拓樸最佳化應用於艙口角隅之補強板設計

Optimum Design of Hatch Corner Using Topology Method

隨著貨櫃輪日益大型化，船舯段所承受之彎曲負荷也隨之加劇，進而造成局部結構的疲勞提早發生。根據相關研究結果顯示，船舯段艙口角隅是最容易發生疲勞的位置，因此本研究使用拓樸最佳化方法進行艙口圍緣角落補強板形狀的最佳化設計，希望有效提升船舶局部結構的疲勞壽命。本研究疲勞壽命預估採用BV開發之頻譜疲勞分析軟體HydroStar搭配Homer2進行，並考慮不同航速、載重狀況以及波浪拍擊船體所產生的波振效應；補強板的最佳形狀則是使用ABAQUS／ATOM以拓樸方法進行求解。評估結果顯示相同面積補強板在不同負荷狀況下，經形狀最佳化後之補強板至少可提升疲勞壽命達12年以上。因此，為有效提升船舶結構的可靠性，未來進行船舶局部補強結構的設計時，建議可搭配拓樸最佳化方法進行驗證。 With the enlargement trends of containership, the increased bending moment always loaded near the midship and caused local fatigue fracture occurred earlier. The related findings showed that hatch corner of midship hatch corner were the weakest location. In order to upgrade the fatigue life of local structure effectively, topology optimization method is used to design the optimum hatch corner shape in this study. The estimate of fatigue life is achieved using spectral fatigue analysis package HydroStar/Homer2 which is developed by BV. The various speeds, loading conditions, and springing effects are all considered. Besides, the optimum shape of hatch corner is using topological method in ABAQUS/ATOM to obtain. The estimated results show that the optimum shape of hatch corner can upgrade fatigue life at least 12 years. Therefore, topology optimization method is suggested to perform the local structure design of ship.