- 學位論文
有感設計流程於劍艏船型阻力性能改善之整合應用
Application of User-Feedback-Design on Improvement of the Sword-Bow Hull-Form and Analysis of Its Resistance Performance Under Operation Conditions
摘要
提高能源利用效率是目前科技發展的趨勢，尤其以大型貨櫃輪等巨大海上耗能的交通工具為首要目標。船型精進可以在設計條件維持下，使總阻力降低以達到節省能源的效果。球艏船型可以在設計航速下減低阻力，在非設計點則效能不彰，劍艏船型相對於傳統球艏船型減阻航速適應域較廣。 本研究目標為劍艏船型之精進，在不影響載貨量及穩度的條件下逐步降低興波阻力。本研究開發一整體有感設計模式，整合B-Spline曲線控制點變化建模及三視圖船舶線形分析進行即時設計，並搭配演算法及B-spline曲線變形進行最佳化。另為驗證精進後船型改善程度，使用自動化勢流計算搭配現有貨櫃輪實際營運狀況時間權重，統合分析各船型於設計點及總和實際營運情況下之加權平均阻力性能，並藉以驗證達成局部最佳化之目標。初步研究成果達成設計點興波阻力係數下降3.5%，以實際營運狀況評估則可下降2.5%。船型精進可確實降低總阻力，在設計點以外之精進效果則較不明顯。
並列摘要
This thesis briefly describes the newly developed hull form transformation method called User-Feedback-Design, and also delivers an example to a Sword bow hull form joint with a real-sea operation profile. For an aim of better wave-making performance compared to the original sword bow type hull form and better maneuver performance compared to traditional bulbous bow hull form. Non-uniform rational B-spline theory was applied on the forebody sections to guarantee surfaces with high-order smoothenss. All principle dimensions are kept the same for improvement checking. With the B-spline control point model building and immediate ship lines viewer, two new sword bow type hull forms have been developed. For the application of the real-sea operation profile, a full-automatic potential flow computation has been involved, which allows the evaluation of different operation conditions. Thus, the overall wave-making resistant performance could be obtained. The results show that the new hull forms have improvements in wave-making coefficient by 3.5%. However, if we introduced the real-sea operation factor, the value goes down to 2.5%. The advantage of new hull forms is reduced beyond design condition.