Frequency and Time-Frequency Analysis of Acoustic Cavitation Noise in Insulating Oils

• Authors: M. Szmechta , T. Boczar , P. Frącz
• Languages of publication: EN

Abstracts

EN

The paper presents some observations of ultrasound induced cavitation phenomenon in a mineral insulating oil. The acoustic cavitation phenomenon was generated at different signal frequencies and rms voltage value supplied to round piezoelectric transducers. Used transducers have created a high energy acoustic field in prepared insulating oil samples. The acoustic emission signal contains a broad-band noise and a fundamental frequency component and its harmonics, produced by the direct driving acoustic field. The paper presents the spectral analysis of acoustic emission signal observed during acoustic cavitation in insulating oils. To emphasize the changes in acoustic cavitation intensity also time-frequency analysis was used and some spectrograms were evaluated. The measurement uncertainty of some frequency-rms voltage pairs was very unfavorable. The main application expected with created cavitation measurement system is to develop a diagnostic tool for the aging of oil, based on the hypothesis that the measured cavitation intensity and spectrum could be affected by aging. Previous published measurements showed some relationship between insulating oil aging process and changes of acoustic emission of cavitations.

Keywords

EN

02.60.Lj; 43.40.Le

Discipline

• 02.60.Lj: Ordinary and partial differential equations; boundary value problems

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 4
• Pages: 744-747

Dates

published

2011-10

Contributors

author

M. Szmechta

• Institute of Electric Power Engineering, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland

author

T. Boczar

• Institute of Electric Power Engineering, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland

author

P. Frącz

• Institute of Electric Power Engineering, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland

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Identifiers

DOI

10.12693/APhysPolA.120.744