• 作者： 劉思遠
• 作者服務機構： 中正理工學院車輛工程系
• 中文摘要： 小水面雙體船（SWATH）在海上之適應性及穩定性相對於傳統型單體船，經證明有較優異之表現，極適於在臺灣海域上擔任軍艦作戰防禦、海洋鑽探等工作，故本船型在國內之研發推廣實有其必要性。為能更充實國內現有對SWATH相關研究之成果，本計劃之目標乃針對SWATH與海浪激振交互作用下所引發之非線性波浪負荷做分析預測。本研究沿用已發展完成之三維邊界積分數值法，演算不同海況下SWATH之一階（線性）流體動力係數、波浪激盪負荷及運動係數。至於SWATH之二階（非線性）波浪負荷分析，則依據一階所計算之各係數，結合近場壓力積分法，計算各海況下SWATH在水平方向（surge, sway, yaw）與垂直方向（heave, roll, pitch）之二階波力與力矩。分析所得之高階波浪負荷對SWATH在航行時發生水平方向漂移與垂直方向產生傾斜現象之問題，提供理論上的印證。因此本研究所建立SWATH在非線性波浪負荷預估能力，可於未來設計與研製SWATH之際，對影響該型船的操控與安全性能上，提供有利之分析模式。
• 英文摘要： It is found that the SWATH ship has much better seakeeping characteristics compared with amonohull ship of equivalent displacement. The large weather-deck area, large transverse stability andopen space between the two hulls make the SWATH ship an attractive hull form for military operationsand ocean mining in the region of the Taiwan Strait. In this research, an analysis of the nonlinear waveloads on the SWATH ship is carried out. The three-dimensional boundary integral equation associatedwith free surface Green function method is used to evaluate the first order hydrodynamic coefficients,wave exciting forces and motion responses. Using the pressure integration technique of the first ordersolutions, the second order horizontal (surge, sway, yaw) and vertical (heave, roll, pitch) mean drift forcesand moments on the SWATH ship are calculated. Two important problems are that the horizontal driftforces may shift the SWATH ship's mean position, and the vertical drift forces may cause the SWATHship to tilt. Numerical results are presented in graphs, and pertinent discussion is given. It is found thatboth the horizontal and vertical mean drift forces indicate significant changes in the computations whenthe dimensionless wave frequencies are higher than 2.5.
• 中文關鍵字： SWATH ship; second order mean wave forces
• 英文關鍵字： --