Static and Fatigue Analysis of Composite Turbine Blades Under Random Ocean Current Loading
Static and Fatigue Analysis of Composite Turbine Blades Under Random Ocean Current Loading
复制标题
随机海流载荷下复合材料涡轮叶片的静力和疲劳分析
DOI：
10.4031/mtsj.47.2.6
复制
发表时间：
2013
影响因子：
0.8
通讯作者：
H. Hanson
中科院分区：
文献类型：
--
作者：
Fang;H. Mahfuz;G. Alsenas;H. Hanson
本文的目的是研究如何将美国国家可再生能源实验室(NREL)设计的用于风力机叶片设计和分析的建模工具应用于海流涡轮机(OCT)的设计。利用NREL的PreCom、BMODES、AIRDYN、FAST等软件对水平轴海流涡轮复合材料叶片的设计、静力分析和疲劳寿命预测进行了研究。用PreComp软件计算了该OCT叶片的截面性能。BModes计算出叶片的振型和频率。用Aerodyn计算了佛罗里达州南部墨西哥湾流(北纬26o4.3‘，西经79o50.5’，深度25米)涡轮叶片上的载荷。然后用FAST得到叶片的动态响应，包括襟翼和边缘弯矩相对于叶片旋转的分布。静力分析采用Sandia的NuMAD和有限元分析软件相结合的方法。基于DOE/MSU复合材料疲劳数据库中的材料疲劳性能数据，采用Palmgren-Miner的累积疲劳损伤模型进行损伤估计。在使用寿命期间，OCT叶片承受循环载荷和随机海流载荷。因此，叶片承受反复和交变的应力，这可能导致疲劳失效。这些负荷是根据东南国家海洋可再生能源中心(SNMREC)进行的现场测量直方图分析中的出现率进行加权的。
The objective of this paper is to investigate how U.S. National Renewable Energy Laboratory (NREL)-designed modeling tools commonly used for wind turbine blade design and analysis can be applied to the design of ocean current turbines (OCT). Design, static analysis, and fatigue life predictions of a horizontal-axis, ocean current turbine composite blade were investigated using NREL's PreCom, BModes, AeroDyn, FAST with seawater conditions. PreComp was used to compute section properties of this OCT blade. BModes calculated mode shapes and frequencies of the blade. Loading on a turbine blade in the Gulf Stream at a South Florida location (26o4.3'N 79o50.5'W, 25-m depth) was calculated with AeroDyn. FAST was then used to obtain the dynamic response of the blade, including flap and edge bending moment distribution with respect to blade rotation. Static analysis was performed by using a combination of Sandia's NuMAD and ANSYS. Palmgren-Miner's cumulative fatigue damage model was employed with damage estimation based on the material fatigue property data in DOE/MSU Composite Material Fatigue Database. During service life, OCT blades are subjected to cyclic loads and random ocean current loading. Hence, the blades experience repeated and alternating stresses, which can lead to fatigue failure. These loads were weighted by rate of occurrence from a histogram analysis of in situ measurements conducted by the Southeast National Marine Renewable Energy Center (SNMREC).