Issue №: 2(117)
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.
ОN THE CHANGE OF EFFECTIVE DRY FRICTION COEFFICIENTS DURING VIBRATION OF NESTED STRUCTURES
Kovtun Anatoly Candidate of Technical Sciences, Associate Professor Department of Logistics Management National Academy of National Guard of Ukraine (Defenders of Ukraine Square, 3, Kharkiv, 61001, Ukraine) e-mail: kav-60@ukr.net; ORCID ID: https:// https:ORCID.ORG/0000-0002-8427-1005. Моб. +38(097) 708-04-41.
The article investigates the vibration effects that arise when vibration acts on mechanical systems, the constituent elements of which are interconnected by dry friction forces, which lead to changes in the properties and behavior of the system. Such structures, some of the constituent elements of which are located inside the others and are interconnected, at least on two opposite surfaces, by dry friction forces are called nested. Nested structures are found quite often in modern technology: transportation of goods, fastening of pipelines, braking devices of machines, etc. The object of the study is the effect of changing the effective coefficients of dry friction in the process of interaction of the constituent elements of nested structures, when forced vibrations act on them.
Based on the method of mathematical modeling, new analytical relationships were obtained for determining the effective coefficients of dry static friction between the elements of nested structures. As a result of conducting research on the processes of interaction of the constituent elements of nested structures under the action of forced vibrations on the structures, a new effect of changing the effective coefficients was determined coefficients of dry friction between them. The results of the study allow us to conclude that that nested structures are characterized by a special dependence of the effective coefficients of dry friction on the frequency of forced oscillations, which consists in the fact that with an increase in the frequency of forced oscillations, the effective coefficients of dry friction at rest between the elements of nested structures tend to a finite value (non-zero), in contrast to the classical calculation scheme, when the body is in contact with a vibrating plane with one surface. By changing the value of the frequency of the external action, it is possible to achieve a change in the value of the effective coefficient of dry static friction, which reflects the final result of the interaction of the contacting surfaces that perform periodic movements.
The conducted experimental studies confirmed the dependence of the effective dry friction coefficients of nested structures on the frequency of forced oscillations.
The results obtained can be used in the creation of vibration systems for moving loads over distances exceeding the capabilities of existing vibration systems.
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About the journal
The journal "Vibrations in Engineering and Technologies" is included in the list of technical scientific publications of Ukraine
(Category "B", Order of the Ministry of Education and Science of Ukraine dated July 2, 2020 No. 886)
Old version of the site: http://vibrojournal.vsau.edu.ua/
The journal "Vibrations in Engineering and Technology" is indexed by the following databases and catalogs:
The certificateof massmedia State registration:kv no 16643-5115 from 30.04.2010 .
Founder of the journal: Vinnytsia National Agrarian University
The journal is devoted to highlighting current issues in engineering, mechanical engineering, and technological processes, including the study of dynamic and oscillatory phenomena in technical systems, the application of mathematical methods for process modeling and analysis, as well as the presentation of results of design-engineering and technological developments. Particular attention is given to the study of vibration processes and their application in modern technologies.
The purpose of the scientific journal “Vibrations in Engineering and Technologies” is to disseminate the results of fundamental and applied research in the field of engineering sciences aimed at developing theoretical foundations and practical approaches to the design, analysis, and improvement of machines, materials, and technological processes, including the use of vibration and oscillatory effects in various sectors of production.
The publication is focused on the formation of a modern scientific and informational environment for the effective exchange of research results, support of innovative development, and implementation of advanced technical solutions in industry, agro-industrial production, and related fields.
The journal promotes the development of interdisciplinary research, the integration of modern engineering approaches, and the enhancement of the efficiency of technological processes and technical systems, including through the rational use of vibration phenomena.
Objectives of the Scientific Journal
To achieve its stated purpose, the journal addresses the following key objectives:
dissemination of results of fundamental and applied scientific research in the fields of mechanics, mechanical engineering, technological processes, machine dynamics, and equipment, as well as in areas related to the application of vibration phenomena in engineering and technologies;
promotion of research aimed at the creation and improvement of machines, mechanisms, and technological equipment based on oscillatory and vibration processes;
support for the implementation of modern technological solutions focused on improving productivity, energy efficiency, and reliability of technical systems;
обеспечение scientific exchange of research results among research institutions, higher education establishments, and industrial enterprises;
development of interdisciplinary cooperation among researchers in the fields of mechanics, materials science, material processing technologies, and automation of technological processes;
dissemination of modern scientific achievements and advanced technologies related to the application of vibration processes in production and technical systems.
Publisher Vinnytsia National Agrarian University
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 119 issues wherestudy of vibration effects, the creation of progressive energy saving technologies and equipment for their implementation were highlighted.
Currently Ihor Kupchuk, Candidate of Technical Sciences, Associate professor, Associate Professor of the Department of Engineering Mechanics and Technological Processes in the Agricultural Industry Faculty of Engineering and Technology Vinnytsia National Agrarian University 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.
