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Ultrasonic lamb wave defect signal identification method based on variational mode decomposition

A technology of variational mode decomposition and ultrasonic Lamb wave, which is applied in the field of information processing, can solve the problems of modal aliasing and false components and the inability to accurately detect defect signals, so as to improve the accuracy and recognition rate and avoid false components , to avoid the effect of modal aliasing

Active Publication Date: 2021-06-29
DALIAN OCEAN UNIV
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  • Application Information

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Problems solved by technology

[0005] The present invention mainly solves the technical problems that the decomposition effect in the variational modal decomposition of the prior art is affected by the decomposition layer number k and the penalty factor α, there will be false components caused by modal aliasing, and the defect signal cannot be accurately detected. A method for identifying ultrasonic Lamb wave defect signals based on variational mode decomposition, in order to improve the accuracy and recognition rate of ultrasonic Lamb wave defect signal detection

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  • Ultrasonic lamb wave defect signal identification method based on variational mode decomposition
  • Ultrasonic lamb wave defect signal identification method based on variational mode decomposition
  • Ultrasonic lamb wave defect signal identification method based on variational mode decomposition

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Embodiment 1

[0066] Such as figure 1 As shown, the method for identifying ultrasonic Lamb wave defect signals based on variational mode decomposition provided by the embodiment of the present invention includes the following process:

[0067] Step 1, using the electromagnetic ultrasonic transducer to generate excitation signals to detect the aluminum plate, and the receiving transducer on the other side of the aluminum plate to receive the original signal of the ultrasonic Lamb wave.

[0068] The signal generator generates an excitation signal, and the excitation signal is amplified by the power amplifier to excite the aluminum plate to be detected, and the ultrasonic Lamb wave is generated and propagated in the aluminum plate to be detected, and the ultrasonic Lamb wave will reflect and scatter when it passes through a defect on the aluminum plate. The echo signal f(t) is received by the receiving transducer on the other side of the aluminum plate, as the variational mode decomposition (V...

Embodiment 2

[0150] The ultrasonic Lamb wave defect signal identification method based on variational mode decomposition provided by the embodiment of the present invention includes:

[0151] Step 1: Use the signal generator to generate excitation signals to detect the aluminum plate, and the receiving transducer on the other side of the aluminum plate receives the original signal of the ultrasonic Lamb wave.

[0152] Figure 4In order to detect that the plate is an aluminum plate material, the specific parameters are: 1000mm×900mm×0.5mm. The excitation frequency is 130KHz, A0 is the main excitation mode, the group velocity is 1507m / s, and the phase velocity is 784.8m / s. The signal used in the experiment is excited by an ultrasonic transducer, and the signal propagates on the surface and inside of a 1mm aluminum plate and reflects and scatters when encountering boundaries and defects, and finally forms a Lamb wave. Actual signals such as Figure 5 As shown, the signal is composed of the...

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Abstract

The invention relates to the technical field of information processing, and provides an ultrasonic lamb wave defect signal identification method based on variational mode decomposition, 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; 2, determining input parameters of variational mode decomposition, wherein the input parameters comprise a decomposition layer number, a secondary penalty factor and a termination condition; 3, carrying out variational mode decomposition; 4, determining a final decomposition layer number, and obtaining sub-signals at the center frequency after separation; 5, selecting and optimizing a variational mode decomposition input parameter-penalty factor by adopting a particle swarm algorithm; and 6, variational modal is carried out by using the final decomposition layer number and the optimized penalty factor, complete extraction of defect signals is ensured, and defect identification is carried out by obtaining the defect signals of the center frequency. According to the invention, the accuracy and the recognition rate of ultrasonic lamb wave defect signal detection can be improved.

Description

technical field [0001] The invention relates to the technical field of information processing, in particular to an ultrasonic Lamb wave defect signal identification method based on variational mode decomposition. Background technique [0002] Since there are many sudden variables in the ultrasonic detection signal, it is necessary to select a suitable processing method according to the characteristics of the ultrasonic signal itself when performing signal processing. There is often a lot of noise in the ultrasonic signal collected in the experiment, which will have a great impact on signal processing and feature analysis. When evaluating various defects, there is no uniform standard, which will cause many detection signals to be indistinguishable from other similar signals even if they contain defects. [0003] Dragomiretskiy proposed the variational mode decomposition method (VMD). Compared with other decomposition methods, this method not only has a better theoretical bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44G06K9/00G06K9/62G06N3/00
CPCG01N29/4454G06N3/006G06F2218/12G06F18/2415Y02T90/00
Inventor 李松松张宸宸杨莹李晨何慧敏张琦董萍
Owner DALIAN OCEAN UNIV
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