Lysytsia M.I., Grebenyuk S.M., Tverdokhlib T.O., Zabolotna O.Yu., Lysytsia N.M. Development of criteria and methods for evaluating the efficiency of application of shock-resistant systems

Details

Parent Category: Geo-Technical Mechanics, 2020

Category: Geo-Technical Mechanics, 2020, Issue 151

Geoteh. meh. 2020, 151, 180-189

DOI: https://doi.org/10.15407/geotm2020.151.180

Development of criteria and methods for evaluating the efficiency of application of shock-resistant systems

¹Lysytsia M.I., ²Grebenyuk S.M., ¹Tverdokhlib T.O., ¹Zabolotna O.Yu., ³Lysytsia N.M.

¹Institute of Geotechnical Mechanics named by N. Poljakov of NAS of Ukraine, ²Zaporizhzhia National University, ³Oles Honchar Dnipro National University

UDC 678.4:539.3

Language: Russian

Abstract.

The paper considers issues of evaluating the effectiveness of shock and vibration protection systems of mining machines.

Technical progress in production is associated with an increase in the intensity of adverse factors caused by an increase in the speed of operations and, as a result, an increase in vibration, noise and shock loads. In terms of the number of diseases associated with vibration, extractive industries occupy one of the leading places among many types of occupational diseases.

In the general spectrum of vibrations of a mining machine, vibrations of various nature can occur: free, forced, parametric, mixed, and others, which is caused by the operation of the executive body, design factors, impact interaction with the medium being processed, and mainly leads to broadband vibration spectra. This creates significant difficulties in creating vibration-proof systems, since there is a need to create standard solutions that, while not strictly optimal, could have acceptable efficiency taking into account loading and working conditions.

The main elements of vibration-isolating systems are supports that isolate the object or system from disturbances. In the structure of such supports, all three principles of vibration isolation can be implemented: reflection, absorption, counteraction. In this case, the goal of shock-vibration isolation is the choice of stiffness and dissipative characteristics of elastic bonds, which will provide the necessary natural frequencies of the protected object.

In this regard, the development of criteria and methods for assessing the effectiveness of various types of shock and vibration protection systems is relevant.

In the work, to evaluate the performance of shock-proof systems, an energy criterion is proposed, which is based on the principle of permissible damage to the protected object. Using this criterion makes it possible to determine the ultimate stiffness of elastic ties depending on the ratio of the colliding masses and the collision time, which can be used, for example, in calculating loading points of belt conveyors. The ultimate efficiency of the vibration protection system with a motion conversion mechanism (MCM) is determined. It is shown that the introduction of such a mechanism into the system makes it possible to increase the protection efficiency by 18-46 % compared with a system without MCM.

Keywords:

shock and vibration protection system, efficiency, energy criterion, motion conversion mechanism

References:

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About the authors:

Lysytsia Mykola Ivanovych, Candidate of Technical Sciences (Ph. D.), Senior Researcher, Senior Researcher in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Grebenyuk Serhii Mykolaiovych, Doctor of Technical Sciences (D. Sc.), Head of the Department of Mathematical Analysis in Zaporizhzhya National University, Zaporizhzhya, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Tverdokhlib Tetiana Omelianivna, Master of Science, Researcher in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Zabolotna Olena Yuriivna, Master of Science, First Category Engineer in Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Science of Ukraine, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Lysytsia Natalia Mykolaiivna, Master of Science, Assistant of computer technologies department, faculty of applied mathematics, Oles Honchar Dnipro National University, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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