Some problems of safety of vibrative machines with elastomeric elements

Kobets A.S., Dyrda V.I., Sokol S.P., Tolstenko A.V.

Authors:

Kobets A.S., D. Sc. (Public Administration), Professor (DSAEU),
Dyrda V.I., D. Sc. (Tech.), Professor (IGTM NAS of Ukraine),
Sokol S.P., Ph. D. (Tech.) (DSAEU),
Tolstenko A.V., Ph. D. (Tech.) (DSAEU)

UDC 678.4.06

Language: Russian

Abstract.

The safe functioning of heavy vibration machines is considered with taking into account risk of man-made accidents. Such machines, among which are feeders, screens, conveyors, centrifuges, sieves, etc., often work with long-term cyclic loads, at high and low temperatures, under influence of an aggressive external environment. The article outlines methods for improving vibration safety of such machines by using elastomeric elements as elastic links, assembly compensators and vibration isolators. The basic criteria of the machine vibration safety are stated; such criteria ensure effectiveness of the vibration protection and provide the specified durability of the object. Criteria for vibration safety allow, when certain data are available, to calculate frequency of natural oscillations of the system, carrying capacity of elastic suspension, as well as the basic parameters of elastomeric elements and physical and mechanical characteristics of elastomer. The criteria for elastomeric elements failure and criteria for their destruction are considered. As a criterion of damaged elastomeric elements, an energy criterion of the dissipative type is considered; critical deformations are considered as criterion of destruction when shape of the object changes (i.e. buckling of rubber) and stability of the elastomeric element is lost due to the aging of the material. The criteria are formulated on the example of a cylindrical element whose ends are connected to the metal plates in the process of vulcanization. From the given criterial equations, conditions of transverse (or horizontal) stability of the elastomeric part were set up, i.e. a condition when rubber is not separated from the metal. Vertical stability of the element is provided according to the Euler criterion.

Keywords:

safety, elastomeric elements, vibration criteria, failure criteria, destruction criteria

References:

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1. Frolov, V.K. (ed.) (1981), Vibratsiya v tekhnike [Vibration in engineering], Mashinostroyeniye, Moscow, USSR.

2. Dyrda, V.I., Agaltsov, G.N., Kozub, Yu.G. and Roshchupkin, S.V. (2010), “Vibration isolation of heavy machinery with rubber elements”, Geo-Technical Mechanics, no. 86, pp. 171-195.

3. Dyrda, V.I. (1988), Prochnost’ i razrusheniye elastomernykh konstruktsiy v ekstremal’nykh usloviyakh [Strength and destruction of elastomeric structures in extreme conditions], Naukova dumka, Kiev, USSR.

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About the authors:

Kobets Anatoliy Stepanovych,Doctor of Public Administration, Professor, Rector, Dnipropetrovsk State University of Agriculture and Economics, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Dyrda Vitaly Illarionovich, Doctor of Technical Sciences (D. Sc.), Professor, Head of Department of Elastomeric Component Mechanics in Mining Machines, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Sokol Sergey Petrovich, Candidate of Technical Sciences (Ph. D.), Senior Teacher of Dnepropetrovsk State Agrarian and Economic University (DSAEU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tolstenko Alexandr Vasil’yevich, Candidate of Technical Science (Ph. D.), Associate Professor of Department «Reliability and repair of machinery», Dnepropetrovsk State Agrarian and Economic University (DSAEU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.