Engineering structure damage assessment method of actively and passively monitoring information fusion by Lamb waves

Abstract

The invention discloses an engineering structure damage assessment method of actively and passively monitoring information fusion by Lamb waves. The method comprises the following steps: arranging a rectangular excitation / sensing array on a structure to be detected; building a monitoring passage, collecting Lamb wave response signals of all excitation / sensing paths, and calculating a contrast positioning imaging matrix of impact damage through an Lamb wave active and passive monitoring method; and fusing active and passive positioning imaging information to obtain a new positioning imaging matrix, reconstructing positions of the impact damage in the structure to be detected, and acquiring damage extension information. The method can be used to realize quantitative assessment and extension monitoring on damage through the advantage of capability of fusing passively monitored damage positioning points and an active monitoring damage range.

Description

technical field [0001] The invention relates to an engineering structure damage assessment method based on Lamb wave active and passive monitoring information fusion, in particular to a plate and shell engineering structure damage assessment method. Background technique [0002] With the continuous improvement of structural safety and reliability requirements, the detection and diagnosis of structural damage has attracted more and more attention, especially for the monitoring of impact damage and the detection of damage range. In order to prevent disasters or losses caused by structural damage, full-time monitoring of the structure and effective and rapid damage detection and repair must be carried out. [0003] The existing Lamb wave structural health monitoring technology utilizes the characteristic that the Lamb wave propagating in the plate structure is sensitive to micro-damage, and adopts technologies such as piezoelectric array technology and advanced signal analysis ...

AI Technical Summary

Problems solved by technology

The Lamb active-passive method has its technical advantages in all stages of damage development: the passive method can continuously monitor the structure online in real time, monitor the location of the impact at the first time, and accurately locate the coordinates of the impact point. However, it is difficult to monitor the inherent damage and cannot effectively monitor the damage development process; the active method can scan the structure multiple times, determine the damage range of the inherent damage, and monitor the damage development through multiple scans Trend Because it is monitored by the damage scattering signal, the scattering signal is scattered at the boundary of the damage area, so the active method is more sensitive to its area monitoring, but not sensitive to the original location of the damage

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