高速排水型船舶結構分析之水動力模式不確定性研究

Hydrodynamic Modelling Uncertainties of a High Speed Displacement Vessel in Structural Analysis

Various hydrodynamic models are used for prediction of wave loads on a high-speed displacement vessel and integrated with a structural Finite Element model for quasi-static structural analysis These hydrodynamic models include 2D strip theory, 3D pulsating source distribution method and 3D translating pulsating source distribution technique Comparisons between numerical results and experimental data for wave loads on the vessel are made to establish uncertainties due to three-dimensional effect and forx4ard speed effect Using short-term and long-term statistical analysis, extreme wave loads obtained by these models are compared with rule based values Furthermore, wave patterns, dynamic pressure distributions, the stress strain responses of the vessel to different hydrodynamic loadings are discussed. 本研究探討使用不同之水動力模式，對高速排水型船舶之波浪負荷及全船結構進行分析之不確定性影響因素，水動力模式包括二維截片法、三維振盪格林函數法及三維前進－－振盪格林函數小板法，理論計算結果並經船模試驗之驗證，比較結果顯示：數值模式之不確定性因素來自船體三維效應及前進速度之影響。本文並採用短期及長期波浪負荷反應統計分析，配合不同之水動力數值模式，評估一艘高速排水型單體船之極值波浪負荷，並與各船級協會之設計值進行比較分析；在不同水動力模式作用下，亦針對船體之波型、動態壓力分佈及全船結構應力／應變反應進行影響因素探討。