碩士 / 國立海洋大學 / 系統工程暨造船學系 / 89 / Recently, even through a three-dimensional theory can be used to improve the numerical method in evaluating the seakeeping performance of ships and has been well edited in computer code. Nevertheless, the application of such kind development to preliminary design of a ship still indicates impractical since the computation is very time-consuming in solving the transient Green’s function in the theory. Therefore, the two-dimensional strip theory still plays an important role in predicting the wave loads of ship in waves. After some modifications it can provide an quick and accurate solution.
In this paper, a modified two-dimensional strip method based on the linear theory by Salvensen et al (1970) and the nonlinear theory by Wu and Hua (2000) is utilized to predict the motion responses, the wave loads and the wave-induced shear forces and bending moments in ship sections of a high speed vessel.
As an application of the modified two-dimensional strip method, the wave load analysis of a high-speed displacement vessel, RD200, is performed as an example. This vessel rails in waves at a Froude number . By applying the linear theory of Salvensen et al the results of wave load will deviate with the increase of ship speed. Thus, in the case of , the nonlinear strip theory will be adopted to take the nonlinear slamming force into consideration. Furthermore, the wave load characteristics in head sea condition is discussed.
Finally, the effects of related parameters on wave load are discussed. Also the envelops of the wave-induced internal shear forces and bending moments are constructed and input to a stress analysis program, WARSHP, for multi-celled thin beam structures to attain the stress response transfer function of each part of the structural members. Then the stress spectra of ship structure can be obtained for the purpose of ship’s strength evaluation. The analysis system and the interface codes are edited with MATLAB.
| Identifer | oai:union.ndltd.org:TW/089NTOU0345005 |
| Date | January 2001 |
| Creators | Te-Jung Fu, 傅得溶 |
| Contributors | Wei-Hui Wang, 王偉輝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 87 |
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