Detection method of thick beam structure damage based on guide wave

Abstract

The invention provides a detection method of thick beam structure damage based on guide wave, comprising the following steps: arrangement of transducer, arrangement of excitation signal, generation, spread and collection of the excitation signal, and signal processing and analysis, and damage identification. Owing to the reasonable arrangement of an exciter and a sensor and appropriate arrangement of the excitation signal, damage waveform signal of a thick beam object in a project can be collected. Besides, information indicating position and degree of damage can be obtained by waveform extraction and analysis, thus realizing sound monitoring and the damage detection of thick beam.

Description

Damage detection method for thick beam structures based on guided waves technical field The invention relates to a method in the technical field of detection, in particular to a method for detecting damage of thick beam structures based on guided waves. Background technique With the development and progress of society, people have higher and higher requirements for production and life safety. Beam structures are widely used in civil engineering and heavy machinery, and often play a key role in structural systems. The health and safety of the beam structure is critical to the entire structural system. Taking the steel beam structure as an example, the steel beam structure has defects in production or structure, and these defects are easy to become the origin of cracks. Generally speaking, after a crack is formed, its fatigue failure stage can be divided into two stages: crack propagation and final fracture; the crack propagation stage is slow and relatively hidden, while ...

AI Technical Summary

Problems solved by technology

However, because the Lamb wave becomes more complex with the increase of the product of thickness and excitation frequency: more and more modes are generated, which increases the complexity of signal processing and analysis, so this type of research usually focuses on the plate structure (the plate thickness is much smaller than the wavelength , often no more than 10mm thick)

Images