Tag Archives: oscillation

369-384 V. Bulgakov, I. Holovach, V. Adamchuk, S. Ivanovs, V. Melnik, Ye. Ihnatiev and J. Olt
Research into geometric parameters of digging shares used for lifting sugar beet roots from soil with assistance of vibration
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Research into geometric parameters of digging shares used for lifting sugar beet roots from soil with assistance of vibration

V. Bulgakov¹, I. Holovach¹, V. Adamchuk², S. Ivanovs³, V. Melnik⁴, Ye. Ihnatiev⁵ and J. Olt⁶*

¹National University of Life and Environmental Sciences of Ukraine, 15 Heroyiv Oborony Str., UA 03041 Kyiv, Ukraine
²National Scientific Centre, Institute for Agricultural Engineering and Electrification, 11 Vokzalna Str., Glevakcha 1, Vasylkiv District, UA 08631 Kyiv Region, Ukraine
³Latvia University of Life Sciences and Technologies, 2 Liela Str., LV 3001 Jelgava, Latvia
⁴Kharkiv Petro Vasylenko National Technical University of Agriculture, 44 Alchevskih Str., UA 61002 Kharkiv, Ukraine
⁵Dmytro Motornyi Tavria State Agrotechnological University, 18B, Khmelnytsky Ave, UA 72310, Melitopol, Zaporozhye Region, Ukraine
⁶Estonian University of Life Sciences, Institute of Technology, 56 Kreutzwaldi Str., EE5 1006Tartu, Estonia
*Correspondence: jyri.olt@emu.ee

Abstract:

One of the important conditions in securing the high quality, when performing the work process of vibrational root lifting, is to avoid damaging the roots. It is obvious that the greatest probability of damaging and even breaking the lifted root arises, when the tool interacts with the root body during their first contact and in the time of the root passing in the throat between the operating shares. The aim of the study is to substantiate the rational design length for the working throat of the vibrational root lifter in its interaction with the sugar beet root while lifting the latter from the soil. As a result of the completed research, the minimum permissible tool oscillation frequencies have been determined for the specific values of the lifter’s translational velocity and the working throat rear part length, at which the event of the vibrational lifting tool gripping the root will occur at least one time. For example, when the length of the lifter’s working throat rear part is equal to 0.1 m and the oscillation frequency is equal to ν = 20.3 Hz, the satisfactory quality of the vibrational root lifting process is ensured, when the velocity of the translational motion performed by the vibrational lifter stays within the range of 1.3–2.55 m s–1. In order to ensure the good quality of the vibrational root lifting process at the lifter’s translational velocity equal to V = 2.0 m s–1 and the frequency of its tool’s oscillations equal to ν = 10 Hz, it is necessary that the length of the lifter’s working throat rear part is equal to 0.2 m, at a tool oscillation frequency of 6.7 Hz – 0.3 m. As a result of the completed numerical calculations, the permissible values have been determined for the tool oscillation frequency, which can be recommended for the translational velocities within the range of 1.3–2.2 m s–1,
taking into account the limitation set for the tool oscillation frequency by the pre-condition of the guaranteed gripping of each root by the digging shares.

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2340-2352 V. Bulgakov, I. Holovach, V. Nadykto, O. Parakhin, H. Kaletnik, L. Shymko and J. Olt
Motion stability estimation for modular traction vehicle-based combined unit
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Motion stability estimation for modular traction vehicle-based combined unit

V. Bulgakov¹, I. Holovach¹, V. Nadykto², O. Parakhin², H. Kaletnik³, L. Shymko¹ and J. Olt⁴*

¹National University of Life and Environmental Sciences of Ukraine, Ukraine, 15 Heroyiv Oborony Str., UA 03041 Kyiv, Ukraine
²Dmytro Motornyi Tavria State Agrotechnological University, 18B, Khmelnytsky Ave, UA 72310, Melitopol, Zaporozhye Region, Ukraine
³Vinnytsia National Agrarian University of Ukraine, 3 Soniachna Str., UA 21008 Vinnytsia, Ukraine
⁴Estonian University of Life Sciences, Institute of Technology, 56 Kreutzwaldi Str., EE 51006 Tartu, Estonia
*Correspondence: jyri.olt@emu.ee

Abstract:

One of the promising ways of efficiently applying high power intensity tractors is their design and utilisation in the form of modular traction vehicles comprising two modules: the power module and the process module. In order to provide for the sufficient manoeuvrability of the modular traction vehicle, when its process module passes a turn, the latter is equipped with vertical and horizontal hinge joints. The freedom of the process module’s rotation with respect to the power module in the horizontal plane through the agency of the above-mentioned vertical hinge joint is restrained by a hydraulic cylinder, in which the chambers above and below the piston are connected via a throttle valve with a hydraulic resistance coefficient of about 1.03×106 N m s rad–1. This paper is concerned with the theoretical and experimental research into the stability of motion (on turn spaces as well as in the transport mode) of a modular combined unit, when its velocity changes and/or the slip resistance coefficient of the tyres on the wheels of the process module, in which the hydraulic cylinder is equipped with a throttle valve with the above-mentioned hydraulic resistance coefficient, changes.

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689–710 V. Bulgakov, V. Adamchuk, M. Arak, V. Nadykto, V. Kyurchev and J. Olt
Theory of vertical oscillations and dynamic stability of combined tractor-implement unit
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Theory of vertical oscillations and dynamic stability of combined tractor-implement unit

V. Bulgakov¹, V. Adamchuk², M. Arak³, V. Nadykto⁴, V. Kyurchev⁴ and J. Olt³*

¹National University of Life and Environmental Sciences of Ukraine, 15, Heroyiv Oborony Str., UK 03041 Kyiv, Ukraine
²National Scientific Centre, Institute for Agricultural Engineering and Electrification, 11, Vokzalna Str., Glevaкha-1, Vasylkiv District, UK 08631 Kiev Region, Ukraine
³Estonian University of Life Sciences, Kreutzwaldi 56, EE51014 Tartu, Estonia
⁴Tavria State Agrotechnological University of Ukraine, Khmelnytskoho pr. 18, Melitopol, UK 72312 Zaporozhye region, Ukraine
*Correspondence: jyri.olt@emu.ee

Abstract:

 Currently, throughout the world quite extensive use is made of combined tractor-implement units, which are capable of performing several process operations in the same pass. At the same time, the state-of-the-art ploughing and general-purpose tractors that can carry as front- so rear-mounted implements and accordingly feature both the front and rear PTOs, also able to travel efficiently as forward so in reverse gear, are most suited for the performance of such operations. Authors developed and successfully tested a combined tractor-implement unit on the basis of a wheeled ploughing and general-purpose tractor, which can in one pass efficiently chop the after harvesting crop residues with a front-mounted rotary chopper and simultaneously perform tillage with a rear-mounted plough. The aim of this study is the elaboration of the theoretical basis for the process of vertical oscillation of the combined ploughing and chopping tractor-implement unit and the validation of its dynamic stability in the longitudinal and vertical plane. The research has been performed with the use of the methods of designing the analytical mathematical models of functioning of agricultural machines and machine assembly units based on the theory of tractor, the vibration theory, the theory of automatic control and dynamic stability and the methods of computer programme construction and PC-assisted numerical computation. The dynamics of the said unit have been studied basing on the analysis of the amplitude frequency characteristics of the unit as a dynamic system responding to external perturbations appearing in the form of soil surface irregularities. Following the results of the undertaken analytical study, first the equivalent schematic model of the discussed combined tractor-implement unit in the longitudinal and vertical plane was developed, the unit’s characteristic points were defined, the linear and angular displacements specified and acting forces applied. Each pneumatic-tyre wheel of the unit represented by its elastically damping model had point contacts with the soil surface irregularities defined by the respective elevations. Using the original dynamic equations in the form of the Lagrange equations of the second kind, first we defined the generalised coordinates and the formulae for the kinetic and potential energy, dissipation functions and generalised forces, then, after performing the necessary transformations, we set up the system of four differential equations, which described the motion of the dynamic system under consideration. Further, we applied the Laplace transformations to the obtained differential equation system, which provided for obtaining the system of equations in the operator form and preparing them for the representation suitable for PC-assisted numerical calculations with the use of the developed computer programme. In accordance with the numerical computation results, graphs were plotted for the amplitude and phase frequency response characteristics of the tractor’s vertical oscillations at different stiffness coefficients of its steering wheels, the amplitude frequency response characteristics of the chopper’s oscillations depending on its mass and its support wheel tyres’ stiffness coefficient as well as the characteristics of the plough’s oscillations at different stiffness coefficients of its pneumatic-tyre ground support wheel.

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