logo

Vibrations in engineering and technology

space SCIENTIFIC JOURNALS OF VINNITSA NATIONAL AGRARIAN UNIVERSITY

Issue №: 2(101)

Published: 2021.06.29
DOI: 10.37128/2306-8744-2021-2


Description:
The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.

Read about journal

THE USE OF DISCRETE WAVELET ANALYSIS OF VIBRO-ACOUSTIC SIGNALS TO DETECT THE POWER SUPPLY ASYMMETRY OF ROTATING ACCOMPANYING ELECTRIC MACHINES

DOI: 10.37128/2306-8744-2021-2-7
PDF Повернутись

Graniak Valeriy Fedorovich - Candidate of Science (Engineering), Associate Professor, Associate Professor of the Department of Power engineering, electrical engineering and electromechanics of Vinnitsa National Agrarian University . (3 Soniachna St., Vinnitsa, Ukraine, 21008, e-mail: titanxp2000@ukr.net)

Gaidamak Oleg Leonidovich - Candidate of Science (Engineering), Associate Professor, Associate Professor of the Department of Power engineering, electrical engineering and electromechanics of Vinnitsa National Agrarian University . (3 Soniachna St., Vinnitsa, Ukraine, 21008, e-mail: haidamak@vsau.vin.ua)

 

 

 

Annotation

The work shows that among the existing sufficiently described and studied approaches that are suitable for analyzing the temporal realization of a vibosignal, which can be obtained during the operation of a real electric machine, one can single out Fourier transforms and discrete wavelet transformations. An analysis of the descriptions of vibro-acoustic signals given in the literature, caused by the asymmetry of the power supply, shows that this defect leads to the appearance of oscillations that contain a harmonic component localized at the frequency of the supply voltage of the electrical network. This fact justifies the expediency of analyzing the frequency range, which includes the frequency of the supply voltage, and the selection of the mother wavelet, based on the features inherent in a single harmonic oscillation.

A method for detecting a defect in the asymmetry of power supply to rotating electric machines of alternating current using a discrete wavelet transformation of a vibro-acoustic signal is proposed. The frequency band has been established, which is advisable to analyze in order to identify the indicated defect.

It was found that the detection of a power asymmetry defect with the use of the wavelet transform of the temporal realization of the vibroacoustic signal is advisable to carry out using the Haar maternal wavelet function, which provides a combination of a high degree of affinity of the maternal wavelet with the form of vibration change due to the introduced asymmetry and relative the simplicity of such a transformation.

It is shown that when detecting power asymmetry, it is advisable to analyze the behavior of the wavelet coefficients of the frequency band, which includes the frequency of the supply voltage of the electric machine. Since the influence of the indicated defect on other frequency bands will be minimal, the analysis of the behavior of their wavelet transform coefficients in order to identify the indicated defect is ineffective.

A numerical criterion for assessing the influence of power asymmetry on the wavelet transform coefficients is proposed in the form of the mean square value of the wavelet coefficients of the informative frequency band in the study of the time interval, which significantly exceeds the period of the supply voltage of the electric machine. It is shown that this criterion has a reduced sensitivity to the impact of non-informative single disturbances that may arise during the operation of an electric machine. Keywords: electric machine, rotor unbalance, defect, burst, wavelet transform.

 

Keywords: electric machine, asymmetry, defect, burst, wavelet transform.

List of references

1. Levitsky A.S. ( 2010). Improving the efficiency of diagnosing powerful hydraulic units through the use of capacitive meters for the parameters of mechanical defects. Hydropower of Ukraine. [in Ukrainian].

2. Hraniak V. F., Kukharchuk V. V., Kucheruk V. Y. and other. (2018) Using in-stantaneous cross-correlation coefficients of vibration signals for technical condition monitoring in rotating electric power machine. Bulletin of the Karaganda University. «Physics» series.  [in English].

3. Shirman A.R., Solovyov A.B. (1996) Practical vibration diagnostics and monitoring of mechanical equipment. Moscow: Mashinostroenie. [in Russian].

4. Kukharchuk V.V, Katsiv S. Sh., Granyak VF and others. (2018)Discrete wavelet transforms in the diagnosis of hydraulic units. Monograph. Vinnytsia. [in Ukrainian].

5. Vorobyov V.I., Gribunin V.G. (1999) Theory and practice of wavelet transform. St. Petersburg: VSU. [in Russian].

6. Kiselyov Y.U., Kiselyov D. Yu., Titz S.N. (2012) Vibration diagnostics of systems and structures of aviation equipment. Textbook. Samara: Samar Publishing House, Gos. Aerospace, University. [in Russian].

7. Broughton S. A., Bryan K. (2008) Discrete fourier analysis and wavelets : ap-plications to signal and image processing. New Jersey: John Wiley & Sons, Inc. [in English].

8. Polikar R. (2001) The Wavelet tutorial. Roma: Rowan University, College of Engineering Web Servers. [in English].

9. Addison P. S. (2002) The Illustrated Wavelet Transform Handbook. Introduc-tory Theory and Applications in Science, Engineering, Medicine and Finance. Edin-burgh: Napier University. [in English].

 

All journal issues

About journal

Topics of the journal:

The journal "Vibrations   in engineering  and technology" presents materials on the following issues

• Theory of processes and machines
• Mechanical Engineering and materialprocessing
• Processing and food production

Key information:
ISSN (print): 2306-8744
DOI: 10.37128/2306-8744

The certificateof massmediaState registration:kv no 16643-5115 from 30.04.2010 .
Founder of the journal: Vinnytsia National Agrarian University

Kind of publication: journal
Type of publication : Scientific
Publication status: Domestic
Year of founding:
Periodicity: 4 times a year
Extent: 18.75 nominal printed pages
ISSN: 2306-8744 (printed version), (online)
Language of edition  : (mixed languages) Ukrainian, English
The scope of the distribution and the category of readers: national, foreign, teaching staff, scientists, businessmen.
Periodical is included in the list of scientific professional editions of Ukraine approved by the Order of Ministry of Education and Sciences of Ukraine from 21.12.2015 No. 1328.
The journal "Vibrations in engineering and technology" is included in the "Catalogue of periodicals of Ukraine".
Journal subscription can be executed in each post office department.
 Subscription Index is  99720.

 

Old version of site: http://vibrojournal.vsau.edu.ua/

History of journal:

In June 1994 the 2nd International Scientific and Technical Conference "Application of vibrations for technological purposes" was organized on the basis of Vinnytsia State Agricultural Institute. Leading experts in this field, noting the significant contribution to the school of Vibration Engineering under the leadership of P. S. Bernyk, proposed to create a professional all-Ukrainian scientific and technical journal "Vibration in engineering and technology..The journal was foundedat Vinnytsia State Agricultural Institute and P.S. Bernyk was elected to be the chief editor .
For all these years (since 1994) theJournal "vibration in engineering and technology" published  94 issues wherestudy of vibration effects, the creation of progressive energy saving technologies and equipment for their implementation were highlighted.
Currently Kaletnik H.M  PhD , professor, academician NAAS is the chief editor of the "Vibrations in engineering  and Technology"
The journal "Vibration in Engineering and technology", which has no analogues on the territory of Ukraine, is well known abroad.