Phased array quantitative damage monitoring method, device and system

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...

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

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