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Study on optimal structure used for offshore wind turbine facilities

海上风电机组优化结构研究

基本信息

批准号：
17560432
负责人：
SEKITA Kinji
金额：
$ 1.73万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

So as to expand offshore wind farms emerging around North-West Europe into Japan, we have to cope with natural environmental conditions such as severe typhoons, earthquakes, the soft seabed and steep bathymetry peculiar to our country. Substructures of a wind turbine should have due rigidity and strength with the configuration as to ward off wind loads. Since fluctuating winds, waves and various mechanical vibrations are acting on them, resonance evasion, reduction of those excitation and fatigue damage are required. So we have proposed a steel tube truss alternative to a conventional steel cylindrical tower for fixed bottom or floating facilities. To confirm the applicability, we carried out design of both substructures onto a 5MW wind generator, a wind tunnel model experiment and numerical study taken the pile and soil interaction into consideration. Finally, we concluded as follows ;1)The substructures made of a truss tower composed of small number of members having small diameter a … More nd jacket is better than a cylindrical tower and monopile. Although the weight of steel materials is larger about 1.7 times, the flexural rigidity is appropriately 1.5 times. This implies that proposed substructure takes advantage from the fatigue perspective.2)The first natural period of 2.5s obtained by the eigenvalue analyses can be longer than the period of 1.0-2.0s that a rotating blade intersects the tower, and shorter than rotating period of 3.0-6.0s. These periods pertaining to tower shadow effects due to wake bring varying member forces. Thereby, the optimal design avoiding the resonance from the natural period of the facility may be done.3)The measured out-of-plane accelerations and oscillation loads in the truss tower were smaller than those of the cylinder tower. The electricity generated by the truss tower is slightly larger.4)The truss tower with jacket foundation has enough ductility, such that it can deform four or five times during collapse compared with the deformation at yielding by a pushover analysis. Less

为了将西北欧周围出现的海上风力发电场扩大到日本，我们必须科普我国特有的自然环境条件，如严重的台风、地震、松软的海底和陡峭的水深。风力涡轮机的子结构应具有适当的刚度和强度，并具有抵御风载荷的构造。由于波动的风、波浪和各种机械振动作用于它们，因此需要避免共振，减少这些激励和疲劳损伤。因此，我们提出了一种钢管桁架替代传统的钢圆柱塔的固定底部或浮动设施。为验证该方法的适用性，对一台5 MW风力发电机进行了两种子结构的设计，并进行了考虑桩土相互作用的风洞模型试验和数值研究。最后得出以下结论：1）由少量小直径杆件组成的桁架塔的下部结构， ...更多信息端夹套优于圆柱形塔和圆柱形夹套。虽然钢材的重量大约1.7倍，但弯曲刚性适当地为1.5倍。2）由特征值分析得到的2.5s的第一固有周期可以长于旋转叶片与塔架相交的1.0-2.0s周期，并且短于旋转周期3.0-6.0s。这些时期属于塔影效应，由于尾流带来不同的成员部队。从而可以进行避免设施自振周期共振的优化设计。3）桁架塔的实测面外加速度和振动载荷小于圆柱塔。桁架塔的发电量略大。4）导管架基础桁架塔具有足够的延性，与pushover分析屈服时的变形相比，倒塌时可以变形4 ~ 5次。少