碩士 / 國立成功大學 / 土木工程學系 / 104 / The development of renewable energy is always an international issue. With the Fukushima nuclear disaster, the controversial discussion over the renewable energy was revoked. It is suitable to develop the technology of the offshore wind-turbine with the great wind-farms in Taiwan Straits. However, comparing to Europe, earthquakes occurred more frequently in Taiwan. In order to ensure the seismic safety of the wind turbine structure, the seismic resistance capacity of the turbine structure needs to be further investigated. To this end, the technology of the mass damper (MD) was adopted in this research. Two different types of the MD technology were investigated. One is the passive friction-MD and the other one is semi-active mass damper (SAMD), which was accomplished by adding an adjustable friction device to the passive friction-MD. Because of the slenderness of the wind-turbine structure, the rocking angle of the nacelle on the top of the tower may influence the global seismic behavior of the turbine structure with the MD. Therefore, this nonlinear behavior is considered in the thesis. Meanwhile, in order to increase the computational efficiency, the dual-system analysis method was adopted, so the whole system is divided into two substructures: the nonlinear MD-substructure and linear tower-substructure. In this case, the high-efficient computation can be retained in the linear tower-substructure.
The simulated result has demonstrated that the MD is a very effective means for mitigating the seismic responses of the wind-turbine structure even when the nonlinear effect due to the rocking angle of the nacelle is considered. It is also shown that there is no significant difference between the results simulated by the linear and nonlinear analysis methods for the turbine structure with or without the MD. As for the SAMD, the simulated results showed that the SAMD is able to substantially suppress the stroke of the nacelle and the base shear of the tower, although the nacelle acceleration may be slightly increased in the turbine structure with the SAMD.
| Identifer | oai:union.ndltd.org:TW/104NCKU5015016 |
| Date | January 2016 |
| Creators | Bo-HuaLin, 林柏樺 |
| Contributors | Hsuan-Teh Hu, Lyan-Ywan Lu, 胡宣德, 盧煉元 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 142 |
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