10.14489/td.2017.10.pp.018-026

2017, 10 October

DOI: 10.14489/td.2017.10.pp.018-026

Stepanova L. N., Seryeznov A. N., Kabanov S. I., Ramazanov I. S.
WAVELET TRANSFORM APPLICATION FOR ACOUSTIC EMISSION SIGNALS LOCATION
(pp. 18-26)

Abstract. Various methods of acoustic emission (AE) (RMS, modified two intervals, by wavelet transform) signals location are analyzed in metal and composite specimens and structures under static and cyclical loading. It is checked the linearity of change of the arrival times difference (ATD) of the AE signals at the local wavelet transform extremum. The average speed of the mode of wave propagation, which calculated the ATD, and their error of nonlinearity are determined. It is shown that location minimal scattering is obtained by wavelet transform application for AE signals, but non-linear dependence of arrival time differences from imitator sensor to piezoantenna sensor distance is registered. The algorithm for determining the arrival times of AE signals at the local extremum of the wavelet transform is being applied during research of a carbon fiber sample with the installed sensor imitator. It is suggested the method of determining the arrival time of the AE signal by the fast wavelet transform level, which contained the maximum value of the wavelet coefficient. It is shown that the results of using the developed method for location of AE signals in the process of strength testing of composite front spar of the upper wing of the aircraft. The usage of wavelet transformation allowed to obtain more accurate location of a distributed defect in the breaking-off of the top flange beam from the wall that corresponds to the actual scene of destruction.

Keywords: acoustic emission, defect, location, wavelet transform.

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L. N. Stepanova, A. N. Seryeznov, S. I. Kabanov, I. S. Ramazanov (Federal State Unitary Enterprise “Siberian Aeronautical Research Institute named after S. A. Chaplygin”, Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Stepanova L. N., Chernova V. V., Ramazanov I. S. A procedure for locating acoustic-emission signals during static testing of carbon composite samples. Defektoskopiia, 51(4), pp. 227-235. [in Russian language]
2. Nedoseka S. A., Ovsienko M. A., Kharchenko L. F., Yaremenko M. A. (2015). Optimization of sensor placing and improvement of accuracy of location of acoustic emission sources. Tekhnicheskaya Diagnostika i Neraz-rushayushchiy Kontrol, (3), pp 18-24. [in Russian language]
3. Nedoseka S. A., Ovsienko M. A. (2012). Features of processing acoustic emission data at application of complex and multiple location arrays. Tekhnicheskaya Diagnostika i Nerazrushayushchiy Kontrol, (2), pp 7-12. [in Russian language]
4. Seryeznov A. N., Stepanova L. N., Muraviev V. V. et al. (2004). Transport objects diagnostics by means of acoustic emission. Moscow: Mashinostroenie, Mashinostroenie – Polyot. [in Russian language]
5. Stepanova L. N., Tenitilov E. S. (2012). Localization of acoustic-emission sources in objects with small geometric dimensions. Defektoskopiia, 48(11), pp. 662-671. [in Russian language]
6. Seryeznov A. N., Stepanova L. N., Kabanov S. I. et al. (2008). Aircraft structure monitoring using acoustic emission technique. Moscow: Mashinostroenie, Mashinostroenie – Polyot. [in Russian language]
7. Stepanova L. N., Ramazanov I. S., Chernova V. V. (2015). Acoustic emission signals structure wavelet analysis while strength tests of carbon fiber samples. Kontrol'. Diagnostika, (7), pp. 54-62. [in Russian language]
8. Stepanova L. N., Kabanov S. I., Ramazanov I. S. (2008). Wavelet filtering in acoustic emission signals location tasks. Kontrol'. Diagnostika, (1), pp. 15-19. [in Russian language].

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