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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55738
標題: | 橫傾角對滑航艇阻力與航行姿態影響之研究 Study of the Influence of Heel Angle on Resistance and Kinematics of a Planning Hull |
作者: | Jen-Hao Yeh 葉人豪 |
指導教授: | 蔡進發(Jing-Fa Tsai) |
關鍵字: | 橫傾角,傾側力矩,航行姿態,滑航艇,阻力實驗, Heel Angle,Heeling Moment,Kinematics,Planning Hull,Resistance Test, |
出版年 : | 2021 |
學位: | 碩士 |
摘要: | 本研究於臺灣大學船模實驗室分別進行正浮、橫傾2.5度、橫傾5度與橫傾10度四組之阻力實驗,以量測滑航艇橫向重心偏移的情境下之阻力與航行姿態,作為其建造設計之參考,並驗證Judge提出之升力與傾側力矩預估方法的適用範圍。 實驗結果顯示,橫傾2.5度以內的重心偏移誤差對滑航艇阻力與航行姿態影響並不顯著,當橫傾增加至10度時,動態俯仰角與下沉量皆明顯降低,流場加速產生之負壓區會引致船舶朝橫傾方向持續傾斜。升力與傾側力矩預測結果顯示,橫傾5度內預測結果與量測之運動表現一致,而橫傾增加至10度時,預測結果與滑航艇實際運動表現不符。分析結果顯示,當橫傾角造成船舶其中一舷之有效橫斜角低於12度,升力與傾側力矩經驗公式不適用。 The purpose of the study is to investigate the resistance and the kinematic of a planning hull with heel angle. Another aim is to find out the criterion of empirical formula proposed by Judge. Finally, a series of resistance test were conducted, included a zero heel angle test and three non-zero heel angle tests. The lifting force and heeling moment were calculated from the measured data using empirical formula. The test results show that the change of the performance and kinematic at initial heel angle under 2.5 degree are non-significant. The trim angle and the sinkage are decreased when the initial heel angle is increased to 10 degree. The flow is accelerated as it travels at the downward side of the hull and develops a negative pressure area which causes the hull tilted to the downward side. The lifting force and heeling moment prediction results agree with the kinematic performance measured in experiments when the initial heel angle is smaller than 5 degree. However, the prediction cannot match the kinematic performance when the initial heel angle is increased to 10 degree. Therefore, the empirical formula is not applicable to the effective deadrise angle of the hull which is smaller than 12 degree. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55738 |
DOI: | 10.6342/NTU202100810 |
全文授權: | 有償授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
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U0001-3003202116411500.pdf 目前未授權公開取用 | 3.34 MB | Adobe PDF |
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