Vibrations in engineering and technology

Kobets Anatoliy – Doctor of Public Administration, Professor, Rector, Dnipro state agrarian-economic university, S. Efremova Str. , 25, 49600, Dnipro, Ukraine.

Dyrda Vitaly – Doctor of Technical sciences, professor, Head of Department of  Еlastomeric component Mechanics in Mining Machines, M.S. Polyakov Institute of Geotechnical Mechanics under the NAS of Ukraine, Simferopolskaya Str., 2а, Dnipro, Ukraina, e-mail: vita.igtm@gmail.com.

Sokol Sergey –  Candidate of Technical Science (Ph. D.) Dnipro state agrarian-economic university, 

S. Efremova Str. , 25, 49600, Dnipro, Ukraine.

Cherniy Alexandr – Senior Teacher of  Department «Reliability and repair of machines», Dnipro state agrarian-economic university, S. Efremova Str. , 25, 49600, Dnipro, Ukraine, e-mail: sanek20.1984@gmail.com.

One of the indicators of the efficiency of the technological process is the use of transporting machines with high technical and economic characteristics, as well as high indicators of operational reliability and durability. In practice, the design of machines for the transport of goods has proved to be very good, that vibration is used in the process. In this article, vibration tube conveyors of the KV2T type are considered. Thanks to their advantages, these machines successfully cope with the tasks set, being part of the technological lines of transportation, separation, drying, cooling of useful cargoes at the enterprises of the metallurgical, chemical, construction and other branches of the national economy. Since this is a resonant system, the question of the invariance of the parameters of vibration in time is very important. Long-term experience of using vibrating conveyors has shown that in the form of an elastic link they use rubber-metal elements, which are characterized by a non-linearity of damping properties. In this case, it is important to take into account all the rheological characteristics of rubber when describing the dynamics of the machine.  The main factor that changes the rigidity parameters of elastic elements, in studies is determined the ambient temperature in which the machine operates. For the operating range, the ambient temperature was assumed to be below zero degrees. Using the deduced formula for determining the amplitude, a curve is constructed for the dependence of the amplitude of the oscillations on the lowered ambient temperature. Practical measurements of the oscillation amplitude of the system at low ambient temperatures show good convergence with the theoretical dependence.

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