頁籤選單縮合
題名 | 滑航艇縱向不穩定性之研究=On the Longitudinal Dynamic Instability of Planing Hulls |
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作者 | 汪群從; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 16:1 1997.02[民86.02] |
頁次 | 頁61-67 |
分類號 | 444.73 |
關鍵詞 | 滑航艇; 運動; 躍水; 不穩定; Planing hull; Motion; Porpoisin; Instability; |
語文 | 中文(Chinese) |
中文摘要 | 將Schnitzer引介之附加質量涵蓋於非線性運動方程式中,並考慮浮力校正係數的影響,本文介紹方法可用以模擬滑航艇在靜水中高速運動時之躍水不穩定現象以及在波浪中高速運動時艇模脫離水面之不穩定現象。滑航艇在靜水中高速滑航產生躍水不穩定現象時,在不同的荷重係數下,臨界俯仰角與荷重速度係數成一定的關係,荷重速度係數與重心位置的比值則與體積福祿數成指數變化關係。非線性運動方程式模擬值與Day & Haay以及DTMB Series 62實驗值相符。滑航艇在靜水中高速滑航,其狀態接近躍水不穩定產生區域時。在波浪中以同樣高速迎浪運動時,波高不大時在波浪中呈穩定滑航,當波高繼續增加時,滑航艇會脫離水面,呈不穩定狀態。 |
英文摘要 | Added mass introduced by Schnitzer and buoyancy correction factor are incorporated in a nonlinear model to study porpoising inception problems of prismatic planing hulls. For given loading conditions, at the inception of porpoising, the trim angle is related to the boat lift coefficient, while the ratio of boat lift coefficient to the distance from transom to the center of gravity is related to the volumetric Froude number. Computed results compared nicely with test data reported by Day & Haag and DTMB. For high speed planing boats running at conditions close to the inception of porpoising, the boat may leave water and become unstable when it runs in waves with significant wave height at the same planing speed. |
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