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Wind turbine blade crack positioning method based on non-contact multi-point vibration measurement and Hilbert transformation

A technology of wind turbine blade and positioning method, which is applied in the processing of detected response signals, measurement devices, analysis of solids using sonic/ultrasonic/infrasonic waves, etc. The effect of structural damage sensitivity and accurate location of cracks

Active Publication Date: 2019-12-13
FOSHAN UNIVERSITY
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Problems solved by technology

[0008] The purpose of the present invention is to provide a wind turbine blade crack location method based on non-contact multi-point vibration measurement and Hilbert transform, to solve the problem of low positioning accuracy of the breathing crack position of the blade structure

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  • Wind turbine blade crack positioning method based on non-contact multi-point vibration measurement and Hilbert transformation
  • Wind turbine blade crack positioning method based on non-contact multi-point vibration measurement and Hilbert transformation
  • Wind turbine blade crack positioning method based on non-contact multi-point vibration measurement and Hilbert transformation

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[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] The purpose of the present invention is to provide a wind turbine blade crack location method based on non-contact multi-point vibration measurement and Hilbert transformation, which can improve the location accuracy of the blade crack location.

[0051] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with...

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Abstract

The invention discloses a wind turbine blade crack positioning method based on non-contact multi-point vibration measurement and Hilbert transformation. The method comprises a step of setting a plurality of position marking points on a blade with breathing cracks, exciting the blade by adopting a random signal excitation mode, and acquiring a nonlinear vibration signal of a position of each marking point of the blade under the condition of random signal excitation by utilizing a non-contact multi-point vibration measurement method, a step of calculating a frequency response function of the corresponding marking point position according to excitation input and output position vibration signals under the random signal excitation condition, a step of calculating Hilbert transformation of eachmarking point position according to a frequency response function under the random signal excitation condition, a step of calculating a cross-correlation index according to the frequency response function corresponding to each marking point and the Hilbert transform thereof, and a step of calculating a nonlinear degree value of each marking point position according to the cross-correlation indexand determining a crack position according to a normalized nonlinear degree value. By adopting the positioning method and system provided by the invention, the identification effect of a blade breathing crack position can be improved.

Description

technical field [0001] The invention relates to the field of blade structure breathing crack detection, in particular to a wind turbine blade crack location method and a non-contact measuring device based on non-contact multi-point vibration measurement and Hilbert transformation. Background technique [0002] With the development of disciplines such as computer science, artificial intelligence, and image processing, non-contact measurement technology has gradually become the most flexible and popular technology in the field of non-contact measurement, with the advantages of strong adaptability, wide measurement range, and multi-point measurement. [0003] The general vibration mode identification method is to obtain the free vibration response or impulse response of the structure by measuring the excitation and response signals, which is relatively easy for the laboratory model, but it is not easy for the health monitoring of the blade structure under the operating state of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/4472
Inventor 蒋勉邝应炜黄勇卢清华何宽芳
Owner FOSHAN UNIVERSITY
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