半潛船為一種在商業海事領域已經廣泛應用的船舶，其主要作業模式為進行壓載下潛，即將壓載艙填滿水使其浸沒，以降低船體的重心，從而完成駁運大型物件的前置作業。由於下潛時因其形狀之緣故，使半潛船之穩度大幅降低，半潛船在惡劣海況下容易受到外力的影響，風浪和海流容易對半潛船的平衡和姿態穩定性造成挑戰，進而影響半潛船的作業效率和安全性，增加了船舶的運行風險。本篇論文主要為評估半潛船之耐海性能及穩度。於耐海性能方面，本篇論文以二維截片理論為基礎，於頻率領域進行船體五自由度運動之分析，並與船模試驗所量取之數值進行相互比較，從而驗證理論模型的準確性和可靠性，並提供相應的改進建議。於穩度方面，本篇論文以外掛軟體ORCA 3D以及軟體Rhino分別進行半潛船於靜水及波浪中之靜穩度分析，通過半潛船於不同海況下之靜穩度分析，可評估其在各海況下之穩度。經由上述之耐海性能及穩度分析，所得結果可作為後續設計和實際船舶性能比對的參考。

A semi-submersible vessel is a type of ship widely used in the commercial maritime industry. Its primary operational mode involves submerging its ballast tanks, which are filled with water to decrease the vessel's center of gravity, allowing it to perform preloading operations for transporting large objects. However, due to its submerged shape, the stability of a semi-submersible vessel is significantly reduced. It becomes vulnerable to external forces, making it challenging to maintain balance and posture stability, especially in adverse weather conditions like strong winds and currents. These factors can impact the efficiency and safety of the vessel, thereby increasing operational risks. This thesis aims to evaluate the seakeeping performance and stability of semi-submersible vessels.
In terms of seakeeping performance, the study utilizes two-dimensional strip theory and analyzes the vessel's five degrees of freedom motion in the frequency domain. The results are then compared with numerical data obtained from model tests to verify the accuracy and reliability of the theoretical model while providing recommendations for improvements.
Regarding stability, the thesis employs the external software ORCA 3D and Rhino to perform static stability analyses of the semi-submersible vessel in both calm water and waves. By conducting static stability analyses in different sea conditions, the vessel's stability can be assessed for various scenarios. The outcomes of the seakeeping performance and stability analyses mentioned above can serve as valuable references for subsequent designs and a practical comparison of the vessel's performance.

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