Acoustic emission method as a tool of partial discharges indication

Kořenská, Marta; Pazdera, Lubos; Manychová, Monika

doi:10.1504/ijmpt.2011.045468

Cited by 6 publications

(6 citation statements)

References 1 publication

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“…The selected signals (covered all types of acoustic emission events) were carried out by a Joint Time Frequency Analysis known as Short Fourier Transform working on the principle of the Discrete Fourier Transform [17]. Note the basis function of the Fourier Transform is a sinusoid, thus equation of STFT is [18] ( )…”

Section: Measurement and Methodologymentioning

confidence: 99%

Three-Point Bending Test Evaluation of Concrete Specimens by Non-Traditional Analysis of Acoustic Emission Method

Pazdera

Topolář

Vymazal

et al. 2016

AMM

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The aim of the paper is focused on the analysis of the mechanical properties of the concrete specimens with plasticizer at three point bending test by the signal analysis of the acoustic emission signal. The evaluations were compared the measurement and the results obtained with theoretical presumptions. The Joint Time Frequency Analysis applied on measurement data and its evaluation is described. It is well known that the Acoustic Emission Method is a very sensitive method to determine active cracks into structure. However, evaluation of acoustic emission signals is very difficult. A non-traditional method was used to signal analysis of burst acoustic emission signals recorded during three point bending test.

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Section: Measurement and Methodologymentioning

confidence: 99%

Three-Point Bending Test Evaluation of Concrete Specimens by Non-Traditional Analysis of Acoustic Emission Method

Pazdera

Topolář

Vymazal

et al. 2016

AMM

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“…The method can be successfully applied for locating cavities and delamination, determining the depth of the open cracks in a surface or measuring a structure thickness. [11][12][13][14] Another important parameter of the ceramic tiles is the modulus of elasticity expressing the capacity of the material in question to undergo elastic or viscous deformations under the influence of an external load. The materials with a high modulus of elasticity feature low deformations; however, heavy tensions are generated in them even by low deformations.…”

Section: Methodsmentioning

confidence: 99%

Assessment of the impact-echo method for monitoring the long-standing frost resistance of ceramic tiles

Matysík¹,

Plšková²,

Chobola³

2015

Mater. Tehnol.

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The aim of this paper is to evaluate the possibility of using the impact-echo method for monitoring extremely long-term frost resistance of ceramic tiles. Non-destructive testing methods make it possible to sensitively identify the occurrence and development of defects in materials. Impact-echo methods belong to the family of non-destructive testing methods and can be applied in many branches, among others also in civil engineering. To assess the ceramic-tile frost resistance, a new measurement method was developed based on using the acoustic properties of ceramic tiles. Sets of ceramic tiles of the Ia class were analyzed according to the EN 14 411 B standard. The ceramic tiles under investigation were subjected to degradation due to 500 freezethaw cycles in compliance with the relevant EN ISO 10545-12 standard. To verify the correctness of the impact-echo-method results, additional physical properties of the tested ceramic tiles were measured. To analyze the specimen-surface condition, we also used an Olympus LEXT 3100 confocal scanning microscope. It was proved that the impact-echo acoustic method is a sensitive indicator of a structure condition and can be applied to assess the frost resistance of a ceramic cladding element and predict its service life. Keywords: impact-echo, ceramic tiles, frost resistance, confocal microscopy, freeze-thaw cycles Namen tega~lanka je oceniti mo`nosti za uporabo metode Impact-echo za kontrolo ekstremno dolge odpornosti kerami~nih plo{~ic proti zmrzali. Neporu{ne preiskovalne metode omogo~ajo selektivno identifikacijo pojava in napredovanja napak v materialu. Metoda Impact-echo pripada skupini neporu{nih metod preiskav in je uporabna v mnogih bran`ah, med drugim tudi v gradbeni{tvu. Za oceno odpornosti kerami~nih plo{~ic je bila razvita nova merilna metoda, ki temelji na akusti~nih lastnostih kerami~nih plo{~ic. Analizirani so bili kompleti kerami~nih plo{~ic kvalitete Ia po standardu EN 14 411 B. Preiskovane kerami~ne plo{~ice so bile izpostavljene degradaciji pri 500 ciklih zamrznitve-odtaljevanja skladno z odgovarjajo~im standardom EN ISO 10545-12. Za preverjanje ustreznosti rezultatov metode Impact-echo so bile izmerjene dodatne fizikalne lastnosti kerami~nih plo{~ic. Za analizo stanja povr{ine vzorca je bil uporabljen konfokalni vrsti~ni mikroskop Olympus LEXT 3100. Dokazano je bilo, da je akusti~na metoda Impact-echo ob~utljiv pokazatelj stanja konstrukcije in je uporabna za ugotavljanje odpornosti proti zmrzovanju kerami~nih plo{~ic in za napovedovanje trajnostne dobe plo{~ic. Klju~ne besede: Impact-echo, kerami~ne plo{~ice, odpornost proti zmrzovanju, konfokalna mikroskopija, cikli zmrzovanje-odtaljevanje

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“…Acoustic techniques are very often used to evaluate concrete [1][2][3]. The impact-echo method is based on the application of a short-duration stress pulse on the concrete surface by a mechanical impact [4][5].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Testing of High Temperature Degraded Concrete Composite of Portland Cement CEM I 42.5 R and Gravel Aggregate 11/22 by Transverse Waves

Dvořák

Chobola

Hela

et al. 2017

AMM

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This paper study applicability of non-destructive method of impact echo for diagnosis of high temperature degraded plain concrete. Impact echo method is often used for detection of defects, cracks, and non-homogeneity in constructions. It's based on impact-generated mechanical wave that propagate through the mass of testing specimen and is reflected and partially absorbed by voids and surface. In this paper, we present results of an experiment where test specimens of dimension 0.1 x 0.1 x 0.4 m were created with usage of coarse aggregate 11/22 mm. Specimens has been divided to 7 sets. First set of test specimens were kept at laboratory conditions as a reference. Next six sets were heated up to 1200 ° C. After this heating, the specimens were cooled spontaneously and then tested by impact echo method. We used a steel hammer as an exciter of mechanical wave, which has been transferred to signal by the piezoelectric sensor. Then we analyzed this signal and we focused on transverse waves. Results from non-destructive tests were compared with results from destructive tests.

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Acoustic emission method as a tool of partial discharges indication

Cited by 6 publications

References 1 publication

Three-Point Bending Test Evaluation of Concrete Specimens by Non-Traditional Analysis of Acoustic Emission Method

Three-Point Bending Test Evaluation of Concrete Specimens by Non-Traditional Analysis of Acoustic Emission Method

Assessment of the impact-echo method for monitoring the long-standing frost resistance of ceramic tiles

Non-Destructive Testing of High Temperature Degraded Concrete Composite of Portland Cement CEM I 42.5 R and Gravel Aggregate 11/22 by Transverse Waves

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