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Non-convex variable contig sparse variation method for steel ingot ultrasonic signal noise reduction

An ultrasonic signal and contig technology, which is applied in the direction of using sonic/ultrasonic/infrasound for material analysis, processing the response signal of detection, analyzing material, etc. Amplitude attenuation, improve the effect of waveform distortion

Pending Publication Date: 2022-01-14
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the problems of waveform distortion and amplitude attenuation in traditional noise reduction methods, this patent proposes a non-convex variable contig sparse variational method that can be used for noise reduction of steel ingot ultrasonic signals

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  • Non-convex variable contig sparse variation method for steel ingot ultrasonic signal noise reduction
  • Non-convex variable contig sparse variation method for steel ingot ultrasonic signal noise reduction
  • Non-convex variable contig sparse variation method for steel ingot ultrasonic signal noise reduction

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Embodiment Construction

[0052] Combine below Figure 1 to Figure 9 , taking typical steel ingot ultrasonic signals and ultrasonic imaging as examples, the implementation process of the non-convex variable contig sparse variational method is described in detail.

[0053] (1) Non-convex variable contig sparse variation method for noise reduction analysis of steel ingot ultrasonic signal

[0054] The specific implementation steps of the non-convex variable contig sparse variation method for noise reduction of typical steel ingot ultrasonic signals are given below.

[0055] 1. Through the DPR 500 ultrasonic pulse transmitter receiver, use the Shanchao 1Z30N probe to collect the ultrasonic signal of the test piece 42CrMo die-cast billet steel ingot, figure 2 The time-domain waveform diagram of the ultrasonic signal of the steel ingot is given.

[0056] 2. Under the same regularization parameter and multiplication factor level, use three non-convex variable functions to perform non-convex variable conti...

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Abstract

The invention discloses a non-convex variable contig sparse variation method for steel ingot ultrasonic signal noise reduction, and belongs to the field of nondestructive testing. Based on an existing sparse noise reduction method, by adjusting regularization parameters, the noise reduction effect can be effectively guaranteed, but the problems of waveform distortion and amplitude attenuation of signals occur. The method comprises considering interference of scattering noise generated by a steel ingot ultrasonic detection signal influenced by a grain structure on a defect signal; providing the non-convex variable contig sparse variation method by utilizing the characteristic that a non-convex variable function has good sparsity according to the clustering attribute and variational characteristic characteristics of different amplitude points of a signal. Noise reduction of steel ingot ultrasonic detection signals is achieved, waveform distortion is restrained, the signal amplitude level is kept, and the signal-to-noise ratio of defect imaging is increased. In order to achieve a good noise reduction effect in the noise reduction process, non-convex variable function types, regularization parameters and multiplication factors in the noise reduction method are optimized.

Description

technical field [0001] The invention relates to a non-convex variable contig sparse variation method for noise reduction of steel ingot ultrasonic signals. The method is suitable for eliminating scattering noise in steel ingot ultrasonic signals and improving the signal-to-noise ratio of defect imaging, and belongs to the field of nondestructive testing. Background technique [0002] With the rapid development of my country's manufacturing industry, large forgings are widely used in many fields such as oil, natural gas, aerospace and nuclear industries. The large forgings used in modern times are all rolled or forged from steel ingots, so the quality of the steel ingots and the condition of the ingot shape have a very important influence on the large forging products. Ultrasonic testing is currently the most widely used nondestructive testing method because of its high sensitivity to various types of defects in components. The grain size inside the steel ingot is different ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/10G01N29/44G06F119/02
CPCG06F30/20G06F17/10G01N29/4463G01N29/449G01N2291/0234G01N2291/0289G06F2119/02
Inventor 焦敬品张家玮陈昌华
Owner BEIJING UNIV OF TECH
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