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Monitoring method for blade crack of wind driven generator

A technology for cracks in wind turbines and blades, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as uncertain monitoring results, decreased sensitivity or reliability of results, etc.

Inactive Publication Date: 2013-02-13
SHENYANG JIANZHU UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0005] In the past, many monitoring methods often needed to assume a health signal, but these health signals are not easy to determine in practice, and will often change with the growth of time or changes in the external environment, etc., which brings certain influence to the monitoring results. Uncertainty, resulting in reduced sensitivity or reliability of the results

Method used

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  • Monitoring method for blade crack of wind driven generator
  • Monitoring method for blade crack of wind driven generator
  • Monitoring method for blade crack of wind driven generator

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Embodiment Construction

[0025] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] The invention includes a health monitoring system for wind power generator blades, which is mainly composed of piezoelectric ceramic sensors, function transmitters, oscilloscopes and components to be tested. The system structure diagram is as follows figure 1 shown. Piezoelectric ceramic chips are arranged on the fan blades in the form of arrays as drivers and sensors, and are mainly used to transmit and collect signals; function generators are used as output devices for monitoring signals, and can provide various signal transmission functions according to actual needs ; The oscilloscope is used for real-time display and storage of monitoring signals.

[0027] The working principle of the piezoelectric ceramic fan crack damage health monitoring system of the present invention is realized based on the active monitoring technology ...

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Abstract

The invention provides a monitoring method for blade crack of a wind driven generator. The monitoring method mainly includes setup of a piezoelectric ceramic fan crack damage health monitoring system and a fan blade crack damage assessment method. The piezoelectric ceramic fan crack damage health monitoring system mainly comprises piezoelectric ceramic pieces, a function generator and an oscilloscope. The working principle is an active surveillance technology based on a piezoelectric ceramic wave method, and the working procedures include utilizing the function generator to emit sine sweeping-frequency signals and the oscilloscope is used for real-time display and storage for received detection signals. The fan blade crack damage assessment method includes utilizing Fourier spectrum analysis to calculate two defined damage indexes based on wavelet packet analysis, successfully monitoring crack areas and performing verification through time reversal. The monitoring method is easy to operate, and the identification effect of blade crack of the wind driven generator is remarkable. The monitoring method is general, and can be applied to damage monitoring of composite materials similar to fan blades.

Description

technical field [0001] The invention relates to the technical field of health monitoring of civil engineering structures, in particular to a method for monitoring cracks of blades of wind power generators. Background technique [0002] At present, wind energy is one of the renewable energy sources with the most development potential. With the rapid development of social industry, energy consumption is increasing day by day, while some non-renewable energy sources such as coal and oil are becoming increasingly exhausted. The development of renewable energy sources such as solar energy and wind energy It is highly valued and widely used all over the world. Among them, wind energy is the new energy with the most development conditions and prospects among renewable energy sources, and wind power generation is one of the most important ways to develop wind energy. Wind turbine blades are the most important and expensive components in the entire wind turbine system. The cost of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 阎石吴晓旸孙威
Owner SHENYANG JIANZHU UNIVERSITY
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