水中翼を有する高速双胴船の波浪中運動に関する研究 (第1報)

DOI NDLデジタルコレクション Web Site 被引用文献2件
  • 清水 健
    正員 三井造船 (株) 船舶・海洋事業部技術開発部
  • 高品 純志
    正員 (株) 三井造船昭島研究所制御エンジニアリング事業部
  • 増山 和雄
    正員 三井造船 (株) 船舶・海洋事業部技術開発部

書誌事項

タイトル別名
  • A Study on the Motions in Waves of High-speed Catamarans with Hydrofoils (1st Report)
  • スイチュウヨク オ ユウスル コウソク ソウドウセン ノ ハロウチュウ ウンド

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抄録

The motions in waves of high-speed catamarans with hydrofoils were studied through both nonlinear computer simulation and towing tank tests. The category of the ships of our interests is characterized by a set of fully submerged hydrofoils whose dynamic lift support the majority of the ship weight and a set of catamaran hulls whose displacement gives the support for the rest of the ship weight as well as the longitudinal and lateral stability. We describe the longitudinal motions in head and following waves in this first report. The time-domain non-linear computer simulation was based on the strip method for the forces and moments on the hulls. For the dynamic lift of the hydrofoils, the unsteady components stemming from the wave orbital velocity and the ship motions were considered in the quasi-steady way. The simulation results showed good agreements with the towing tank tests in general. Through the simulation runs and the tank tests for the ship Froude number of 1.0 and the wave length to ship length ratios from 1.0 to 4.0, the motions in following waves were found to be significantly larger than those in head waves. In the high following waves (Hw/L=0.06), the fore hydrofoil went out of the water in the downward slopes of the waves and the ship showed large non-linear motions. This kind of wild motions in following waves are described to be a natural tendency of the ships of the subject category. In order to suppress the large motions, we tried controlling the angle of attack of the hydrofoils by feeding the pitch angle and the pitch rate back. Both the simulation and the tank tests showed significant effects of the control. The amplitudes of the pitching motions were reduced to about 30% of those under no control both in head waves and in following waves. Finally, we studied the effects of the hydrofoil configuration with the simulation. Although the studied cases dis not show good improvements of the wild motions in following waves, the developed simulation program in a good tool for designing this kind of ships considering the motions in waves. In the second report, we intend to survey the motions of six degrees of freedom in the waves from various directions.

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