Video measurement method for large-scale wind power blade movement tracking

Abstract

The present invention relates to a video measurement method for large-scale wind power blade movement tracking. The method comprises the steps of: spraying a random speckle patterns and pasting orienteering reflect light mark points; dividing the surface of the blade into a plurality of measurement areas, wherein different measurement areas put corresponding camera sets; performing camera calibration; controlling each camera to simultaneously collect mages when the large-scale wind power blade is rotated; after rotation correction according to the collected speckle patterns, performing analysis of each image collected by each camera, calculating center coordinates of the reflect light mark points, and performing multi-pole matching of related points in each image collected by each camera;performing three-dimensional reconstruction according to the collected images and results of multi-pole matching, obtaining three-dimensional coordinates of each point on the large-scale wind power blade, analyzing the change conditions of the orienteering reflect light mark points on the large-scale wind power blade in the deformation process, and obtaining the deformation of surface key points of the large-scale wind power blade. The video measurement method for large-scale wind power blade movement tracking can accurately obtain the space coordinates of any position of the feature surface in each state to achieve the purposes of tracking and movement measurement.

Description

technical field [0001] The disclosure relates to motion tracking and deformation measurement of large wind blades in the field of three-dimensional measurement, and in particular to a video measurement method for motion tracking of large wind blades. Background technique [0002] Large-scale wind blades are elastic body structures with short span and long chords. As the main load-bearing parts of wind turbines, almost all the force must be transmitted through the blades. The blades are bound to be prone to vibration and deformation, which will affect the performance of wind turbines It runs smoothly, and it will cause damage to the wind turbine in severe cases. However, the contact sensors commonly used at this stage are difficult to effectively cope with this measurement requirement. On the one hand, due to the problem of lead wires, the sensor is not easy to arrange on large or high-speed rotating blades; on the other hand, the observation points established by the sensor...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of large torque or high-speed rotation in the measurement conditions of large wind blades, there is a problem of weak image correlation when using ordinary matte marker points for measurement. Direct image matching through marker points may not find the before and after deformation. Similar subregions of , resulting in matching failure

Existing binocular video measurement only considers two images when performing relevant point matching, which is prone to ambiguity, that is, multiple image points will be selected as corresponding image points when searching along a certain epipolar line

Moreover, the binocular video measurement system is only suitable for sparse and scattered coding points, and the measurement effect is not ideal for densely arranged non-coding points, such as figure 1 shown

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