碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 105 / In studies of general ship collisions, the added mass is obtained by using the empirical formula. However, the added mass coefficient varies depending on differences in the ship’s speeds and sea conditions. In this paper, a three-dimensional panel method was used to obtain the added mass coefficients of a ship at different speeds. The results of added mass calculation will be evenly distributed with respect to mass element on the underwater hull structure. A nonlinear finite element software (LS-DYNA) was used to analyze these circumstances; a collision between ship’s bow and rigid plate, a collision ship’s bow and wind tower and finally, with tow trimarans colliding each other. The reason for such analyze is to explore the level of structural damage in trimarans.
The ship’s bow structure was divided into different structural groups to explore the structure of the main energy absorption at the time of collision, and analysis of the speed of 9 knots and 25 knots under the crash of rigid plate, the crashing angle of 0 degrees, 15 degrees, 30 degrees, and 45 degrees. At the same time, it is also analyzed that the bow crashing position offset 0m and 1.5m crashing the wind tower at the speed of 9 knots. When sihp A collide ship B’s side hull, the crashing point is 14.35m from the stern. The cabin compartment structural of the ship B is divided with different structural groups. In this case both speed 9 knots and 25 knots with crashing angle of 0 degrees and 45 degrees will de analysis with four different results. The result of added mass of collision depth, energy change and structural damage are compare with nonadded mass result. The results of crashing depth will be greater when added mass is included; when the speed and crashing angle remain the same. The energy change exnibit to be more substaintial as crashing angle increase; when the speed and added mass remain the same. When sihp A collide ship B’s side hull, both ship A’s bow structural and ship B’s side hull structural will be overview in terms of collision depth, energy change and structural damage. The damage to the structural of ship B is more serious than ship A, to the ship A has the most serious damage to the bow structural at crashing angle of 45 degrees, ship B has the most serious damage to the bow structural at crashing angle of 0 degrees.
| Identifer | oai:union.ndltd.org:TW/105NTOU5345017 |
| Date | January 2017 |
| Creators | Chiang, Tsung-Lin, 江宗霖 |
| Contributors | Chiu, Jinn-Tong, Fang, Chih-Chung, 邱進東, 方志中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 135 |
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