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Defect location method for sheet metal based on active sweep frequency acoustic excitation

A technology of metal thin plate and positioning method, which is applied in the detection of response signals, the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, and the use of sound waves/ultrasonic waves/infrasonic waves for material analysis, etc. It can solve problems such as positioning errors and positioning errors, and achieve accuracy sex high effect

Active Publication Date: 2021-04-27
CHONGQING UNIV
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Problems solved by technology

However, in the actual defect location process, due to various reasons, when there are many unknown parameters of the measured metal sheet conditions, for the traditional defect location method based on time delay estimation, if the theoretical formula or empirical formula of guided wave dispersion equation in the plate is directly used Guided wave velocity to locate the defect will lead to a large positioning error or positioning error

Method used

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  • Defect location method for sheet metal based on active sweep frequency acoustic excitation
  • Defect location method for sheet metal based on active sweep frequency acoustic excitation
  • Defect location method for sheet metal based on active sweep frequency acoustic excitation

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Embodiment Construction

[0028] A thin metal sheet defect location method based on active sweeping acoustic excitation, the innovation of which is that the method includes:

[0029] 1) Device layout: multiple piezoelectric ceramic sensors are arranged on the surface of the metal sheet to be tested, and the multiple piezoelectric ceramic sensors are distributed in a ring, and the area surrounded by multiple piezoelectric ceramic sensors forms a detection area; A dynamic actuator, the actuating actuator is located in the middle of the detection area; the surface of the metal sheet to be tested is used as the coordinate plane to establish a two-dimensional rectangular coordinate system to obtain the coordinates of each piezoelectric ceramic sensor in the two-dimensional rectangular coordinate system;

[0030] 2) Signal acquisition: control the actuation exciter to apply a frequency sweep excitation signal to the metal sheet to be tested, and at the same time, obtain detection signals through multiple piez...

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Abstract

The present invention proposes a metal sheet defect location method based on active sweep frequency acoustic excitation, said method includes four steps: device layout, signal acquisition, signal processing, and defect location; the method can obtain defect position curves through time delay information , and then determine the defect position according to the intersection point of the defect position curve; the beneficial technical effect of the present invention is: a metal sheet defect location method based on active sweep frequency acoustic excitation is proposed, which can be realized without knowing the propagation velocity of the guided wave in advance Defect location, the positioning accuracy is high.

Description

technical field [0001] The present invention relates to a metal sheet defect location technology, in particular to a metal sheet defect location method based on active frequency-sweeping acoustic excitation, which can realize defect location without knowing the propagation velocity of guided waves in advance. Background technique [0002] After long-term use, large-scale building structures, on-site equipment or materials will be affected by adverse factors such as environmental erosion, structural aging, fatigue effects, etc., and are prone to structural damage, resulting in a decline in durability and reliability, directly affecting the safety of national life and property and The production quality of industrial products; it is imperative to introduce health monitoring methods to detect and evaluate potential damage conditions in the structure to ensure that the structure is in a safe working state. [0003] Nondestructive testing, as a means to detect damage in the struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/42
CPCG01N29/045G01N29/42G01N2291/0234G01N2291/0289G01N2291/103
Inventor 杨进沈子莹
Owner CHONGQING UNIV
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