A comparative study of motion performance of four different FOWT designs in combined wind and wave loads
A comparative study of motion performance of four different FOWT designs in combined wind and wave loads
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DOI：
10.1115/omae2014-24643
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发表时间：
2014-06
影响因子：
0.8
通讯作者：
Y. Nihei;K. Iijima;M. Murai;T. Ikoma
中科院分区：
文献类型：
--
作者：
Y. Nihei;K. Iijima;M. Murai;T. Ikoma
本文总结了大阪国立大学、大阪大学、横滨国立大学和日本大学等四所大学在浮式海上风电机组方面的合作/竞争工作。分配给每个成员的任务是开发能够支持5兆瓦级风力涡轮机的各自的FoWT设计，然后根据他们自己的概念制造一个比例尺模型，最后在规定的环境(风浪)条件下通过水箱测试来评估性能。大阪府大学。采用TLP概念，横滨国立大学。半潜式概念，日本大学SPAR概念，大阪大学。不过，也采用了单点系泊的半潜式。收集所有测量数据，并在四种设计之间进行比较。结果表明：(1)所有提出的设计都满足研究开始时假设的动作表现标准。(2)在几乎所有的环境条件范围内，TLP类型表现出最好的性能，而Spar类型表现出最大的加速度。较大的加速度可能会带来可维护性问题。(3)Spar类型比其他类型受旋转影响更大。(4)除单点系泊半潜器外，其他概念在风浪联合作用下的运动RAO与仅在波浪作用下的运动RAO基本相同。(5)单点系泊半潜器RAOS的差异可能归因于复合载荷作用下主浮体和系泊系统之间的耦合作用较大。版权所有：ASME
This paper summarizes our recent collaborative/competitive works on floating offshore wind turbines (FOWTs) among four universities including Osaka Prefecture Univ., Osaka Univ., Yokohama National Univ., and Nihon Univ. The tasks assigned to each member were to develop the respective FOWT designs which could support 5MW class wind turbine, then to fabricate a scale model based on their own concept, and finally to evaluate the performance by tank tests under prescribed environmental (wind and wave) conditions. Osaka Prefecture Univ. adopted TLP concept, Yokohama National Univ. semi-submersible concept, Nihon University SPAR concept while Osaka Univ. also adopted semi-submersible, however, with single-point mooring. All the measured data were collected and compared among the four designs. It turned out that: (1) All the proposed deigns suffice criteria in terms of motion performance which were assumed at the beginning of the study. (2) The TLP type shows the most favorable performance among the four while the SPAR type shows largest acceleration in almost all the range of environmental conditions. The large acceleration may pose a problem of maintainability. (3) The SPAR type suffers the gyration effects more than the other types. (4) The RAOs of motions under combined wind and wave loads are almost the same as those under only wave loads for all the concepts but the single-point moored semisubmersible. (5) The difference of the RAOs for the single-point moored semisubmersible may be ascribed to the larger coupling effects between the main floater and the mooring system under the combined loads.Copyright © 2014 by ASME