Determination of stresses and strains in the shaping structure under spatial load

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.147195

Keywords:

computational model, shaping structure, spatial load, stress-strain state, concrete mix

Abstract

The computational model of the machine – environment system, taking into account the mutual influence of the working body and compaction mixture was developed. It is based on the condition of determining the contact forces of interaction between the subsystems and estimation of the ratio of the time of action and time of wave propagation. This approach is new, since it takes into account the real relationship between the dynamic parameters of the machine and the environment and degree of interaction. The study and determination of stresses and strains in time confirmed the hypothesis of their significant influence on the process. A fundamentally new result was revealed, which consists in the fact that the transition process should take into account the determination of parameters and locations of vibrators. The laws of stress and strain variations during spatial oscillations of the shaping surface were established. Modes of natural oscillations of the system are implemented with higher oscillation amplitudes and correspondingly lower frequency. And this opens up a real opportunity to reduce the energy intensity of the vibration machine. Numerical values of stresses and the nature of their distribution in the shaping surface, depending on the angle of the instantaneous action of the external force of vibrators, the presence of bending and torsional oscillations were obtained.

So under the condition of two excitation forces, the points of application of which are displaced relative to each other by ½ of the length of the structure, placing the force application points symmetrically at a distance of ¼ of the size of the structure on both sides allowed obtaining cophased and anti-phase directions of stresses and acting external force.

In calculations of vibration machines using shaping surfaces, it was proposed to take into account output numerical values of the amplitude-frequency mode of the oscillation exciter. Practical recommendations for the rational design of sections of shaping structures were developed and technological parameters were determined. To construct such shaping structures, the installation sites for vibrators were determined. The results obtained can be successfully used in related processes, for example, in the mining industry, as active surfaces for ore transportation, for the transfer of suspensions and solutions in the chemical industry

Author Biographies

Ivan Nazarenko, Kyiv National University of Construction and Architecture Povitroflotskyi аve., 31, Kyiv, Ukraine, 03037

Doctor of Technical Sciences, Professor, Head of Department

Department of machinery and equipment of technological processes

Viktor Gaidaichuk, Kyiv National University of Construction and Architecture Povitroflotskyi аve., 31, Kyiv, Ukraine, 03037

Doctor of Technical Sciences, Professor, Head of Department

Department of theoretical mechanics

Oleg Dedov, Kyiv National University of Construction and Architecture Povitroflotskyi аve., 31, Kyiv, Ukraine, 03037

PhD, Associate Professor

Department of machinery and equipment of technological processes

Oleksandr Diachenko, Kyiv National University of Construction and Architecture Povitroflotskyi аve., 31, Kyiv, Ukraine, 03037

Postgraduate student

Department of machinery and equipment of technological processes

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Published

2018-11-13

How to Cite

Nazarenko, I., Gaidaichuk, V., Dedov, O., & Diachenko, O. (2018). Determination of stresses and strains in the shaping structure under spatial load. Eastern-European Journal of Enterprise Technologies, 6(7 (96), 13–18. https://doi.org/10.15587/1729-4061.2018.147195

Issue

Vol. 6 No. 7 (96) (2018): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2018 Ivan Nazarenko, Viktor Gaidaichuk, Oleg Dedov, Oleksandr Diachenko

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