Method, device and apparatus for calibrating fiber grating sensor of fan blade

Abstract

Provided are a method, device and equipment for calibrating fiber grating sensors of fan blades. A fan includes a plurality of a plurality of blades, each blade is equipped with a plurality of fiber grating sensor, for each blade, the method includes collecting data which at least include a plurality of pitch angles of the blade and a plurality of wavelengths of each fiber grating sensor installedon the blade at each pitch angle; converting the collected wavelength into actual strain according to a function containing an undetermined initial wavelength; calculating theoretical bending momentof blade roots according to the pitch angles of the blades; converting the theoretical bending moment into theoretical strain according of a function containing the undetermined rigidity coefficient;and taking the theoretical strain and actual strain being the closest according to pre-designated rules as a condition, obtaining the undetermined rigidity coefficient and undetermined initial wavelength.

Description

technical field [0001] The present disclosure relates generally to load fiber grating sensors, and more particularly, to methods and apparatus for calibrating fiber grating sensors. Background technique [0002] In recent years, with the increase in the development and installation of wind power generation units, on the one hand, a large number of application requirements have been put forward for the units and wind farms, such as: tapping the potential of wind farms, increasing power generation, reducing unit cost of electricity (COE), and generating units Reducing load and prolonging life, handling major faults, improving unit reliability and intelligent control applications of units, etc., require more accurate testing requirements; on the other hand, the traditional single electrical measurement method is not accurate enough and has weak anti-electromagnetic interference ability , low reliability and stability, and short service life cannot meet the testing and evaluatio...

AI Technical Summary

Problems solved by technology

Although fiber grating sensors have developed rapidly and are widely used in recent years, so far, there is no specific method for calibrating fiber grating sensors for wind turbine blade root loads in the domestic market

[0004] The existing calibration methods need to calibrate the initial wavelength and stiffness coefficient separately, and when calibrating different blades, repeated operations are required, that is, only one blade can be calibrated at a time, and multiple changes are required when calibrating one blade. Paddle operation, the process is troublesome

In addition, when using existing methods for calibration, it is necessary to additionally consider the influence of cross-talk

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