CN-122017025-A - Fan blade flaw detection method, device and medium

CN122017025ACN 122017025 ACN122017025 ACN 122017025ACN-122017025-A

Abstract

The invention discloses a fan blade flaw detection method, device and medium, which comprise the steps of obtaining size data of a fan blade, transmitting ultrasonic waves to the fan blade at a certain detection position according to a preset scanning route, receiving ultrasonic echoes of the fan blade, determining whether damage exists on the fan blade according to the ultrasonic waves and the ultrasonic echoes, if yes, determining the damage type according to the ultrasonic echoes, determining the damage position according to the detection position and the size data, and continuously transmitting the ultrasonic waves to the fan blade at the next detection position according to the preset scanning route. The invention can complete automatic flaw detection, greatly reduce the risk of serious damage to the fan blade and ensure the safety of fan operators and fan equipment.

Inventors

Gui Xuanjiang
LI XIAOQING
LIN SHENG
HUANG ZHONGQI
LIAN CHAOFAN
WU TAO
LIN JUNWEI

Assignees

长江三峡集团福建能源投资有限公司
漳浦海峡发电有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. The fan blade flaw detection method is applied to a fan blade and is characterized by comprising the following steps of: acquiring size data of the fan blade; Transmitting ultrasonic waves to the fan blade at a certain detection position according to a preset scanning route, and receiving ultrasonic echoes of the fan blade; Determining whether the fan blade is damaged or not according to the ultrasonic waves and the ultrasonic echo; if yes, determining the damage type according to the ultrasonic echo, determining the damage position according to the detection position and the size data, and continuously transmitting ultrasonic waves to the fan blade at the next detection position according to a preset scanning route.
2. The method of claim 1, wherein the transmitting ultrasonic waves to the fan blade at a detection position along a preset scanning route, and receiving ultrasonic echoes from the fan blade comprises: establishing a coordinate system by taking the center of a root center circle of the fan blade as an origin; And taking the root of the fan blade as a starting point, along the center line of the fan blade towards the tip direction, keeping the distance between the vertical direction and the fan blade at a preset distance height, and transmitting ultrasonic waves to the fan blade.
3. The method of claim 1, wherein said determining whether there is damage to said fan blade based on said ultrasonic waves and said ultrasonic echoes comprises: Determining whether the difference value between the peak height of the ultrasonic wave and the peak height of the ultrasonic echo is smaller than a preset peak height threshold value, if not, determining that the fan blade is damaged, and if so, not, determining that the fan blade is damaged.
4. A method of inspecting a fan blade according to claim 3, wherein said determining whether there is damage to said fan blade based on said ultrasonic waves and said ultrasonic echoes further comprises: After determining that the difference value between the peak height of the ultrasonic wave and the peak height of the ultrasonic echo is not smaller than a preset peak height threshold value, filtering the ultrasonic echo, and determining the waveform duration of the ultrasonic echo; determining whether the difference between the waveform duration of the ultrasonic wave and the waveform duration of the ultrasonic echo is smaller than a preset time difference threshold, if so, determining that the fan blade is not damaged, otherwise, determining that the fan blade is damaged.
5. The method for inspecting a fan blade according to claim 4, further comprising: After the damage of the fan blade is determined, determining the longitudinal wave velocity of the ultrasonic echo in the fan blade according to the density of the fan blade and the Young modulus of the fan blade; determining the distance height as a peak height of the ultrasonic wave; and determining the peak height of the ultrasonic echo according to the wavelength duration time of the ultrasonic echo, the longitudinal wave velocity and the distance height.
6. The method of claim 4, wherein said determining the type of damage from said ultrasonic echoes comprises: after the damage of the fan blade is determined, respectively transmitting a first ultrasonic wave and a second ultrasonic wave to the fan blade at the detection position, and respectively receiving a first ultrasonic echo corresponding to the first ultrasonic wave and a second ultrasonic echo corresponding to the second ultrasonic wave, wherein the ultrasonic wave with the transmission frequency of a first transmission frequency is the first ultrasonic echo, and the ultrasonic wave with the transmission frequency of a second transmission frequency is the second ultrasonic wave; respectively determining the peak height of the first ultrasonic echo and the peak height of the second ultrasonic echo; And determining the damage type according to the peak height of the ultrasonic echo, the peak height of the first ultrasonic echo and the peak height of the second ultrasonic echo.
7. The method of claim 6, wherein said determining said type of damage based on said peak height of said ultrasonic echo, said peak height of said first ultrasonic echo, and said peak height of said second ultrasonic echo comprises: Respectively determining the ratio of the peak heights of the ultrasonic echo, the first ultrasonic echo and the second ultrasonic echo to the corresponding ultrasonic wave transmitting frequencies, wherein the ratio comprises an initial ratio, a first ratio and a second ratio; if the initial ratio is greater than the first ratio and less than the second ratio, determining that the damage type is a blade expansion damage; and if the first ratio and the second ratio are both larger than the initial ratio, determining that the damage type is blade damage.
8. The method for inspecting a fan blade according to claim 1, further comprising: determining a first detection position corresponding to the damage of the fan blade for the first time and a second detection position corresponding to the damage of the fan blade for the last time; Obtaining the damaged surface area and the damaged volume corresponding to the first detection position and the second detection position according to the first detection position and the second detection position; the degree of damage is determined according to the surface area and the volume of the damage.
9. A fan blade inspection apparatus for performing the method of any one of claims 1 to 8, comprising: the blade ultrasonic device comprises a blade ultrasonic module, an ultrasonic echo receiving module, an echo signal processing module and a blade damage evaluation module; The blade ultrasonic module is used for transmitting ultrasonic waves to the fan blade at a certain detection position according to a preset scanning route; The ultrasonic echo receiving module is used for receiving ultrasonic echoes of the fan blade; The echo signal processing module is respectively connected with the blade ultrasonic module, the ultrasonic echo receiving module and the blade damage evaluation module and is used for acquiring the size data of the fan blade; The blade damage evaluation module is used for determining the damage type according to the ultrasonic echo and determining the damage position according to the detection position and the size data.
10. A storage medium having stored thereon computer-executable instructions, the computer executable instructions are for performing the method of any one of claims 1 to 8.

Description

Fan blade flaw detection method, device and medium Technical Field The invention relates to the field of wind power equipment, in particular to a method, a device and a medium for detecting a flaw of a fan blade. Background The key component of the wind turbine generator system, namely the blades, is exposed in a severe natural environment for a long time, and is subjected to huge mechanical stress and environmental erosion during operation, so that the inspection and maintenance of the blades become an important ring for guaranteeing the normal and reliable operation of the wind turbine generator system. However, the currently commonly adopted manual boarding visual inspection method cannot realize the inspection of the blade tip part, the inspection quality is influenced by the technical maturity and the operation time of personnel, the accurate inspection of the damage defects in the blade cannot be realized, the space of the blade is limited, the working environment has the risk of hypoxia or even toxicity, the blade inspection work is usually carried out by a plurality of people, the working time is long, and the working danger is high. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a fan blade flaw detection method which can complete automatic flaw detection, greatly reduce the risk of serious damage to the fan blade and ensure the safety of fan operators and fan equipment. The invention also provides a device and a medium with the fan blade flaw detection method. According to an embodiment of the first aspect of the invention, a fan blade flaw detection method is applied to a fan blade and comprises the following steps: acquiring size data of the fan blade; Transmitting ultrasonic waves to the fan blade at a certain detection position according to a preset scanning route, and receiving ultrasonic echoes of the fan blade; Determining whether the fan blade is damaged or not according to the ultrasonic waves and the ultrasonic echo; if yes, determining the damage type according to the ultrasonic echo, determining the damage position according to the detection position and the size data, and continuously transmitting ultrasonic waves to the fan blade at the next detection position according to a preset scanning route. The fan blade flaw detection method has the advantages that firstly, the fan blade is scanned according to the preset scanning route, the damage condition of the fan blade is determined according to the scanning result, namely the ultrasonic echo, if the damage is determined, the damage type is determined according to the ultrasonic echo, and the damage position is determined according to the current detection position, so that complete automatic flaw detection is completed, corresponding early warning and emergency operation are conveniently carried out in time, the risk of serious damage to the fan blade is greatly reduced, and the safety of fan operators and fan equipment is ensured. According to some embodiments of the invention, the transmitting ultrasonic waves to the fan blade at a detection position along a preset scanning route, and receiving ultrasonic echoes of the fan blade includes: establishing a coordinate system by taking the center of a root center circle of the fan blade as an origin; And taking the root of the fan blade as a starting point, along the center line of the fan blade towards the tip direction, keeping the distance between the vertical direction and the fan blade at a preset distance height, and transmitting ultrasonic waves to the fan blade. According to some embodiments of the invention, the determining whether there is damage to the fan blade based on the ultrasonic waves, the ultrasonic echoes, comprises: Determining whether the difference value between the peak height of the ultrasonic wave and the peak height of the ultrasonic echo is smaller than a preset peak height threshold value, if not, determining that the fan blade is damaged, and if so, not, determining that the fan blade is damaged. According to some embodiments of the invention, the determining whether there is damage to the fan blade according to the ultrasonic wave and the ultrasonic echo further comprises: After determining that the difference value between the peak height of the ultrasonic wave and the peak height of the ultrasonic echo is not smaller than a preset peak height threshold value, filtering the ultrasonic echo, and determining the waveform duration of the ultrasonic echo; determining whether the difference between the waveform duration of the ultrasonic wave and the waveform duration of the ultrasonic echo is smaller than a preset time difference threshold, if so, determining that the fan blade is not damaged, otherwise, determining that the fan blade is damaged. According to some embodiments of the invention, further comprising: After the damage of the fan blade is