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題名 | Time Simulation of Nonlinear Wave Loads on a Ship in Oblique Waves=斜向波中非線性波浪負荷之時程模擬 |
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作者 | 方銘川; 廖正民; Fang, Ming-chung; Liao, Cheng-ming; |
期刊 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
出版日期 | 19970900 |
卷期 | 21:5 1997.09[民86.09] |
頁次 | 頁454-465 |
分類號 | 444.1 |
語文 | eng |
關鍵詞 | 斜向波; 非線性波浪負荷; 時程模擬; Nonlinear wave loads; Time domain; Digital filter; |
中文摘要 | 本論文中提出了一以截片理論為基礎的方法來預測船隻在斜向波中所受之非線性 負荷。由於過去在流體動力學良好的發展,使得流體動力係數及力量可以預估得相當好,因 此在研究中,作著將船體視為一自由樑,而利用簡樑理論來預估船體之波浪負荷,如彎矩、 剪力及扭矩。本文中利用過去發展良好的線性基礎再發展一套分析大波浪中的非線性負荷模 式,此外,為了去掉橫移與橫擺之數值漂移現象,分別利用假想恢復力與數位濾波法之技巧 來去除此現象。而一系列之分析中得到一些有用的建議,可供作此類分析者參考。因此本文 所發展之計算過程,可視為預測船體運動與波浪負荷的有效分析工具之一。 |
英文摘要 | In the paper, a prediction method for the nonlinear wave loads of a ship advancing in oblique waves with infinite water depth is proposed. Because of the good development in the hydrodynamics, the corresponding hydrodynamic coefficients and forces on ships can be well estimated. With this good basis, the authors consider the ship as a free-free beam and use the simple beam theory to estimate the corresponding sea loads along the ship hull, i.e., the wave bending moment, shear force and torsion moment at any ship section. Based on the well developed linear theory, an analytical model of the nonlinear wave loads for a ship in large oblique waves is further constructed. Time domain analyses, including the instant grid generation technique (IGGT), for the corresponding sea loads are performed. Furthermore, to avoid the numerical drift phenomena in the sway and yaw mode motions, the Artificial Restoring Force Technique (ARFT) and Digital Filter Technique (DFT) are applied to solve five coupled equations of motion. A series of analyses is performed in this paper, and some valuable suggestions are also submitted. The calculation procedures developed here may be considered as an efficient analytical tool for researchers to predict the ship motions and wave induced loads. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。