Numerical Study of Hydrodynamic Pressure on a Ultra Large Container Ship in Oblique Waves

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基本資料

Project title

Code/計畫編號

MOST109-2221-E019-019

Translated Name/計畫中文名

特大型貨櫃船在波浪中之動態壓力數值研究

Project Coordinator/計畫主持人

Chih-Chung Fang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Systems Engineering and Naval Architecture

Website

https://www.grb.gov.tw/search/planDetail?id=13540261

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

849千元

ResearchField/研究領域

機械工程

隨著全球經濟的發展，海洋運輸產業越來越趨向增加單一航程的載貨數量，據以降低單位貨物的運輸成本，使得商船的尺寸愈來愈大，國內目前最大建造完成之貨櫃船為容積噸位14000 TEU貨櫃船，但國際上在2019年起，特大型貨櫃船已經突破容積噸位20000 TEU的運載量，其在波浪中航行時的運動、負荷反應，以及波浪壓力作用下的結構反應分析更顯得格外重要，但國內仍缺乏相關研究。本研究應用三維前進-振盪源流格林函數小板法(HSC-3D)，考慮船舶前進速度效應，船體之輻射波壓力與繞射波壓力受自由表面邊界條件以及物體表面邊界條件之船舶前進速度效應影響，在不同船舶前進速度下會呈現不同的波浪壓力分佈，此波系較接近船舶在波浪中所造成自由表面跡流的實際情況，對於船殼在波浪中之受力則更加合理，本研究選擇國內尚未有建造實績的特大型貨櫃船，在設計船速23節下、進行計算特大型貨櫃船的繞射波壓力、輻射波壓力分量分布及波浪動態總壓力分布特性，藉以觀察斜浪中不同航向角之間的變化，對於前進速度之影響，則計算船舶前進度23及15節，探討船速對於自由表面上各種波浪壓力分量分佈特性，對特大型貨櫃船而言，此動態波浪壓力負荷為船舶受到最主要且最經常發生的外力負荷，此負荷特性對船體結構影響最為重要，其對特大型貨櫃船直接整體強度分析十分重要，並為船體長期分布之極值負荷預估之核心技術。 This research uses the three dimensional translating-pulsating green function panel code (HSC-3D) to carry out the hydrodynamic analysis of a 20,000 TEU class ultra large container ship. In order to raise the carrying capacity and decrease the transportation cost of a unit cargo, the ultra large container ship design is more and more important in the international ship building market. The seakeeping performance between ships has been significant different along with their growing size in the same ocean environment. This design method can apply the hydrodynamic load directly on ship structural members for stress response analysis. The primary object of this study is to establish a confidence in the reliability of the hydrodynamic calculations. After the linear coupled equations of motion are solved in the frequency domain, the three-dimensional motion-induced radiation pressure distribution can be obtained together with quasi-hydrostatic pressure, the Froude-Krylov and diffraction pressure distributions. The dynamic global wave loads can be obtained by the integration of these hydrodynamic pressures and inertia loads. These wave forces also lead to structural deformation and stress responses. It is the key point to coupling the wave forces from the panel method to finite element method and do the structural analysis.

Keyword(s)

特大型貨櫃船
三維小板法
船舶運動
波浪動態壓力
Ultra large container ship
3-D panel method
Ship motion
Hydrodynamic wave pressure

DSpace CRIS

Numerical Study of Hydrodynamic Pressure on a Ultra Large Container Ship in Oblique Waves

基本資料

Description