碩士 / 國立臺灣大學 / 工程科學及海洋工程學研究所 / 94 / Parametric rolling is an unstable phenomenon, which can rapidly induce large roll angles if significant pitch motions are also coupled with them. In the case of occurrences of the rolling in phase with pitching motions, high loads can be introduced into the containers and their lashing system. It is known that post-Panamax containerships are susceptible to this condition and cause damage and lost of containers overboard. It is thus an important issue regarding the increasing size of containerships with a huge number of containers (more than 8,000 TEU) to be designed and built in the next years. In head or stern seas the irregular wave surface accompanied by the pitch and heave motions of the ship results in a time-varying underwater hull geometry. This variation in the geometry, in turn, gives rise to time-varying changes in the metacentric height GM. Under some cases with certain combinations of the ratios of the wavelength to the ship length and the natural period of roll to the wave encounter period the parametric resonance will occur. This paper presents results from the numerical simulation of the parametric rolling, which is described with the Mathieu equation. For simplicity, only regular waves conditions are considered.
| Identifer | oai:union.ndltd.org:TW/094NTU05345020 |
| Date | January 2006 |
| Creators | Ming-Yu Wu, 吳明祐 |
| Contributors | 郭真祥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 232 |
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