Lysytsia M.I., Ahaltsov H.M., Lysytsia N.M., Novikova A.V. On the effect of the direction of external load application upon the change in stiffening behavior of rubber vibration isolators

Details
Parent Category: Geo-Technical Mechanics, 2020
Category: Geo-Technical Mechanics, 2020, № 151

Geoteh. meh. 2020, 151, 121-127

  DOI: https://doi.org/10.1051/e3sconf/201910900053

On the effect of the direction of external load application upon the change in stiffening behavior of rubber vibration isolators

1Lysytsia M.I., 1Ahaltsov H.M., 2Lysytsia N.M., 1Novikova A.V.

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

UDC 678.4:539.3

Language: English

Abstract.

Currently used elements of the elastic suspension of machines are very diverse both in form and in their functional purpose. According to the purpose, the elastic elements are divided: into the main ones – they are an element of the structural-dynamic scheme of the machine, determine the operating mode; supporting – determine the kinematics of movement of the working bodies and the design of the machine, are used to connect the working body to the base; isolators – provide a reduction in dynamic loads on foundations, floors, support structures, reduce harmful vibrations in the workplace and noise in the production areas; buffers – elastic elements installed with a gap and working in shock mode, are used to stabilize the operating mode of a vibrating machine in extreme conditions and in transient regimes. It should be noted that the elastic suspension elements of vibrating machines can simultaneously perform several functions: to be basic and supportive, supportive and anti-vibration, etc.

All of the above determines the role of the elastic link in the overall structural scheme of the vibrating machine, determines its power and dissipative characteristics and, as a result, its design and material choice.

Vibration isolating systems using elastomeric structures based on rubber as the main, supporting and vibration isolating elements are widely used both in Ukraine and abroad. The most common in practice are elastic elements in the form of solid or hollow rubber cylinders with various shapes of the free surface. The curved shape of the inner and outer surfaces provides an increased heat sink area and allows to create elements of lower height with the same amount of vertical stiffness. The question of determining the stiffness characteristics of such rubber elements depending on the conditions of their loading and fastening remains poorly studied.

The rubber elements of type V-101, V-102 and V-103 were tested. The tests were carried out in two stages: first stage – shear forces were determined when the relative deformation value was changed; the second stage is the determination of the change in the stiffness characteristics of the rubber element depending on the direction of the external load and the conditions of its fixing. Experimental studies were performed using special tools and standard measuring equipment.

It has been established: the loss of stability of power rubber elements with relative deformations of more than 10‑15 % occurs due to a sharp decrease in shear stiffness; the angle of application of the external load on the rubber vibration isolator, the method of fixing the rubber vibration isolator, significantly changes its stiffness characteristics.

Considering the changes in stiffness characteristics of cylindrical vibration isolators, depending on the angle of application of the external load, allows not only to expand their field of application, but also to reduce the range of manufactured ones.

Keywords:

cylindrical rubber vibration isolator, stability, stiffness characteristics

References:

1.   Vaysberg, L.A. (1986), Proyektirovaniye i raschet vibratsionnykh grokhotov [Design and calculation of vibrating screens], Nedra, Moskow, USSR.

2.   Poturayev, V.N. and Dyrda, V.I. (1977), Rezinovyye detali mashin [Rubber machine parts], Mashinostroyeniye, Moscow, USSR.

3.   Bulat, A.F., Dyrda, V.I., et al. (2016), Elastomery v gornom dele [Elastomers in mining], Naukova dumka, Kyiv, Ukraine.

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.

Ahaltsov Hennadii Mykolaiovych, Master of Science, Junior Researcher of 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.

Novikova Alina Viacheslavivna, Master of Science, Junior Researcher of 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.