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Impact monitoring and positioning method based on two-dimensional beam focusing theory

A technology of beam focusing and positioning method, which is applied in impact testing, aircraft health monitoring devices, testing of machine/structural components, etc., can solve the problems of positioning blind spots and low positioning accuracy, achieve complete impact monitoring, improve positioning accuracy, and greatly Effects of Scope High Accuracy Shock Monitoring

Active Publication Date: 2020-04-17
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a shock monitoring and positioning method based on the two-dimensional beam focusing theory, which solves the problems of positioning blind spots and relatively low positioning accuracy in the existing one-dimensional beam focusing positioning method

Method used

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  • Impact monitoring and positioning method based on two-dimensional beam focusing theory
  • Impact monitoring and positioning method based on two-dimensional beam focusing theory
  • Impact monitoring and positioning method based on two-dimensional beam focusing theory

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Experimental program
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Embodiment

[0075] The impact test at point (20,20) has:

[0076] Use the data acquisition card to send the collected impact signal to the host computer, such as Figure 7 Shown; Fourier transform it to get the frequency spectrum as Figure 8 It can be seen from the signal spectrogram that the main energy distribution of the signal is between 0-80kHz, and the energy is most concentrated between 20-40KHz, so this paper uses 30kHz as the center frequency of the signal to perform time-varying window analysis on the signal using Gabor wavelet to extract features value. After Gabor wavelet transform, take its envelope as Figure 9 As shown, it can be clearly seen that each signal has a time delay. At this time, the cross-correlation algorithm is used to process the signal, and two signals in PZT 2–4 after wavelet transformation and PZT 1 signal are respectively taken, and the cross-correlation processing is carried out by formula (2) to obtain the cross-correlation signal of the two signals...

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Abstract

The invention discloses an impact monitoring and positioning method based on a two-dimensional beam focusing theory. The method specifically comprises the following steps: 1, monitoring a signal whena structure is impacted by adopting a piezoelectric sensor; sending the acquired impact signal to an upper computer by using a data acquisition card, performing Fourier transform on the impact signalin the upper computer to obtain a signal spectrogram, selecting a frequency peak value of the spectrogram as a center frequency to perform wavelet analysis on the signal to obtain a time domain signalcorresponding to the center frequency, and enveloping the obtained time domain signal; 2, solving the position of an impact point by using a two-dimensional beam focusing positioning method, and judging whether the impact point is in an external field or not; and 3, if the positioning coordinates are not in the external field, considering that the positioning result is located in a blind area ofthe internal field two-dimensional beam focusing positioning method, solving the positioning coordinates (a, b) again, and outputting the positioning coordinates as a final positioning result. According to the invention, the problems of positioning dead zones and low positioning precision of the existing one-dimensional beam focusing positioning are solved.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, and relates to a shock monitoring and positioning method based on a two-dimensional beam focusing theory. Background technique [0002] Impact damage is one of the main structural damage forms that affect the safe operation of aircraft. Most of them are caused by bird strikes, splashing of gravel during take-off, and falling of maintenance tools. Due to low-speed impact, it is easy to cause matrix damage inside the structure that cannot be detected by the naked eye. This kind of hidden damage is extremely harmful to the performance of the material. During the operation of the structure, it is easy to generate stress concentration, which will lead to structural failure, and then lead to flight accidents. Therefore, it is very necessary to detect the impact damage, and to find out the position of the impact in time can focus on the detection of this area to ensure the safety of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/08G01H11/08B64D45/00
CPCB64D45/00B64D2045/0085G01H11/08G01M7/08
Inventor 常琦孟瑶杨维希刘君
Owner XIAN UNIV OF TECH
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