セミサブ型長大浮体の波の散乱問題に関する考察(第2報)
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Water wave diffraction by an array of plates rigidly fixed on shallow water is analysed under the assumptions of linear long wave theory. The plates are identical and equally spaced along the array. The breadth of each plate is infinitely long. Near-resonant modes occur between adjacent plates in oblique waves at critical wavenumbers and cause large pressure acting on each plate. This paper shows the relationship between this near-resonant phenomenon and an eigenvalue problem of the water wave diffraction. The result leads out that near-resonant phenomena occur when transmitted wave amplitude takes its maximum and when reflected wave vanishes. There are resonant zones, in which near-resonant phenomena occur concentratedly in the response amplitude operator. The resonant zone is independent of the number of plates and depends on the spacing of plates, wavenumber and incidence angle. The resonant zone becomes narrow as wavenumber increases, and becomes wide as the spacing of plates increases. Each resonant zone has n - l near-resonant curves which represent the relationships between the incidence angles and the near-resonant wavenumbers, where n is the number of plates. The near-resonant curve for the largest incidence angle suggests the existence of a critical angle of near-resonance for each wavenumber in this wave diffraction problem.
- 社団法人日本船舶海洋工学会の論文
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