A tip deflection calculation method for a wind turbine blade using temperature compensated FBG sensors
A tip deflection calculation method for a wind turbine blade using temperature compensated FBG sensors
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DOI：
10.1088/0964-1726/21/2/025008
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发表时间：
2012-01
影响因子：
4.1
通讯作者：
Ki-Sun Choi;Y. Huh;I. Kwon;D. Yoon
中科院分区：
文献类型：
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作者：
Ki-Sun Choi;Y. Huh;I. Kwon;D. Yoon
应连续监测风力涡轮机叶片的尖端偏转，以防止叶片撞击塔架而导致风力涡轮机发电厂发生灾难性故障。本文提出了一种风力涡轮机叶片尖端挠度的计算方法，该方法采用基于任意梁弯曲和力矩理论的有限差分法，并使用测量的应变。使用光纤布拉格光栅传感器测量叶片应变。为了验证该方法，制造了 100 kW 复合材料风力涡轮机叶片，并在叶片的抗剪腹板上安装了环氧树脂模制光纤布拉格光栅 (FBG) 传感器。许多此类传感器（普通 FBG 探头）仅用于测量应变，而其他传感器（温度补偿 FBG 探头）也用于测量应变和温度。由于 FBG 传感器的输出信号取决于应变和温度，因此应通过温度对传感器输出信号进行补偿以获得准确的应变。这些 FBG 传感器在整个叶片长度上以一米的间隔安装在腹板的下部和上部。为了评估 FBG 传感器的测量精度，还将传统的电气应变计粘合到每个 FBG 传感器旁边的纤维网表面上。通过对叶片进行静载荷测试，计算出的叶片尖端挠度很好地确定在2.25%的平均误差范围内。
The tip deflections of wind turbine blades should be monitored continuously to prevent catastrophic failures of wind turbine power plants caused by blades hitting the tower. In this paper, a calculation method for wind turbine blade tip deflection is proposed using a finite difference method based on arbitrary beam bending and moment theory using measured strains. The blade strains were measured using fiber optic Bragg grating sensors. In order to confirm this method, a 100 kW composite wind turbine blade was manufactured with epoxy molded fiber optic Bragg grating (FBG) sensors installed in the shear web of the blade. A number of these sensors, normal FBG probes, were fabricated to only measure strains and the other sensors, temperature compensated FBG probes, were prepared to also measure strain and temperature. Because the output signals of FBG sensors are dependent on strains as well as temperatures, the sensor output signals should be compensated by the temperatures to obtain accurate strains. These FBG sensors were attached on the lower and upper parts of the web at one meter intervals throughout the entire length of the blade. To evaluate the measurement accuracy of the FBG sensors, conventional electrical strain gauges were also bonded onto the surface of the web beside each FBG sensor. By performing a static load test of the blade, the calculated tip deflection of the blade was well determined within an average error of 2.25%.