2. Home
  3. ARCHIVE
  4. 2024
  5. VOL 46, NO 2 (2024)
  6. pp. 60-74

ALGORITHMS FOR DIGITAL PROCESSING OF CORRELATION FUNCTIONS IN LEAK DETECTORS

A.A. Vladimirsky, I.A. Vladimirsky, D.M. Semenyuk

Èlektron. model. 2024, 46(2):60-74

https://doi.org/10.15407/emodel.46.02.060

ABSTRACT

The article is devoted to the processing of cross-correlation functions. The need for this processing is due to a wide variety of interference conditions for searching for leaks in underground pipelines. Interference often significantly distorts the appearance of correlation functions and makes it difficult to accurately determine the coordinates of damage for pipeline repairs. Various approaches to combating these distortions are considered, depending on the available information about the characteristics of interference and leakage noise. Such features as the characteristic delay of the correlation function, which often corresponds to an interference burst and features of the frequency distributions of interference and leakage noise. An algorithm for extracting the leak coordinate from the correlation function as the coordinate of the source of a broadband signal by orthogonal decomposition of the CCF is considered. This problem is solved on the basis of classical approaches to the synthesis of shaping and synthesis of matched filters. The connection between the results obtained is shown. Thus, two approaches were used: one has the main goal of suppressing interference, without directly determining the coordinates of leaks, the other, on the contrary, is focused primarily on the selection of useful correlation of leak noises. In real-life conditions, it is advisable to combine both approaches due to the variety of acoustic environments encountered.

KEYWORDS

pipeline, leak detector, correlation.

REFERENCES

  1. Knapp C., Carter G. The generalized correlation method for estimation of time delay. IEEE Transactions on Acoustics, Speech, and Signal Processing. 1976. Vol. 24, no. 4. P. 320-327. URL: 
    https://doi.org/10.1109/TASSP.1976.1162830
  2. Leak Detection and Location of Water Pipes Using Vibration Sensors and Modified ML Prefilter / J. Choi et al. Sensors. 2017. Vol. 17, no. 9. P. 2104. URL: 
    https://doi.org/10.3390/s17092104
  3. Claudia Deniss E.A., Luis Eduardo G.C., Adriana V.-M. Multi-leak detection with wavelet analysis in water distribution networks. 2012 20th Mediterranean Conference on Cont­rol & Automation (MED 2012), Barcelona, 3–6 July 2012. URL: 
    https://doi.org/10.1109/MED.2012.6265794
  4. Hamilton S., Charalambous B. Leak Detection. IWA Publishing, 2020. URL: 
    https://doi.org/10.2166/9781789060850
  5. Pipeline Leakage Detection Based on Secondary Phase Transform Cross-Correlation / H. Liang et al. Sensors. 2023. Vol. 23, no. 3. P. 1572. URL: 
    https://doi.org/10.3390/s23031572
  6. Vladimirsky , Vladimirsky І. (2023) Organization of digital filtering of data in the correlation leak detector. Energy security in the era of digital transformation: Materials of the 5th scientific and practical conference (p. 8-11). November 22, Kyiv, G.E. Pukhov Institute of Modeling Problems in Energy, National Academy of Sciences of Ukraine.
  7. Rabiner L., Gold B. (Trans. from engl., 1978) Theory and application of digital signal processing. М.: Mir. 848p.
  8. Vladimirsky , Vladimirsky I. (1998) About some methods for suppressing correlated interference when searching for leaks. Collection of scientific works IPME of the National Academy of Sciences (p. 73-76). Cherkasy, Issue. 6.
  9. Drobot Y., Greshnikov V., Bachegov V. (1989) Acoustic contact leak detection.: Mechanical engineering. 120 p.
  10. Gribanov Y., Veselova G., Andreev V. (1971) Automatic digital correlators. M.: Energy. 1971. 240 p.
  11. Vladimirsky A., Vladimirsky I. (1998) About some methods for automatically adjusting filters in correlation-type leak detectors. Collection of scientific works IPME of the National Academy of Sciences (p.179-188). Lvіv, Issue
  12. Application of digital signal processing. (Trans. from engl.,1980) / Edited by Oppenheim A. M.: Mir, 550p.
  13. Adaptive filters. (Trans. from engl.,1988)/ Edited by K.F.N. Kouen and P.M. Grant. M.: Mir, 392p.
  14. Gonorovsky I. (1986) Radio engineering circuits and signals. Textbook for universities.-4th ed.. M.: Radio and communications, 512 p.
  15. Vladimirsky A. A., Vladimirsky I. A. Correlation Parametric Methods for Determining the Coordinates of Leaks in Underground Pipelines. Èlektronnoe modelirovanie. 2021. Vol. 43, no. 3. P. 3-16. URL: 
    https://doi.org/10.15407/emodel.43.03.003

Full text: PDF