A Shock Monitoring and Locating 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 problems such as low positioning accuracy and positioning blind spots, achieve complete impact monitoring, improve positioning accuracy, and greatly Effects of Scope High Accuracy Shock Monitoring

Active Publication Date: 2021-10-22
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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  • A Shock Monitoring and Locating Method Based on Two-Dimensional Beam Focusing Theory
  • A Shock Monitoring and Locating Method Based on Two-Dimensional Beam Focusing Theory
  • A Shock Monitoring and Locating Method Based on Two-Dimensional Beam Focusing Theory

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Experimental program
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Effect test

Embodiment

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

[0076] Use the data acquisition card to send the collected shock signal to the host computer, such as Figure 7 shown; Fourier transform is performed on it to obtain the spectrogram as shown in Figure 8 It can be seen from the signal spectrogram that the main energy of the signal is distributed in 0-80kHz, and the energy is most concentrated between 20-40KHz, so this paper uses 30kHz as the center frequency of the signal to use Gabor wavelet to analyze and extract features. value. After Gabor wavelet transform, take its upper 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, respectively taking one signal in the PZT2–4 after wavelet transformation and the PZT 1 signal, a total of two signals, and using formula (2) to perform cross-correlation processing to obtain the cross-correlation signal of the two signals as...

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Abstract

The invention discloses a shock monitoring and positioning method based on two-dimensional beam focusing theory, which specifically includes the following steps: step 1, using a piezoelectric sensor to monitor the signal when the structure is struck, and using a data acquisition card to collect the shock signal Send it to the host computer, perform Fourier transform on the impact signal in the host computer to obtain the signal spectrum, select the frequency peak of the spectrum as the center frequency to perform wavelet analysis on the signal, obtain the time domain signal corresponding to the center frequency, and analyze the obtained time domain Signal envelope; step 2, use the two-dimensional beam focusing positioning method to find the location of the impact point, and determine whether it is in the outer field; step 3, if the positioning coordinates are not in the outer field, consider that the positioning result is located in the inner field two-dimensional beam focusing positioning In the blind area of ​​the method, the positioning coordinates (a, b) are recalculated and output as the final positioning result. The invention solves the problems of positioning blind area and relatively low positioning accuracy existing in the existing one-dimensional beam focusing positioning.

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 Patents(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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