Method for actively monitoring damage of engineering structure excited by adopting synthesis wave front

Abstract

The invention discloses a method for actively monitoring the damage of an engineering structure excited by adopting a synthesis wave front, comprising the following steps of: collecting Lamb wave standard response signals of all exciting / sensing channels of the structure in a healthy state; collecting Lamb wave standard response signals of all the exciting / sensing channels of the structure in a damaged state; extracting Lamb wave damage scattered signals of all the exciting / sensing channels under the excitation of the synthesis wave front; obtaining the position and the range of damage according to the damage scattered signals so as to analyze and judge the health condition of a detected structure. An arc sensor / exciter array technology is adopted in the method, and an excitation signal in the structure is enhanced by adopting a synthesis wave front method based on the condition of the traditional structure damage monitoring equipment, thus, the energy of the damage scattered signals is increased, and the accuracy and the stability of a monitoring system are improved.

Description

technical field [0001] The invention relates to a method for active Lamb wave damage monitoring of plate engineering structures, in particular to an active Lamb wave engineering structure damage monitoring method based on arc-shaped piezoelectric arrays and synthetic wave fronts. Background technique [0002] With the continuous improvement of structural safety and reliability requirements, the on-line monitoring and diagnosis of structural damage has attracted more and more attention. In order to prevent disasters or losses caused by structural damage, effective monitoring of structures is necessary. [0003] On-line monitoring of structural damage requires related signal generation and acquisition equipment to have the characteristics of small size and low power consumption, and the monitoring must have high accuracy and real-time performance. The damage monitoring of plate structures generally adopts the method of active Lamb wave, and the monitoring is mainly realized ...

AI Technical Summary

Problems solved by technology

However, due to the particularity of Lamb wave propagation, the above methods still have certain problems in the application process. For example, the phased array technology is based on the far-field theory, while the active Lamb wave monitoring technology does not meet this point. At the same time, a single line array cannot Distinguishes which side of the line array the damage is on, and the time-reversal method has so far been unable to achieve physical focusing of the Lamb wave damage-scattering signal

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