ANALYSIS OF THE INFLUENCE OF FILTRATION ON THE SENSITIVITY OF THE CUMULANT METHOD OF DETECTING THE ACOUSTIC SIGNALS OF LEAKAGE


  • V.S. Beregun National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», 16, Politekhnichna str., Kyiv, 03057, Ukraine
  • A.I. Krasilnikov Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine, 2a, Zhelyabova str., Kyiv, 03680, Ukraine
  • T.A. Polobyuk Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine, 2a, Zhelyabova str., Kyiv, 03680, Ukraine
Keywords: acoustic contact leak test, detection of a leakage signal, acoustic noise signals, cumulant analysis

Abstract

An experimental study of the ratio of cumulants of acoustic signals of fluid leakage in a pipeline and interference is carried out. It is shown that the use of bandpass filtering increases the ratio of cumulants by orders of magnitude.

The purpose of the article is to analyze the sensitivity of the cumulant method of detecting fluid leaks in a pipeline based on the statistical processing of the acoustic leakage signal and interference generated by the moving fluid flow. To analyze the possibilities of a cumulant leak detection method, it is necessary to have specific values of cumulants of real leakage signals and interference, which can be obtained as a result of a full-scale experiment.

To generate a leakage signal, an installation is used that allows physical modeling of the leakage of liquid in the pipe in standing water. To simulate a leak in a pipe, a nozzle with copper walls and a through hole with a diameter of 1 mm was used, and a pressure of 6 atmospheres was maintained to produce leakages in the pipe. As a interference, noise generated by a moving fluid flow in the pipeline is used. The interference was recorded on the pipeline of the distribution network at a pressure of 7 atmospheres, the volume flow of the coolant averaged more than 1000 liters per hour, which ensured the flow rate of the fluid at which its motion can be considered turbulent.

The results of experimental studies of acoustic signals of fluid leakage in the pipeline and interference showed that the main interference power is concentrated in the 0...5 kHz band, and the leakage signal is in the band 5...10 kHz. With the use of bandpass filtering, the ratio of the mean square deviation of the leakage signals and interference increased by more than an order of magnitude for the frequency bands 5...10 kHz and 10...15 kHz, as compared with the absence of filtering. In this case, the ratio of the absolute values of the cumulants of the leakage signal and the interference is much greater than the ratio of the variances, and the ratio of cumulants increases substantially with increasing order. This confirms the sensitivity of high-order cumulants to the presence of a leak.

References

1. Acoustic diagnostics and control at enterprises of the fuel and energy complex / V.M. Baranov, A.I. Gritsenko, A.M. Karasevich i dr. – Moscow: Nauka, 1998. 304 p. (Rus.)
2. Ziganshin Sh.G., Vankov Iu.V., Izmailova E.V. Monitoring of technical condition of pipelines by acoustic methods: Monografiia. – Kazan: Izd-vo Kazan. feder. un-ta, 2015. 156 p. (Rus.)
3. Drobot Iu.B., Greshnikov V.A., Bachegov V.N. Acoustic contact leak test. – Moscow: Mashinostroenie, 1989. 120 p. (Rus.)
4. Kuznetsov N.S., Tarasiuk P.S. Using the theory of hydrodynamic noise to search for fluid leaks in underground pipelines // Kontrol. Diagnostika. 2000. № 6. P. 6–14. (Rus.)
5. Samoilov E.V., Tuzhilkin Iu.I. Effectiveness of the use of correlation leak detectors for the determination of leaks from heat supply pipelines // Novosti teplosnabzheniia. 2001. № 7 (11). P. 24–27. Rezhim dostupa: www.ntsn.ru. (Rus.)
6. Vladimirskii A.A., Vladimirskii I.A., Semeniuk D.N. Refinement of the diagnostic model of the pipeline to increase the reliability of leak test // Akustychnyi vіsnik. 2005. Vol. 8, № 3. P. 3–16. (Rus.)
7. Monitoring Acoustic Noise in Steel Pipelines / Dieter Meinert, Michael Gorny, Ansgar Pollmann, Jie-Wei Chen and Andrea Garbi // 7th International Pipeline Conference, Volume 1, Calgary, Alberta, Canada, September 29 – October 3, 2008. – ASME. – P. 509–516. – Rezhim dostupa: http://proceedings.asmedigitalcollection.asme.org/proceeding. aspx?articleID=1640343 (Eng.)
8. Stroganov V.A., Khorolich V.N. Experimental investigation of leakage signals of underground pipelines // Visnyk SevNTU. Vyp. 101: Informatyka, elektronika, zviazok: zb. nauk. pr. – Sevastopol: Vyd-vo SevNTU, 2010. P. 29–32. (Rus.)
9. Krasilnikov A.I., Beregun V.S., Polobyuk T.A. Statistical analysis of physical models of acoustic signals of fluid leakage in a pipeline // «KONSONANS–2015», akustychnyi sympozium, 29–30 veresnia 2015 r.: Zbirnyk prats. – Kyiv: Instytut hidromekhaniky NAN Ukrainy, 2015. P. 116–121. (Rus.)
10. Beregun V.S., Krasilnіkov A.І., Polobyuk T.A. Statistical analysis of acoustic signals of fluid leaks in pipelines // Neruinivnyi kontrol ta tekhnichna diahnostyka: materialy 8-yi Natsionalnoi naukovo-tekhnichnoi konferentsii, Kyiv, 22–24 lystopada 2016 r., Kyiv, UT NKTD, 2016. P. 168–173. (Rus.)
11. Hardware and software for monitoring the objects of generation, transportation and consumption of thermal energy: Monohrafiia / V.P. Babak ta in.; za red. V.P. Babaka. – Kyiv: In-t tekhnichnoi teplofizyky NAN Ukrainy, 2016. 298 p. (Ukr.)
12. Malakhov A.N. Cumulant Analysis of Random Non-Gaussian Processes and their Transformations. – Moscow: Sov. radio, 1978. 376 p. (Rus.)
13. Pat. 112139 Ukraina, MPK F17D 5/02; G01N29/14; G01M 3/04; G01M 3/24 (2006.01). Sposib vyiavlennia vytoku ridyny v truboprovodakh / V.P. Babak, A.I. Krasilnikov, T.A. Polobyuk; zaiavnyk ta vlasnyk Instytut tekhnichnoi teplofizyky NAN Ukrainy. – № a 2015 05917: zaiavl. 15.06.2015; opubl. 25.07.2016, Biul. № 14. (Ukr.)
14. Krasilnіkov A.І., Polobyuk T.A. Installation for physical modeling and experimental study of leaks in the pipeline // Metrolohiia ta prylady. 2014. № 1; II (45). P. 147–150. (Rus.)
15. Informatsiine zabezpechennia monitorynhu obiektiv teploenerhetyky: Monohrafiia / V.P. Babak ta in.; za red. V.P. Babaka. Kyiv: In-t tekhn. teplofizyky NAN Ukrainy, 2015. 512 p. (Ukr.)

Abstract views: 60
PDF Downloads: 43
Published
2018-06-20
How to Cite
Beregun, V., Krasilnikov, A., & Polobyuk, T. (2018). ANALYSIS OF THE INFLUENCE OF FILTRATION ON THE SENSITIVITY OF THE CUMULANT METHOD OF DETECTING THE ACOUSTIC SIGNALS OF LEAKAGE. Thermophysics and Thermal Power Engineering, 40(2), 78-83. https://doi.org/https://doi.org/10.31472/ihe.2.2018.11
Section
Measurement, Control and Automation of Thermal Processes