環境外力作用下繫纜船舶之非線性反應分析

本研究所發展的繫纜船舶運動模擬系統是考慮風和浪的作用下的繫纜船舶動態模擬。在繫纜船舶運動模擬系統中考慮的因素包括：繫泊船、彈性懸垂纜繩、彈性防舷材。本研究依照已發展成熟的線性截片理論建立船體六自由度的運動方程式，但在非線性的繫泊纜繩張力及防舷材反力的交互作用下，使得運動方程式變成一非線性運動方程式，因此在時間域上逐時求解運動方程式。本研究建立了一套嚴謹的數值模擬程式可以預測包含波長、波高、波向角、風速、風向角等變數的非線性反應。經過此一模擬程式運算後可以得到時序列上的船體運動、繫纜張力、防舷材反力等，在得到這些繫纜船舶的非線性反應特性後進一步討論其中的相關性。本研究以VISUAL C++程式語言撰寫繫纜船舶運動模擬系統，將風、浪等分別建立物件，可單獨選用進行運動模擬，亦可同時選用。

關鍵字

繫泊船；懸垂纜繩；非線性反應；環境外力

並列摘要

In the present study, a numerical model is developed for simulating the dynamic responses of a mooring ship system under the action of waves and winds. In the mooring system, a mooring ship, elastic catenary mooring lines and elastic fenders are considered. A linear strip method is applied to formulate the 6-DOF ship motions, but the interacting nonlinear forces of the mooring lines and fenders make the equations of motion nonlinear and have to be solved in time domain step by step. A series of numerical simulation has been conducted for investigating the nonlinear responses dependence on wave length, wave height, wave direction, wind speed and wind direction. Through the simulation, the time histories of ship motion, tension forces of mooring lines, and reacting forces of fender are obtained, and the characteristics of the nonlinear responses of a mooring ship system are discussed.

並列關鍵字

Mooring ship ； Catenary line ； Nonlinear responses ； Environmental forces

參考文獻

[5] Natarajan, R. and Ganapathy, C (1995). "Analysis of Mooring of a Berthed Ship," Marine Structures, Vol. 8, pp 481-499.

[6] Herman Bomze, and Frederic R. “Analytical determination of Ship Motion and Mooring Force,”Proc Offshore Technology Conference, paper No 2072, 1974

[8] Bathe, K.J. and Wilson, E.L. ,”Numerical Methods in Finite Element Analysis,”Prentice-Hall,1976

[10] Hess, J.L. and Smith, A.M.O. ,”Calculation of non-lifting potential flow about arbitrary three-dimensional bodies,”J.Ship Res.,8:22-24,1964

[11] Hess, J.L. and Smith, A.M.O. ,”Calculation of non-lifting potential flow about arbitrary three-dimensional bodies,”Douglas Report, No. E.S.40622,1962

國際替代計量

環境外力作用下繫纜船舶之非線性反應分析

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