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Carrier modulation nonlinear ultrasonic guided wave damage detection method

A non-linear ultrasonic and damage detection technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, processing response signals of detection, instruments, etc., can solve problems such as affecting accuracy, achieve accurate detection, and reduce costs.

Active Publication Date: 2019-08-09
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the modulation sidelobe method requires multiple excitation sources, and the nonlinear component is very weak compared to the fundamental frequency component, which seriously affects the accuracy of detection

Method used

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  • Carrier modulation nonlinear ultrasonic guided wave damage detection method
  • Carrier modulation nonlinear ultrasonic guided wave damage detection method
  • Carrier modulation nonlinear ultrasonic guided wave damage detection method

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0025] Such as figure 1 As shown, it is a carrier-modulated nonlinear ultrasonic guided wave damage detection method, the method is input figure 2 Detection system is realized, and described method specifically comprises the following steps:

[0026] Step 10 selects 280kHz and 160kHz respectively as the high frequency and low frequency components according to the frequency response characteristics of the detection object, and performs delay processing on the high frequency components and combines them with the low frequency components to form a modulated carrier signal;

[0027] The frequency sweep experiment is carried out on the detection object, and its time domain signal is as follows: Figure 3a and frequency domain signals such as Figure...

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Abstract

The invention discloses a carrier modulation nonlinear ultrasonic guided wave damage detection method, comprising the following steps: selecting a high-low frequency component according to frequency response characteristic of a detection object, and performing delayed time processing on the high-low frequency component and combining with a low frequency component to form a modulated carrier signal; performing signal acquisition by adopting a single excitation-single reception mode, exciting the modulated carrier signal containing a high frequency component and the low frequency signal by virtue of a single-excitation transducer, generating nonlinear modulation effect by the carrier signal by virtue of interaction with damage during propagation, and acquiring by a reception transducer by virtue of a transmission method; according to arrival time of the high frequency component and time when an end surface reflects an echo, intercepting the signal and analyzing, performing filtering andnormalization processing on the signal, then decomposing a received signal by adopting an empirical mode decomposition method, and according to decomposed IMF frequency spectrum information, selectingIMF components containing a base frequency and a nonlinear frequency component and performing signal reconstruction; and extracting a difference frequency component of a high-frequency modulation sidelobe and a low-frequency modulation sidelobe, namely a nonlinear component, calculating a nonlinear coefficient, and evaluating material damage degree by taking a nonlinear coefficient of zero damageas a benchmark.

Description

technical field [0001] The invention relates to the technical fields of non-destructive testing technology and structural health monitoring, in particular to a damage detection method of carrier modulation nonlinear ultrasonic guided wave. Background technique [0002] Large-scale engineering structures such as aerospace vehicles, bridge engineering, ship engineering, and oil pipelines are in long-term service and are affected by the external environment, such as fatigue, corrosion effects, and material aging. Defects will inevitably form on the surface or inside of the structure. The occurrence of defects severely damages the structural integrity of engineering materials, resulting in a sharp decline in their performance, which can lead to serious accidents in actual use. In order to avoid sudden accidents, structural health monitoring technology has been widely concerned and developed. Structural health monitoring (SHM for short) is an online monitoring technology that co...

Claims

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Application Information

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IPC IPC(8): G01N29/12G01N29/44
CPCG01N29/12G01N29/44G01N2291/023G01N2291/0289G01N2291/102G01M5/0033G01N29/14G01M5/0066G01N2291/0258G01N29/46G01N29/42G01N2291/02491G01N29/4445G01M5/0025G01M7/025
Inventor 洪晓斌刘远
Owner SOUTH CHINA UNIV OF TECH
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