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Vibrations in engineering and technology

space SCIENTIFIC JOURNALS OF VINNITSA NATIONAL AGRARIAN UNIVERSITY

Issue №: 1(96)

Published: 2020.09.01
DOI: 10.37128/2306-8744-2020-1


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.

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DIAGNOSTICS OF STRUCTURAL DAMAGE BASED ON THE NATURAL FREQUENCIES RATIO CHANGE

DOI: 10.37128/2306-8744-2020-1-2
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Bovsunovsky Anatoliy Petrovich – Doctor of Technical Sciences, Professor, Professor of Department of Machines and Apparatus for Food and Pharmaceutical Production, National University of Food Technologies (Volodymyrska str., 68, Kyiv, Ukraine, 01601: e-mail: apbovsunovsky@gmail.com).

Surace Cecilia – Philosophy Doctor, Professor, Department of Structural Geotechnical and Building Engineering, Politecnico di Torino (Сorso Duca degli Abruzzi 24, Torino, Italy,10129; e-mail: cecilia.surace64@gmail.com).

Annotation

The problems of vibration diagnostics based on the change of natural frequencies of structures are connected with the influence of ambient and operational factors (temperature, humidity, wind, heavy traffic etc.) on the natural frequencies. In some cases, this effect is comparable with the effect of damage itself and reliable diagnostics of damage becomes problematic. To solve this problem, the use of the ratio change between natural frequencies of different mode shapes is proposed as a characteristic of damage. The study has demonstrated that this ratio is unaffected by the environmental and operational factors. Application of the proposed method is illustrated using the example of Z24 reinforced concrete bridge. As the characteristic feature of the reinforced concrete structures damage is the occurrence of multiple cracks, in the analytical model, apart from the size and location of the cracks, the possibility of several locally located cracks was taken into account.The analytical study was performed to calculate the mode shapes and natural frequencies of damaged multi-span beam-like structure. The results reveal that, in order to identify local damage of subcritical size, natural frequency data of at least four modes of vibration are necessary. The eigenfrequencies obtained experimentally in the study of the Z24 bridge were used to confirm that the change in the eigenfrequency ratio can be used to diagnose relatively small local defects in complex structures. At this the reliability of such vibration diagnostics is much higher than based on the change of natural frequencies and mode shapes, since the change in the ratio of natural frequencies does not depend on the environmental conditions and operating conditions of the structure.

Keywords: vibration diagnostics, local damage, environmental conditions, operational conditions, natural frequencies ratio; bridge structures.

List of references

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2. Moser P., Moaveni B. (2011). Environmental effects on the identified natural frequencies of the Dowling Hall Footbridge. Mechanical systems and signal processing, 25, 2336–2357.

3. Cross E.J., Koo K.Y., W.Brownjohn J.M., Worden K. (2013). Long-term monitoring and data analysis of the Tamar Bridge. Mechanical systems and signal processing, 35, 16–34.

4. Samir N. Shoukry, Gergis W. William, Mourad Y. Riad. (2009).Effect of moisture and temperature on the mechanical properties of concrete. Proc. of the SEM Annual Conference, Albuquerque, New Mexico, USA, 1–9.

5. Farrar C.R., Doebling S.W., Cornwell P.J. (1997). Variability of modal parameters measured on the Alamosa Canyon Bridge. Proc. of the 15th IMAC, Orlando, Florida, USA, 257–263.

6. Peeters B., De Roeck G. (2001). One-year monitoring of the Z24-bridge: environmental effects versus damage events. Earthquake engineering and structural dynamics, 30, 2, 149–171.

7. Kim C., Jung D., Kim N. (2003). Effect of vehicle weight on natural frequencies of bridges measured from traffic-induced vibration. Earthquake engineering, 2, 1, 109–115.

8. Farrar C.R., Worden K. (2013). Structural health monitoring: a machine learning perspective. John Wiley & Sons, Ltd.

9. Sinou J.J. (2007). Damage assessment based on the frequencies’ ratio surfaces intersection method for the identification of the crack depth, location and orientation. Structural durability and health monitoring, 3, 3, 134–162.

10. Maeck J., De Roeck G. (2003). Description of Z24 benchmark. Mechanical systems and signal processing, 17, 1, 127–131.

11. Ananiev I.V. (1946). Spravochnik po raschiotu sobstvennyh kolebaniy uprugih system [Handbook for calculation of natural vibrations of elastic systems]. Moscov-Leningrad: Gostekhteorizdat. [in Russian].  

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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
Chief editor
Kaletnik Hryhorii Mykolaiovych
Ph.D., Prof., academician of NAAS, VNAU (Vinnytsia)
Chief Editor Deputy
V.V.Adamchuk
DsCProf., NSC IMEG NAAS of Ukraine (Kyiv)
Executive Secretary
Solona Olena
Ph.D., Assoc., VNAU (Vinnytsia)
Members of the editorial board
Bulgakov V.M.- Doctor of Technical Sciences, Professor, Acad.NAAS, National University of Life and Environmental Sciences of Ukraine
Veselovskaya N.R.- Doctor of Technical Sciences, Professor, Vinnytsia National Agrarian University
Derevenko A.I.- Ph.D., Associate Professor, Vinnytsia National Agrarian University
Zinkovsky A.P.- Doctor of Technical Sciences, Professor, the Institute of Strength Problems named after H.S.Pysarenko, NAS of Ukraine
Iskovych-Lototskyi R.D.- Doctor of Technical Sciences, Professor, Vinnytsia National Technical University
Kupchuk I.M.- Ph.D, Senior Lecturer, Vinnytsia National Agrarian University
Nadutyi V.P. - Doctor of Technical Sciences, Professor, Geotechnical Mechanics Institute named after  PolyakovM.S. NAS of Ukraine
Matveyeyv V.V.  - Ph.D., Professor, Academician of the National Academy of Sciences of Ukraine, the Institute of Strength Problems named after H.S.PysarenkoNAS of Ukraine
Olshanskyi V.P.  - Ph.D, Professor, Kharkiv National Technical University of Agriculture named after Petro Vasylenko
PoleyvodaYu.A.  - Ph.D., Associate Professor, Vinnytsia National Agrarian University
Spirin A.V.- Ph.D., Associate Professor, Vinnytsia National Agrarian University
Tverdohlib I.V.  - Ph.D., Associate Professor, Vinnytsia National Agrarian University
Tokarchuk O.A.- Ph.D., Associate Professor, Vinnytsia National Agrarian University
Tsurkan O.V.- Ph.D.  Associate Professor., Vinnytsia National Agrarian University
 Jordan Todorov Maksimov - Doctor of Technical Sciences, Prof., Gabrovo Technical University (Bulgaria)
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, Russian, 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.