental verification, it has been found that the motion of sphere exposed to wave action is represented by the linearized equation of motion under the conditions defined in this study.
