Abstract
As the influence of rotation effect, the frequency of cavity creating and bursting is modulated by the shaft frequency, blade frequency and double blade frequency when the cavitation is given birth to impeller machine. The cavitation measurement of a certain real ship’s waterjet pump is performed in this paper. The inlet underwater acoustic pressure signals (direct effect) and the shell vibration signals (indirect effect) of cavitation are obtained in the test. The demodulation techniques including time-delay, correlation and envelope are studied and the cavitation modulation characteristic of waterjet pump is successfully extracted by this means. Also, the introduction of time-delay technology is greatly increasing signal to noise ratio. The results show that the cavitation signal is of modulation characteristic, which can be made use of for on-line monitoring of cavitation.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
He, J., Wang, Y., Ding, J.: Study on principles and methods of cavitation prediction of a waterjet pump. China Shiprepair 19(2), 24–26 (2004)
Kaye, M.: Cavitation Monitoring of Hydraulic Machines by Vibration Analysis. Laboratoire de Machines Hydrauliques (LMH), Switzerland (2000)
Osterman, A., Hocevar, M., Sirok, B., et al.: Characterization of incipient cavitation in axial valve by hydrophone and visualization. Expermental Thermal and Fluis Science (33), 620–629 (2009)
Cudina, M., Prezelj, J.: Detection of cavitation in situ operation of kinetic pumps:effect of cavitation on the characteristic discrete frequency component. Applied Acoustics (70), 1175–1182 (2009)
Wu, D.: Study on the technique of hydro-turbine’s condition monitoring based on acoustic. Huazhong University of Science and Technology, Wuhan (2006)
Su, Y., Wang, Y., Yan, F., et al.: Study on the analysis and extracted methods of modulation characteristic which belongs to the cavitation vibration signals. Journal of Vibration Measurement and Diagnosis 30(5), 570–572 (2010)
Xavier, E., Mohamed, F., Eduard, E., et al.: Dynamics and intensity of erosive partial cavitation. Transactions of the ASME (129), 886–893 (2007)
Meng, T., Liao, M.: Diagnose rolling bearing fault with the demodulation method of time-delay correlation. Acta Aeronautica et Astronautica Sinica 25(1), 41–44 (2004)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Song, J., Liu, Y., Yang, Q. (2012). Research on the Demodulation Technique of Waterjet Pump Cavitation Characteristic. In: Zhao, M., Sha, J. (eds) Communications and Information Processing. Communications in Computer and Information Science, vol 288. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31965-5_3
Download citation
DOI: https://doi.org/10.1007/978-3-642-31965-5_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-31964-8
Online ISBN: 978-3-642-31965-5
eBook Packages: Computer ScienceComputer Science (R0)