Tag Archives: rational parameters

694–703 V. Bulgakov, S. Nikolaenko, I. Holovach, V. Adamchuk, Z. Ruzhуlo and J. Olt
Numerical modelling of process of cleaning potatoes in spiral separator
Abstract |
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Numerical modelling of process of cleaning potatoes in spiral separator

V. Bulgakov¹, S. Nikolaenko¹, I. Holovach¹, V. Adamchuk², Z. Ruzhуlo¹ and J. Olt³*

¹National University of Life and Environmental Sciences of Ukraine, Heroyiv Oborony street 15, UA03041 Kyiv, Ukraine
²National Scientific Centre, Institute for Agricultural Engineering and Electrification, 11, Vokzalna street, Glevakcha -1, Vasylkiv District, UA08631 Kiev Region, Ukraine
³Estonian University of Life Sciences, Institute of Technology, Kreutzwaldi 56, EE51006 Tartu, Estonia
*Correspondence: jyri.olt@emu.ee

Abstract:

Cleaning potato tubers from soil and plant residues after their digging from the soil is a topical problem in the industrial production of potatoes. Taking into account the fact that the cleaning spirals are positioned with overlapping and rotate in the same sense, the potato tuber that has landed on the surface of the spiral separator in the trough between two adjacent spirals will perform translational motion towards the output ends of the spirals. As a result of solving the said system of equations, the graphical relations between the values of the normal reactions and friction forces generated during the translation of the potato tuber along the mentioned spirals, on the one hand, and the design and kinematic parameters, on the other hand, based on the requirement of not damaging tubers when performing the said work process of transportation and cleaning, have been obtained. The limitations for the normal reactions and friction forces at the points of contact between the tuber and the surface of the cleaning spiral are set in accordance with the requirement that they do not exceed the force of scraping (damaging) the tuber’s external surface permissible for potato tubers. That has provided an opportunity to obtain the rational values of the design and kinematic parameters of the separator’s operating spirals, in particular, the value of the angular velocity of the rotating cleaning spirals as well as their radius and helix lead.

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1590-1606 V. Bulgakov, S. Nikolaenko, M. Arak, I. Holovach, Z. Ruzhуlo and J. Olt
Mathematical model of cleaning potatoes on surface of spiral separator
Abstract |

Mathematical model of cleaning potatoes on surface of spiral separator

V. Bulgakov¹, S. Nikolaenko¹, M. Arak², I. Holovach¹, Z. Ruzhуlo¹ and J. Olt²*

¹National University of Life and Environmental Sciences of Ukraine, Heroyiv Oborony street 15, UA03041Kyiv, Ukraine
²Estonian University of Life Sciences, Institute of Technology, Kreutzwaldi 56, EE51006 Tartu, Estonia
*Correspondence: jyri.olt@emu.ee

Abstract:

Cleaning potato tubers from soil impurities and plant debris after digging them out of soil is a topical problem in the work process of potato production. Therefore, the engineering of new designs of potato heap separators necessitates the further studying of them and the optimisation of their kinematic and design parameters, which must not only ensure the high quality of cleaning, but also rule out the possibility of damaging the tubers. The aim of this study is to determine the design and kinematic parameters of the improved design of the spiral potato separator, which will ensure the high quality of cleaning and rule out the possibility of damaging the tubers, on the basis of the development of the new theory of potato tuber’s motion on the surface of the separator. An analytical study has been carried out resulting in the construction of the equivalent schematic model of the interaction between the potato tuber and separator, the tuber being approximated by a material point on the surface formed by the two cantilevered spirals, which are the separator’s tools. The separator’s spirals are driven to rotate and at the same time they can perform oscillations in the vertical and axial plane under the action of the varying load generated by the continuous feeding of the potato heap for separation. In the model, the forces acting on the potato tuber’s body are applied to it, the coordinate axes that have been selected and appropriately oriented are shown. A system of equations has been set up for the constructed equivalent schematic model, comprising three differential equations of the potato tuber body’s motion on the surface of the trough formed by the two cantilevered spirals. The determined kinematic and design parameters will allow to raise the quality of cleaning potato tubers from soil impurities and plant debris.

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52-63 V. Bulgakov, S. Nikolaenko, V. Adamchuk, Z. Ruzhуlo and J. Olt
Theory of impact interaction between potato bodies and rebounding conveyor
Abstract |

Theory of impact interaction between potato bodies and rebounding conveyor

V. Bulgakov¹, S. Nikolaenko¹, V. Adamchuk², Z. Ruzhуlo¹ and J. Olt³*

¹National University of Life and Environmental Sciences of Ukraine, 15, Heroyiv Oborony Str., UA03041 Kyiv, Ukraine
²National Scientific Centre, Institute for Agricultural Engineering and Electrification, 11, Vokzalna Str., Glevaкha-1, Vasylkiv District, UA08631 Kiev Region, Ukraine
³Estonian University of Life Sciences, Institute of Technology, Kreutzwaldi 56, EE51014 Tartu, Estonia
*Correspondence: jyri.olt@emu.ee

Abstract:

In order to increase substantially the quality of the potato heap separation, it is necessary to carry out the theoretical substantiation of the spiral separator’s parameters with regard to the impact interaction between the product and the tools of the unit under the condition of not damaging the tubers. An equivalent schematic model of the impact interaction between a potato tuber and the surface of the rebounding conveyor has been devised. Taking into account the coefficient of restitution of the tuber’s velocity in case of an impact, new analytical expressions have been obtained for determining the magnitude and direction of the potato tuber’s velocity after the impact. They provided the basis for applying the principle of momentum at impact and obtaining the analytical expressions that allow determining the impact impulse and impact force at the impact of the tuber on the surface of the rebounding conveyor and, eventually, the dynamic constraints on the permitted velocity of the tuber prior to the impact interaction under the condition of not damaging it. A new analytical mathematical model of the impact interaction of the potato tuber during the potato heap separation has been developed. On the basis of the obtained theoretical results, studies have been carried out on the rational kinematical parameters of the high-quality performance of the above-mentioned work process under the condition of keeping the potato tubers undamaged.

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