Transformation of Acoustic Pulses into Electromagnetic Signals in Defective Structures

Alekseevich, Bespal’ko Anatoly; Niyazbekovich, Isaev Yusup; Dmitrievich, Dann Denis; Karlovich, Pomishin Evgeny; Ivanovich, Fedotov Pavel; Петров, М. В.; Evgenievich, Utsyn Gregory

doi:10.1007/s10921-020-00727-9

Cited by 2 publications

References 21 publications

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Method for the P-wave arrival pickup of rock fracture acoustic emission signals under strong noise

Luo,

Bespal’Ko,

et al. 2024

Meas. Sci. Technol.

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This research aimed to investigate the accuracy of picking of P-wave arrival times in rock fracture acoustic emission signals. In order to simulate the mining scenario, Gaussian white noise and pulse noise were added to the data collected in the laboratory. CEEDMAN+Wavelet was improved in this paper, where the Spearman rank correlation coefficient was adopted to effectively select IMFs for denoising which retained the inherent characteristics of the rock fracture signal. The absolute amplitude and energy change rate of the envelope signal, calculated based on the Hilbert transform, were used as the input of the STA/LTA normalization algorithm to pickup the P-wave arrival time. The reliability of this method was tested on 30 groups of recorded rock fracture laboratory data and 60 groups of added noise data. Taking the manual pickup results as the standard, the errors of CEEDMAN+Wavelet+STA/LTA+AIC method with the absolute amplitude of the signal as the input are all within 10ms, and 86.67% of the results are within 5ms. The method proposed in this paper effectively addressing the issue of false pickup caused by the sensitivity of AIC and traditional STA/LTA method for strong noise, and achieving relatively high accuracy and stability in processing low SNR signals. This work contributes to monitor microscopic changes in rock bodies and is of great significance for the prediction and monitoring of geological disasters.

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Method for the P-wave arrival pickup of rock fracture acoustic emission signals under strong noise

Luo,

Bespal’Ko,

et al. 2024

Meas. Sci. Technol.

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Testing of Solid State Defects With Different Magnetic Properties in Dielectric Structures by the Parameters of Electromagnetic Response to Acoustic Excitation

Беспалько

Isaev

Dann

et al. 2022

Preprint

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The paper presents the measurement results for parameters of the electromagnetic response to deterministic acoustic excitation of magnetite ore samples and model samples of cement-sand and cement-glass mixtures with inclusions of ferrite magnet, magnetite ore, brass and duralumin, including that in the magnetic field. The possibility of testing the characteristics of magnetizable solid-state defects by electromagnetic signal parameters is shown. The dependences of the amplitude of electromagnetic responses to external pulsed acoustic excitation are given. The impact of changes in the direction of the constant magnetic field applied to the sample with a magnetite ore defect on parameters of electromagnetic responses is shown. It was revealed that changes in the strength of the external constant magnetic field under acoustic excitation significantly affect the amplitude of the electromagnetic signal of magnetite ore. The obtained patterns can be used for objective hardware determination of the content of magnetizable defects in the test dielectric structure, and the content of magnetite ore in rock cores.

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Transformation of Acoustic Pulses into Electromagnetic Signals in Defective Structures

Cited by 2 publications

References 21 publications

Method for the P-wave arrival pickup of rock fracture acoustic emission signals under strong noise

Method for the P-wave arrival pickup of rock fracture acoustic emission signals under strong noise

Testing of Solid State Defects With Different Magnetic Properties in Dielectric Structures by the Parameters of Electromagnetic Response to Acoustic Excitation

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