Measurement of acoustic emission velocity in natural ester

Wotzka, Daria; Kozioł, Michał; Nagi, Łukasz

doi:10.1109/epe.2019.8777963

Cited by 3 publications

(4 citation statements)

References 19 publications

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“…The tank was filled with the considered dielectric liquids, details of their physical properties are given in Table 1. A detailed description of the measuring setup and parameters of the applied transducers is given in previously published work [22]. A scheme diagram of the experimental setup is depicted in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…As the AE wave undergoes significant attenuation, especially in the HF range, it is impossible to record pressure changes over long distances. The distances considered in this study were chosen experimentally, as part of basic works [22]. In real transformers, the AE wave will undergo additional phenomena such as damping, refraction, reflections, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The main contribution of the here presented research study lies in the determination of the influence of distance and modulation frequency of the AE wave on its velocity, in various dielectric liquids. The results of preliminary works were obtained for natural ester and are presented in [22]. In this article, comparative analyses for the velocity measurements of AE waves propagating in three types of dielectrics are presented.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Frequency and Distance on Acoustic Emission Velocity Propagating in Various Dielectrics

Wotzka

2020

Applied Sciences

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The results obtained for the measurements of acoustic emission (AE) signal parameters emitted in three dielectric liquids are presented in this paper. In particular, the velocity of AE wave was calculated based on the time of arrival of the AE signal. A frequency modulated signal was generated by a piezoelectric transducer and measured at various distances by a hydrophone. The changes in velocity values at particular distances and for different frequencies were investigated. The analyses include the determination of the dependency of the velocity values from the distance between the communicating devices. A nonlinear regression model was calculated, and the differences between AE velocities propagating in the considered dielectrics were determined. Similarly, the influence of modulation frequency on the AE velocity was determined using nonlinear regression. Based on the calculation data, it can clearly be stated that the velocity of AE wave depends significantly on the frequency and distance at which it is registered. These two factors may have an important influence on the localization of partial discharges (PD) occurring in these types of dielectric liquids.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Frequency and Distance on Acoustic Emission Velocity Propagating in Various Dielectrics

Wotzka

2020

Applied Sciences

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“…For composite materials, the differences in structural layers, elastic modulus and density affect the propagation velocity of the AE wave [34,35]. In the characteristic medium, the AE wave velocity in liquid nitrogen [36] and natural fat [37] has also attracted researchers' attention.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Wave Velocity Measurement of Asphalt Mixture by Arbitrary Wave Method

Liu

Wang

et al. 2021

Applied Sciences

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The wave velocity of acoustic emission (AE) can reflect the properties of materials, the types of AE sources and the propagation characteristics of AE in materials. At the same time, the wave velocity of AE is also an important parameter in source location calculation by the time-difference method. In this paper, a new AE wave velocity measurement method, the arbitrary wave (AW) method, is proposed and designed to measure the AE wave velocity of an asphalt mixture. This method is compared with the pencil lead break (PLB) method and the automatic sensor test (AST) method. Through comparison and analysis, as a new wave velocity measurement method of AE, the AW method shows the following advantages: A continuous AE signal with small attenuation, no crosstalk and a fixed waveform can be obtained by the AW method, which is more advantageous to distinguish the first arrival time of the acoustic wave and calculate the wave velocity of AE more accurately; the AE signal measured by the AW method has the characteristics of a high frequency and large amplitude, which is easy to distinguish from the noise signal with the characteristics of a low frequency and small amplitude; and the dispersion of the AE wave velocity measured by the AW method is smaller, which is more suitable for the measurement of the AE wave velocity of an asphalt mixture.

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A method for Localization of Single source Partial Discharges using Acoustic Sensors and Random Forest Algorithm

Jariwala

Pradeep

Biswas³

et al. 2023

2023 5th International Conference on Energy, Power and Environment: Towards Flexible Green Energy Technologies (ICEPE)

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Measurement of acoustic emission velocity in natural ester

Cited by 3 publications

References 19 publications

Influence of Frequency and Distance on Acoustic Emission Velocity Propagating in Various Dielectrics

Influence of Frequency and Distance on Acoustic Emission Velocity Propagating in Various Dielectrics

Acoustic Emission Wave Velocity Measurement of Asphalt Mixture by Arbitrary Wave Method

A method for Localization of Single source Partial Discharges using Acoustic Sensors and Random Forest Algorithm

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