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題名 | 考慮流固藕合效應之環板水下振動研究=Coupled Fluid-Structure Interaction Problems--A Study of Vibration on Submerged Annular Plate |
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作者姓名(中文) | 梁卓中; 賴文豪; 李必良; | 書刊名 | 中國造船暨輪機工程學刊 |
卷期 | 17:2 1998.05[民87.05] |
頁次 | 頁17-30 |
分類號 | 444.1 |
關鍵詞 | 浸水; 環板; 流固藕合; Submerged; Annular plate; Fluid-structure interaction; |
語文 | 中文(Chinese) |
中文摘要 | 本文研究有關環板(annular plate)水中強迫振動之問題,並假設流體為不可壓 縮、無黏滯度及無旋性。 以貝色函數 (Bessel function) 為環板模態函數,作用於環板之 流體壓力以附加質量係數來處理,並代人薄板振動偏微分方程式,利用模態函數正交性之關 係,簡化成為常微分方程式,採用摺積積分法求解環板結構動態反應。文中以方形波、三角 形波及指數衰減形波三種脈衝負荷為例,分析水下環板結構承受此三種不同外力 (尖峰壓力 均為 40000N/m, 作用時間均為 8.3*10�笐� sec) 作用之動態反應, 分析結果與套裝軟體 (ABAQUS/USA)--非限性有限單元軟體 ABAQUS 及水下爆震分析程式 USA 之計算結果相當吻 合。 由結果顯示, 綱質環板在水中承受方形及指數衰減脈衝作用時, 分別空氣中撓度的 0.78 與 0.76 倍。但其承受三角脈衝作用時,約為空氣中撓度的 0.60 倍。 本文所建立水 下環板結構藕合動態反應理論,可為水下載具設計及評估提供一套簡單可行的計算方法。 |
英文摘要 | This study examines the forced vibration of submerged annular plate having contact with stationary fluid on one or both sides. The fluid is assumed to be incompressible, inviscid and irrotational. For the transient response of forced vibration, the mode shape function of annular plate is assumed to be bessel function. The fluid pressure is assumed to be represented by added mass for use in the partial differential equations for the plate. Then, thetransient response of submerged annular plate is solved by Duhamel integral. The input forces are of three type, rectangular, triangular and exponential pulse. The results is compared with ABAQUS and USA- nonlinear FEM code and underwater shock analysis code with good agreement. It is shown that the maximum deflections of submerged annular plate, subjected to rectangular, exponential and triangular pulses, are respectively 0.78,0.76 and 0.60 times of that in air. The purpose of this research was to establish the fluid-structure interaction theorem of submerged annular plate, and offer a simply calculating method for designing underwater vehicle. |
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