- 作者: 方銘川; 李銘霖; 余盛富
- 作者服務機構: 成功大學造船及船舶機械工程研究所; 高雄海事專科學校造船科
- 中文摘要: 本文係以截片理論為基礎,分析雙體船在規則波中運動時,其橫甲板所承受的波浪荷重。由於雙體船的波浪荷重與其運動及作用在各截面的流體動力有密切關係,本文首先說明船體運動的數學模式以及流體動力的求法,其中流體動力尚需考慮兩船殼間的交互影響。利用切取自由體的觀念,將上述所有作用在船殼上的波浪力、流體動力及船體的慣性力,在雙體船的橫甲板跨距中央處,求其合力及合力矩,此即波浪荷重。目前最常用的方法有一般方法及簡化法,本文綜合以上兩種方法再提出另一種改進的計算方法。即將簡化的方法加入前述一般法所考慮的實際船型在不同截面的形狀以及縱搖與平擺運動對波浪荷重的影響而發展出的一種混合法。 本文以ASR雙體船為數值計算模型,以自行開發之一般法及混合法的電算程式來進行其波浪荷重計算,並將所得數值與現有文獻之實驗數據及簡化法的計算結果相比對,可明顯看出混合法的計算值較另二法所得值更接近實驗結果,而且更有效率。因此可提供雙體船波浪荷重分析一項有力的計算工具。
- 英文摘要: Based on the strip theory, we propose a hybrid method to accurately predict the sea loads of acatamaran ship advancing in waves. Because the ship motion and sectional hydrodynamic coefficientsare the primary factors affecting the sea loads, their corresponding mathematical models are derived,including the hydrodynainic interactions. With the corresponding forces on the ship hull, the sea loadson the mid-point of the cross deck can be obtained by using the free-free beam concept. Either a standardapproach or a simplified approach normally solves such kinds of sea loads. However, instead of employingthose approaches, we propose another method called hybrid approach. Such approach not only considersthe different section shapes, but also includes the effects of pitch and yaw motions. Results obtainedby hybrid method are preferable to those from the other approaches. Therefore, the hybrid approachproposed here can be considered as a highly effective tool in analyzing the sea loads for a catamaranship in waves.
- 中文關鍵字: sea loads, hydrodynamic; strip theory
- 英文關鍵字: --