Method for quantizing transverse cracks on surface of fan spindle by utilizing spindle center hole position excitation ultrasonic waves

Abstract

The invention discloses a method for quantizing transverse cracks on the surface of a fan spindle by utilizing spindle center hole position excitation ultrasonic waves, which comprises the following steps of: arranging an electromagnetic sound excitation sensor and an electromagnetic sound receiving sensor on the inner wall of a spindle center hole, exciting ultrasonic transverse waves by the excitation sensor, and receiving crack reflection transverse waves at the same time, wherein the receiving sensor is used for receiving crack diffraction transverse waves. and determining a circular trajectory of an excitation point through the transit time of reflected echoes, and determining the position of a crack opening by intersecting the circular trajectory with a circumferential tangent line. Meanwhile, determining an elliptical orbit of a transverse wave diffraction point by utilizing the position of the excitation sensor, the position of the electromagnetic acoustic sensor and the transit time of the diffracted transverse wave, and substituting the axial coordinate of the opening position into an elliptical orbit equation to determine the tip position, so that the quantitative characterization of the axial position and the expansion depth of the surface opening transverse crack is realized.

Description

technical field [0001] The invention relates to an ultrasonic quantitative detection method for opening transverse cracks on the main shaft surface of an in-service wind power generator, belonging to the field of non-destructive testing. Background technique [0002] Wind power has become the third largest power source in my country, and its proportion in the national power source structure has been increasing year by year. The operation status of wind turbines is closely related to national energy security. The main shaft of the wind turbine is the core component of the transmission system of the wind turbine, and its structural health directly affects the operation safety of the wind turbine. The main shaft of the fan not only has a harsh service environment, but also has very complicated working conditions. It has been subjected to complex stresses such as torque, axial thrust and aerodynamic bending moment for a long time. During the long-term operation of the main shaf...

AI Technical Summary

Problems solved by technology

This method can solve the problem of difficult quantification of transverse crack detection on the spindle end face, and can achieve the purpose of accurate measurement of crack position and extension depth

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