Laser & Optoelectronics Progress, Volume. 58, Issue 4, 0411001(2021)
Modal Identification Method of Blade Based on Photogrammetry and Improved ERA
Through arranging coded markers on the blade surface of a wind turbine, and based on binocular stereo imaging principle and image feature matching and tracking method, the spatial motion information of coded markers can be obtained dynamically and in real time. Aiming at the problem of noise pollution affecting modal identification, a singular value decomposition (SVD) and Cadzow algorithm was used to construct a Hankel matrix without noise pollution, which effectively reduces false modals caused by noise. In order to solve the problem that false modes are easy to appear in the process of modal order determination, an improved eigensystem realization algorithm (ERA) is proposed. Compared with the traditional ERA, the proposed method improves the accuracy of natural frequency identification by 3.6% and obtains a clearer stabilization diagram.
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Weiming Quan, Yingfu Guo, Wenyun Wang, Longzhou Zou. Modal Identification Method of Blade Based on Photogrammetry and Improved ERA[J]. Laser & Optoelectronics Progress, 2021, 58(4): 0411001
Category: Imaging Systems
Received: Jun. 15, 2020
Accepted: Aug. 3, 2020
Published Online: Feb. 4, 2021
The Author Email: Wang Wenyun (wwy73210693@163.com)