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Phased array quantitative damage monitoring method, device and system

A damage monitoring and phased array technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, and can solve the problems of beamforming signal waveform distortion, difficulty in signal analysis and interpretation, and consistent initial phase of wave packets.

Active Publication Date: 2018-05-22
BEIJING AERONAUTIC SCI & TECH RES INST OF COMAC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of the above-mentioned first method is that: using the time-distance domain mapping dispersion compensation method, it is easy to cause the waveform of the beamforming signal to be distorted, which makes it difficult for subsequent signal analysis and interpretation
[0008] Although the above-mentioned second method can restore the envelope shape of the wave packet in each scattered signal, it cannot keep the initial phase inside the wave packet consistent. When the monitoring range is expanded, this phase inconsistency will not be ignored, thereby reducing the subsequent time. Accuracy of Domain Beamforming
Moreover, current phased array damage monitoring methods generally only provide imaging results, and less quantitative information such as damage location and severity

Method used

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Embodiment 1

[0047] see figure 1 , is a schematic flowchart of a phased array quantitative damage monitoring method provided in Embodiment 1 of the present invention. The method of the embodiment of the present invention can be executed by a phased array quantitative damage monitoring device configured with hardware and / or software, and the implementation device can be configured to include a piezoelectric dense array corresponding to the structure under test and signal generation and acquisition. In the phased array quantitative damage monitoring system of the device.

[0048]Taking the phased array quantitative monitoring of cracks in the aluminum plate structure as an example, the method of the embodiment of the present invention will be described. However, the structure to be tested in this embodiment is not limited to the aluminum plate structure in the example.

[0049] Firstly, the tested structure is introduced. It is a 2024 aluminum plate structure commonly used in aircraft, wit...

Embodiment 2

[0104] see Figure 15 , is a schematic structural diagram of a phased array quantitative damage monitoring device provided in Embodiment 2 of the present invention. The device includes: a signal acquisition module 210 , a beam synthesis processing module 220 and a damage identification module 230 .

[0105] Wherein, the signal collection module 210 is used to collect the Lamb wave sensing signals of each pair of piezoelectric sheets of the piezoelectric ensemble arranged in the structure under test.

[0106] Specifically, the signal acquisition module 210 can realize the acquisition of Lamb wave sensing signals through the piezoelectric dense array corresponding to the signal generator and the structure under test. That is, through the signal generation and acquisition device, an excitation signal is applied to the piezoelectric sheet as the exciter in the pair of piezoelectric sheets contained in the piezoelectric ensemble corresponding to the structure under test, and each ...

Embodiment 3

[0141] see Figure 16 , is a schematic structural diagram of a phased array quantitative damage monitoring system provided in Embodiment 3 of the present invention. The system includes: a piezoelectric dense array 310 and a signal generator and collector 320 corresponding to the structure to be tested, and also includes: a phased array quantitative damage monitoring device 330 provided by any embodiment of the present invention.

[0142] Specifically, the phased array quantitative damage monitoring device 330 can collect the Lamb wave of each piezoelectric sheet pair of the piezoelectric ensemble arranged in the structure under test through the piezoelectric ensemble corresponding to the collector and the structure under test. sensing signal.

[0143] In the above solution, the signal generating and collecting unit 320 may specifically include: a signal generating unit, a power amplifying unit, a multiplexing unit, a signal conditioning unit, and a signal collecting unit.

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Abstract

The invention provides a phased array quantitative damage monitoring method, device and system. The method includes: collecting the Lamb wave sensing signals of each pair of piezoelectric sheets of the piezoelectric dense array arranged in the structure under test; obtaining the damage scattering signals of each pair of piezoelectric sheets; performing frequency-domain beamforming processing on the damage scattering signals to obtain The spectrum of the beamforming signal at each scanning angle; the dispersion compensation algorithm based on the waveform correction performs dispersion compensation processing on the spectrum of the beamforming signal to obtain the beamforming signal after compensation at each scanning angle; the damage imaging is obtained by using the beamforming signal Imaging results; extract damage information of the measured structure from the imaging results. The invention not only eliminates the influence of the dispersion effect on the beamforming process, but also avoids the distortion of the beamforming signal waveform after dispersion compensation processing, which is convenient for signal interpretation and subsequent phased array high-resolution damage imaging, and can be further quantified to Two kinds of damage information, including damage location and severity, are displayed.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of structural health monitoring, in particular to a phased array quantitative damage monitoring method, device and system. Background technique [0002] With the increasing requirements for structural safety and reliability, structural health monitoring has gradually received attention. The phased array damage monitoring method uses the beam-synthesized Lamb wave monitoring signals at various scanning angles to quickly perform large-area virtual omnidirectional scanning imaging on the structure and provide structural damage information, which has attracted extensive attention from damage monitoring researchers. [0003] However, in the actual application of phased array damage monitoring, the dispersion characteristics of Lamb waves can easily expand and deform the signal waveform, which seriously affects the phased array beamforming process and reduces the accuracy and resolution of ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
Inventor 蔡建卿新林袁慎芳鲁明宇高丽敏
Owner BEIJING AERONAUTIC SCI & TECH RES INST OF COMAC
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