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題名 | A Method for Simulating Ship Motions in Oblique Waves=斜向波中船體運動模擬方法 |
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作者 | 方銘川; 陳宣宇; Fang, Ming-chung; Chen, Shuan-yu; |
期刊 | 成功大學學報 |
出版日期 | 19981100 |
卷期 | 33(科技.醫學篇) 民87.11 |
頁次 | 頁131-152 |
分類號 | 444.8 |
語文 | eng |
關鍵詞 | 非線性運動; 大波幅; 即時網格; 人造恢復力; 數值濾波器; Nonlinear motion; Large wave amplitude; IGG; ARFT; DFT; |
中文摘要 | 本文之目的是要建立一套能模擬在斜向波航行的非線性船體運動的一般數學模 式。由於在頻率領域申之船體運動分析通常限制在線性範圍內,因此在本論文中 將其延伸為非線性分析,其中包括大波幅、大運動及水下船殼運動之影響。為了 節省電腦輸入的時間,本文中亦發展了一套即時網格產生技巧來產生原點分佈, 以便計算時程領域之流體動力係數。而為了避免橫移與平擺運動所產生的數值漂 移現象,本文中方利用人造恢復力技巧與數值濾波器技巧來解五度運動偶合方程 式。經由本文之一系列的分析探討,可得到一些有價值之結論建議,對於其他相 關研究工作,例如:斜向波中之上水、動穩度及翻覆等現象之分析將有所幫助。 |
英文摘要 | The purpose of the study is to set a general model for simulating the nonlinear motion of a ship advancing in oblique waves in time domain. Because the ship motion analysis in the frequency domain is usually con fined in the linear range. The present paper extends the study to include the nonlinear effects which are due to the large wave amplitude, large ship motions and the change of hull configuration below the free surface. For saving the large amount of labor work in the input preparation, an Instant-Grid-Generation (IGG) technique is also developed to create the source point distributions along the ship hull configuration for calculating the hydrodynamic coefficients. Besides, to avoid the numerical drift phenomena in the sway and yaw mode motion, the Artificial Restoring Force Technique (ARFT) and Digital Filter Technique (DFT) are applied to solve five coupled equations of motions. A series of analyses are made in the paper and some valuable suggestions are also proposed, which will be helpful for researchers to do the related works, e.g. the oblique wave profile along the ship length, water shipping and the dynamic stability and capsize analysis in oblique waves. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。