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Ultrasonic signal processing method based on CEEMDAN combined wavelet packet threshold

A wave packet threshold, ultrasonic signal technology, applied in the field of signal processing, can solve problems such as inability to meet the needs of analysis and feature extraction, complex echo signals, etc.

Pending Publication Date: 2022-04-01
DALIAN OCEAN UNIV
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Problems solved by technology

Due to the dispersion and multi-modality of the ultrasonic guided wave signal, coupled with the influence of environmental noise and other aspects, the received echo signal is very complex and cannot meet the needs of further analysis and feature extraction

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  • Ultrasonic signal processing method based on CEEMDAN combined wavelet packet threshold
  • Ultrasonic signal processing method based on CEEMDAN combined wavelet packet threshold
  • Ultrasonic signal processing method based on CEEMDAN combined wavelet packet threshold

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[0046] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.

[0047] Such as figure 1 As shown, the ultrasonic signal processing method based on the CEEMDAN joint wavelet packet threshold provided by the embodiment of the present invention includes the following process:

[0048] Step 1, using the electromagnetic ultrasonic transducer to generate an excitation signal to detect the aluminum plate, and receiving the original signal of the ultr...

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Abstract

The invention relates to the technical field of signal processing, and provides an ultrasonic signal processing method based on CEEMDAN combined wavelet packet threshold, which comprises the following steps of: 1, generating an excitation signal by using an electromagnetic ultrasonic transducer to detect an aluminum plate, and receiving an original signal of an ultrasonic lamb wave by using a receiving transducer on the other side of the aluminum plate; step 2, determining input parameters of complete set empirical mode decomposition of adaptive noise according to the obtained original signals of the ultrasonic lamb waves; step 3, according to the determined input parameters of the CEEMDAN, performing CEEMDAN decomposition to obtain n IMF components from high frequency to low frequency; 4, determining a k value through a correlation coefficient method; step 5, wavelet packet threshold processing is carried out on the first k-1 IMF components; and step 6, performing signal reconstruction on the IMF after threshold processing and the reserved IMF. The method can improve the signal processing efficiency and reduce the decomposition time.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an ultrasonic signal processing method based on CEEMDAN joint wavelet packet threshold. Background technique [0002] Ultrasonic nondestructive testing technology is a nondestructive testing method that uses ultrasonic waves to propagate and reflect in a test piece to detect internal defects. Due to the dispersion and multi-modality of the ultrasonic guided wave signal, coupled with the influence of environmental noise and other aspects, the received echo signal is very complex and cannot meet the needs of further analysis and feature extraction. [0003] In order to accurately detect defect information, the collected echo signal must first be denoised. However, the commonly used denoising method destroys the useful signal while removing the noise. Therefore, the use of a suitable signal processing method is conducive to improving the detection efficiency. accuracy of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
Inventor 李松松杨莹李晨张琦何慧敏董萍
Owner DALIAN OCEAN UNIV
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