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
- Laser & Optoelectronics Progress
- Vol. 58, Issue 4, 0411001 (2021)
Fig. 1. Binocular stereo imaging model
Fig. 2. Flow chart of improved ERA
Fig. 3. Experiment configuration. (a) Binocular camera measuring instrument; (b) experimental constraint state; (c) identification of No.9 coded marker; (d) wind turbine blade
Fig. 4. Camera calibration result
Fig. 5. Vibration displacement curves of coded marker. (a) X direction; (b) Y direction; (c) Z direction
Fig. 6. Stabilization diagrams for traditional ERA. (a) X direction; (b) Y direction; (c) Z direction
Fig. 7. Stabilization diagrams after noise removal by SVD. (a) X direction; (b) Y direction; (c) Z direction
Fig. 8. Diagrams of damping and frequency. (a) X direction; (b) Y direction; (c) Z direction
Fig. 9. Stabilization diagrams for improved ERA. (a) X direction; (b) Y direction; (c) Z direction
Fig. 10. Normalized singular values. (a) X direction; (b) Y direction; (c) Z direction
Fig. 11. Stabilization diagram for B&K instrument
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Table 1. Natural frequency identification results of blades unit: Hz
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Table 2. Natural frequency identification error of blades unit: %
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