Lysytsia M.I., Tverdohklib T.O., Zabolotna O.Yu., Lysytsia N.M., Novikova A.V. Rubber vibroinsulators of cylindrical form, applicability limits and the expansion of their use area

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 144

Geoteh. meh. 2019, 144, 117-125

https://doi.org/10.15407/geotm2019.144.117

Rubber vibroinsulators of cylindrical form, applicability limits and the expansion of their use area

1Lysytsia M.I., 1Tverdohklib T.O., 1Zabolotna O.Yu., 2Lysytsia N.M., 1Novikova A.V.

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

UDC 678.4:539.3

Language: Russian

Abstract.

The specific behavior of power cylindrical rubber parts is considered depending on the conditions of their loading and fixation.

The principal feature of vibrotransport machines is that, when used in their drive, the nature of the vibrational motion, the amplitude and shape of the trajectories of the working body is determined solely by the following factors - the force effect (driving force), the number and mass of moving elements, the number, location and characteristics of elastic elements.

At present, vibratory transport machines use elastic ties in the form of steel springs or in the form of rubber and rubber-metal parts. Pneumo-elastic connections are rarely used. Elastic ties of vibrotransport machines also differ in the type of deformation experienced by elastic elements, and are subdivided into working for compression, bending, shear. Steel springs in most cases work for torsion, bending and compression, rubber and rubber-metal parts – for compression, shear and shear with compression.

Each of these types of elastic bonds, depending on the type and mode of deformation, the material has its own inherent elastic properties, which impose specific features on the choice and calculation of stiffness parameters.

Determination of the actual stiffness characteristics of elastic ties is an important task for the calculation, the correctness of the solution of which in many respects determines the operation of the vibrating transport machine itself and the performance of a preassigned technological process.

The most widely used in practice are elastic elements in the form of solid or hollow rubber cylinders with different shapes of the free surface. The curvilinear shape of the inner and outer surfaces provides an increased area of heat sink and allows you to create elements of lesser height with the same value of the stiffness coefficient. However, the question of determining the stiffness characteristics of cylindrical rubber elements depending on the conditions of their loading and fixation remains poorly studied.

Tests were performed on rubber elements of the type VR. 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.     1.  Bulat, A.F., Dyrda, V.I. and Zvyagilskiy, Ye.L. (2016), Elastomery v gornom dele [Elastomers in mining], Naukova dumka, Kiev, Ukraine.
  2.     1.  Lisitsa, N.N. (2009), “Development and calculation of rubber vibration isolators for low-frequency vibration isolation of machines”, Geo-Technical Mechanics, no. 84, pp. 189-200.
  3.     2.  Poturayev, V.N. (1966), Rezinovyye i rezino-metallicheskiye detali mashin [Rubber and rubber-metal machine parts], Mashinostroyeniye, Moscow, USSR.

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 NAS of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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

Lysytsia Natalia Mykolaivna, Master of Science, Assistant of computer technologies department, faculty of applied mathematics, Oles Honchar Dnipro National University (Oles Gonchar DNU), 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 NAS of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.