Detection method of thick beam structure damage based on guide wave

A technology of damage detection and beam structure, applied in the field of detection, can solve the problems of complex Lamb waves, increase the complexity of signal processing and analysis, and achieve the effect of realizing damage monitoring and simple operation steps.

Inactive Publication Date: 2009-09-23
SHANGHAI JIAO TONG UNIV
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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)

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  • Detection method of thick beam structure damage based on guide wave
  • Detection method of thick beam structure damage based on guide wave
  • Detection method of thick beam structure damage based on guide wave

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Embodiment Construction

[0030] The embodiments of the present invention will be described in detail below with reference to the drawings: this embodiment is implemented on the premise of the technical solution of the invention, and detailed implementation modes and specific operation procedures are given, but the protection scope of the present invention is not limited to the following embodiments .

[0031] This embodiment adopts such as figure 2 Specimen shown. The test piece is a stainless steel beam with a size of 300mm×34mm×25mm. In order to demonstrate the principle and effect of the test, a total of three specimens were made, one of which was the reference specimen (without damage), and the other two specimens had incisions with different depths in the middle of the specimen, and the damage degree was 25 respectively. % And 50% (definition of damage degree: ratio h / d of notch depth h to beam thickness d). Three PZT transducers are arranged for each test piece, one is a vibration exciter, and the ...

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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

Technical field [0001] The invention relates to a method in the technical field of detection, in particular to a method for detecting damage to a thick beam structure based on a guided wave. Background technique [0002] With the development and progress of society, people have higher and higher requirements for production and life safety. The beam structure has a wide range of applications in the fields of civil engineering and heavy industry machinery, and it is often at a key position in the structural system. The health and safety status of the beam structure is very important to the entire structural system. Take the steel beam structure as an example. Due to defects in the production or structure of the steel beam structure, these defects are likely to become the origin of cracks. Generally speaking, after a crack is formed, the fatigue failure stage can be divided into two stages: crack growth and final fracture; the crack growth stage is slow and relatively hidden, and th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 孙凯李富才孟光叶林
Owner SHANGHAI JIAO TONG UNIV
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