A method for on-line monitoring of full-field three-dimensional deformation of wind turbine blades under working conditions

Abstract

The invention provides an on-line monitoring method of overall three-dimensional deformation of wind wheel blades in working states. The on-line monitoring method comprises the steps of selecting a wheel hub center as a fixed mark point, selecting another mark point at the root of each blade, and adopts marks in different shapes before a wind generator unit operates, obtaining overall three-dimensional coordinates of the wind wheel blades in static states with two digital cameras, when the wind generator unit operates, determining rigid body rotation angles of the wind wheel blades according to relative positions of the mark points in the working states and the static states, calculating to obtain the three-dimensional coordinates of the deformed wind wheel blades in the working states according to image plane coordinates after removing rigid body rotation displacement, and obtaining overall three-dimensional displacement values and strain values of the wind wheel blades in the working states according to differences of the three-dimensional coordinates before and after the deformation of the wind wheel blades. The method has the on-line, non-contact, overall and three-dimensional advantages and the like, can obtain overall three-dimensional displacement and strain of the wind wheel blades in the working states, and achieves monitoring of the deformation of the wind wheel blades in the working states.

Description

technical field [0001] The invention belongs to the field of full-field three-dimensional deformation measurement of structures, and in particular relates to an online monitoring method for full-field three-dimensional deformation of wind turbine blades in a working state. Background technique [0002] As the world's energy crisis becomes more and more serious, and the public's demand for improving the ecological environment is increasing, wind energy, as a clean and renewable energy source, is increasingly valued by governments. The wind power industry is gradually developing into a new industry that has begun to take shape. Due to strong wind, electric shock, corrosion and other factors, wind turbines may be damaged or even catastrophic during operation. Wind turbine blades are one of the key components of wind turbines. The quality of the blades directly affects the efficiency, life and performance of wind turbines. Therefore, the safety of wind turbine blades is extreme...

AI Technical Summary

Problems solved by technology

The research on the damage mechanism and damage identification of wind rotor blades often needs to measure the deformation field of the surface of the wind rotor blade under the action of wind load, but the traditional detection method is static detection, and the load applied in the test is higher than that of the wind rotor blade in actual work. The force is simple and cannot fully reflect the displacement and strain of the wind rotor blade under the complex force in the actual work, and the strain gauge, extensometer and other methods have limited range and can only measure the strain in a single direction, and the sensor may be damaged by the wind rotor blade. Difficulties and deficiencies such as damage and failure

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