Phased array quantitative damage monitoring method, phased array quantitative damage monitoring device and phased array quantitative damage monitoring system

Abstract

The invention provides a phased array quantitative damage monitoring method, a phased array quantitative damage monitoring device and a phased array quantitative damage monitoring system. The method comprises the steps of acquiring Lamb wave sensing signals of piezoelectric wafer pairs of piezoelectric close-packed array in a tested structure; acquiring the damage scattering signals of the piezoelectric wafer pairs; carrying out frequency domain beam forming processing on the damage scattering signals to obtain a beam forming signal frequency spectrum of scanning angles; carrying out the frequency dispersion compensating processing on the beam forming signal frequency spectrum by a frequency dispersion compensating algorithm based on wave form correcting to obtain the compensated beam forming signals of the scanning angles; carrying out damage imaging by utilizing beam forming signals to obtain an imaging result; and extracting the damage information of the tested structure in the imaging result. According to the method, the influence on the beam forming process caused by the frequency dispersion effect can be eliminated, the distortion of the wave forms of the beam forming signals subjected to the frequency dispersion compensating can be avoided, the signal interpretation and the subsequent phased array high-resolution damage imaging are convenient, and further, two damage information, namely the damage position and the degree of severity can be given in a quantification manner.

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

Images