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頁籤選單縮合
題 名 | A Preliminary Study on the Transient Motions of Two-Dimensional Floating Bodies=二維浮體之非線性暫態運動初步研究 |
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作 者 | 方志中; | 書刊名 | 中國造船暨輪機工程學刊 |
卷 期 | 18:1 1999.02[民88.02] |
頁 次 | 頁1-10 |
分類號 | 443.1 |
關鍵詞 | 暫態運動; 大振幅運動; 波譜法; 時域; Transient motion; Large amplitude motion; Spectral method; Time domain; |
語 文 | 英文(English) |
中文摘要 | 本文利用簡單之源流分佈於浮體表面,並以波譜型式來代表自由液面速度勢,建 立二維非線性暫態浮體運動理論,其符合線性自由表面邊界條件,並允許物體作非線性之大 振幅運動,此一方法首先由 Chapman[11] 於 1979 年提出。 在初步研究階段,暫態運動問題將在時域中進行分析,數值計算經由傅利葉轉換,可將浮體 暫態運動結果與理論解及實驗值在頻域作一驗證及比較。對於二維沉沒圓柱體之水動力係數 計算,本文之非線性運動理論與 Ogilive[13] 發表的理論十分一致; 但對於二維矩形浮體 之阻尼係數計算,非線性理論預估值較 Vugts[14] 發表之實驗值略高。 |
英文摘要 | In this paper, a nonlinear mehtod for solving the transient motion problem of two-dimensional bodies has been formulated. The free surface is linearised but the exact body boundary condition permits large amplitude motions. The combined simple body source and spectral representations of the free surface have been applied to solve the transient motion problem. This novel treatment for studying such unsteady free surface problems is first proposed by Chapman [11]. In the preliminary research stage, the nonlinear numerical model has been validated by the results of linear hydrodynamic coefficients of two-dimensional bodies obtained from the published theoretical and experimental data. For a submerged circular cylinder, the numerical calculations for hydrodynamic coefficients in heave mode are in very good agreement with the analytical solutions given by Ogilvie [13]. The numerical calculations for the radiation damping coefficients of a floating rectangle are slightly higher than the experimental measurements reported by Vugts [14]. |
本系統中英文摘要資訊取自各篇刊載內容。