采用两步式模型修正过程识别海上风电支撑结构的损伤

Damage identification of offshore wind turbine support structure with a two-step model updating process

针对海上风电支撑结构损伤识别的难点,将一种新的模型修正方法应用到了三脚架式海上风电支撑结构的损伤识别中。采用数学上常用的正则化方法,解决了实测模态含噪声条件下损伤识别"病态"方程组的求解问题;结合Guyan扩阶技术,实现了基于低阶不完备模态的损伤识别。另外,为提高损伤识别精度,结合算例提出一种两步式模型修正过程:第一步,初步定位损伤位置;第二步,精确识别损伤位置和损伤程度。数值研究结果表明,采用两步式模型修正过程的方法对于海上风电支撑结构的损伤识别是有效的。

Through a numerical example,a recently developed model updating method is applied to identify the damages of the tripod-type offshore wind turbine support structure. Regularization method of mathematics is used to solve the＂ill-conditioned＂damage identification equations when noise polluted measured modes are used. With Guyan expansion technology,damage identification is realized based on a few low order incomplete modes. Moreover,in order to improve the accuracy of damage identification,a two-step model updating process is proposed. The first step is to locate damage position. The second step is to identify damage location and damage severity accurately. Results of numerical examples show that the method used in this paper is effective for damage identification of offshore wind structure.