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A structural fault detection method and system for measuring relative deformation of wind turbine blades

A technology of relative deformation of wind turbine blades, which is applied in the direction of measuring devices, instruments, and optical devices, and can solve problems such as failure and measurement of difficult-to-rotate blades

Active Publication Date: 2019-10-29
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional DIC method will fail to match images of deformed objects with a rotation angle greater than 7°, so it is difficult to apply to the measurement of rotating blades

Method used

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  • A structural fault detection method and system for measuring relative deformation of wind turbine blades
  • A structural fault detection method and system for measuring relative deformation of wind turbine blades
  • A structural fault detection method and system for measuring relative deformation of wind turbine blades

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Experimental program
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Effect test

Embodiment 1

[0080] figure 1 It is a flowchart of a structural fault detection method based on measuring the relative deformation of wind turbine blades in an embodiment of the present invention, such as figure 1 As shown, the structural fault detection method for measuring the relative deformation of wind turbine blades provided by the present invention includes:

[0081] Step 101: Obtain a reference area and a deformation area.

[0082] The reference area is an area selected on the blade surface image before deformation, and the reference area includes several feature points of the reference area; The transformation algorithm obtains a deformed area matching the reference area, and the deformed area includes several deformed area feature points corresponding to the reference area feature points; the number of horizontal pixels of the reference area and the deformed area The number of pixels is the same.

[0083] Step 102: Calculate the rotation angle θ of the deformed area relative to...

Embodiment 2

[0165] Figure 4 It is a structural diagram of a structural fault detection system for measuring the relative deformation of wind turbine blades in an embodiment of the present invention, as Figure 4 As shown, the structural fault detection system for measuring the relative deformation of wind turbine blades provided by the present invention includes:

[0166] A reference area and deformation area acquisition module 201, configured to acquire a reference area and a deformation area; the reference area is an area selected on the blade surface image before deformation, and the reference area includes several reference area feature points; the The deformed area is to perform feature point matching on the deformed blade surface image to obtain a deformed area matched with the reference area, and the deformed area includes several deformed area feature points corresponding to the reference area feature points; the reference The number of horizontal pixels and the number of vertic...

Embodiment 3

[0180] The invention is used to measure the deformation of a fan blade containing a crack defect, and diagnose the crack position. According to the measurement method provided by the invention, the measurement process is:

[0181] To measure an iron fan blade, saw a crack with a depth of about 0.5mm on the back of the blade to simulate the crack defect of the blade. Spray black and white speckle particles on its surface before the experiment, fix the fan shaft on the experimental platform after installation, fix the dual camera system on the front of the blade, adjust the position of the camera to ensure clear imaging of the blade during rotation, and calibrate it The internal and external parameters of the system.

[0182] Take the leaf in its horizontal position as a reference position and take its image. Then rotate the blade counterclockwise about 20° as the target position, and use the screw micrometer to load the front of the blade tip at the target position to 10mm, 2...

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Abstract

The invention discloses a structural fault detection method and a system for measuring the relative deformation of a wind turbine blade, wherein the method comprises: calculating a rotation angle of adeformation region relative to a reference region; generating a deformation region parameter; updating pixel coordinates of the deformation region after rotating the angle; calculating a pixel pointmatching correlation coefficient of the reference region and the updated deformation region; updating the deformation region parameter; updating the pixel coordinates; calculating the pixel point matching correlation coefficient of the reference region and the deformation region after the second update; comparing the pixel point matching correlation coefficient of the deformation region after thesecondary update with a preset threshold value; and calculating three-dimensional coordinates of the pixel in the deformation region and the strain of the blade to determine and locate the structuralfailure of the blade. According to the structural fault detection method and the system for measuring the relative deformation of the wind turbine blade, the technical difficulty of the traditional digital image correlation technology method in matching the large rotation angle can be overcome, and it is suitable for the measurement of the rotating blade.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a structural fault detection method and system for measuring relative deformation of wind turbine blades. Background technique [0002] Various faults of wind turbine blades have obvious external manifestations when the stress state changes, for example, surface cracks open, internal defects make the surface bulge, etc. Many faults of wind turbine blades can only be manifested during the rotation of the blades. At present, the method of blade health detection and evaluation based on the measurement results of blade deformation parameters is based on the traditional DIC method. [0003] Digital Image Correlation (DIC) is a new type of advanced optical measurement technology based on modern digital image processing and analysis technology. It obtains the deformation (displacement and Strain) information, has the advantages of non-contact, low requirements on the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 张东升于起峰吴荣
Owner SHANGHAI UNIV
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