Perspectives of Increasing the Machine-Tractor Unit Performance

Nadykto, Volodymyr; Kiurchev, Volodymyr; Ayubov, A.; Chorna, Tetiana; Кистечок, Александр Дмитриевич

doi:10.31388/2220-8674-2018-2-1

Cited by 4 publications

(6 citation statements)

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“…Taking into account the above, the working width of agricultural tools for such work is from 2.8 to 5.6 meters. [2].…”

Section: Problem Formulationmentioning

confidence: 99%

Study of the Kinematics of the Positioning Mechanisms of Wide-Grip Machine-Tractor Units

Sharhorodskiy,

Kondratuk

2023

Engineering, Energy, Transport Aic

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As stated in the humanitarian food program "Grain from Ukraine", launched by the President of Ukraine Volodymyr Zelenskyi: "The demand for agricultural products in the world is growing by 2-3% every year, and the shortage of grain on the markets of Africa and Asia may reach 10-15% already in 2024". Therefore, the issue of production of agricultural products is relevant today. As the analysis of the market of agricultural machinery shows, one of the directions of the development of the design of agricultural units is to increase the width of grip of tools for soil cultivation and plant care. The use of agricultural units with an increased working width has certain advantages: - reduction of the number of passes of equipment on the ground; - reduction of fuel consumption; - reducing the negative impact of the unit on soil density. Among the disadvantages of this type of aggregates should be attributed the increase in turning radii, as a result of the increase in width. It is possible to eliminate this shortcoming by quickly transferring the unit from the working position to the transport position and vice versa. To fulfill this task, a review of known designs of wide-grip aggregates was carried out. Known hydraulic drives for raising and lowering and folding and unfolding sections are considered. A kinematic diagram of the mechanism of rotation of the extreme section of the cultivator relative to the frame has been developed. Based on this calculation scheme, the reactions in the hinges were determined and the graphical dependencies of the mutual location of individual elements with respect to the angle of rotation φ were calculated. The existing hydraulic positioning mechanisms, which are equipped with chainless wide-grip machines and tools with articulated frames, do not provide the necessary maneuvering properties of MTA during their movement on the turning lane. Equipping hydroficated positioning mechanisms with follower stabilizing devices is a promising direction for improving hydraulic drives of machine-tractor units, which create prerequisites for reducing the turnaround time on the turning lane by selecting the parameters of the specified equipment. The most important factor affecting the stability of the positioning of the sections of wide-grip machine-tractor units is the variable load that occurs on the hydraulic cylinder rod at the moment of turning the sections around the horizontal hinges at an angle of more than 90⸰, which causes inconsistency in the flows of the working fluid entering and leaving the hydraulic cylinder , which leads to the interruption of the flow in the cavity of the hydraulic cylinder, which is connected to the injection hydraulic line.

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“…Taking into account the above, the working width of agricultural tools for such work is from 2.8 to 5.6 meters. [2].…”

Section: Problem Formulationmentioning

confidence: 99%

Study of the Kinematics of the Positioning Mechanisms of Wide-Grip Machine-Tractor Units

Sharhorodskiy,

Kondratuk

2023

Engineering, Energy, Transport Aic

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“…However, they do not consider the dynamics of harvesting machines. The study of the stability of a ploughing unit mounted frontally on an aggregating tractor is devoted to [12][13][14], the methodology for constructing graphical dependencies of oscillatory processes is given in [15][16][17], and the controllability of movement is reflected in [18]. The issues of changes in soil properties that affect the oscillations of harvesting machines are discussed in [19; 20].…”

Section: Budzanivskyimentioning

confidence: 99%

Mathematical modelling of oscillations of a machine for cutting tops of root crops

Budzanivskyi¹

2022

Tehnìka ta energetika

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High-quality cutting of root crop tops at the root ensures both a high yield and determines the condition of the root crops before they are extracted from the soil. Therefore, the search for conditions that will ensure this is an important and urgent problem for the production of these crops. The purpose of this research was to determine, through an analytical study, the optimal parameters of a new design of a machine for harvesting root crop tops, which is mounted in front of an aggregating tractor and performs oscillatory movements in the longitudinal-vertical plane. Methods related to the modelling of complex dynamic systems consisting of an aggregating tractor and a front-mounted machine, the development and solution of the final form of differential equations of oscillatory motion and computer modelling of the oscillatory process were used. According to the developed equivalent scheme, a new differential equation of angular vibrations of the machine was solved in the final form. In addition, numerical modelling was performed on a PC, which allowed constructing graphical dependencies of the machine’s turning angle φ at different speeds V of its forward movement and values of the c stiffness coefficient and μ damping coefficient of the pneumatic tyres of the copying wheels, and at different values of the unevenness of the soil surface and the main design parameters of the machine. It was established that with an increase V from 1.5 m·s-1 to 2.5 m·s-1, the amplitude of oscillations of the machine’s turning angle φ increased from 0.88° to 1.18°. However, at V 1.5 m·s-1, the duration of the transient process is 0.22 s, and at a speed of 2.5 m·s-1, this figure is already 0.14 s, i.e., a decrease of 36%. The positive amplitude of oscillations φ of the machine’s steering angle reaches 1.2°, and the negative amplitude does not exceed 0.3°, i.e., the oscillation range is insignificant. In the range of values considered V, preference should be assigned to its higher value. The structural and kinematic parameters of the system examined were determined using computer simulation. The presented method of mathematical modelling of the oscillatory process can be used in the research of any machines that are hitched in front of the aggregating tractors

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“…As the investigations show (including those carried out by us), raising the efficiency of the machine-and-tractor aggregate by increasing the engine power of the aggregating tractor is a more promising direction [2]. However, in this case, much depends on the requirements of the concept that the tractor of the wheeled modification is created.…”

Section: Introductionmentioning

confidence: 99%

“…However, in this case, the formation of the machine-and-tractor aggregates in which an increase in the engine power of an aggregating tractor without increasing its mass requires the solution of some of its specific issues, the main of which being the question associated with the fact that the more engine power is used, the more problematic its implementation through the tractive effort of the tractor. This is particularly pronounced when its energy saturation level exceeds 15 kW•t −1 [2].…”

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confidence: 99%

A Mathematical Model of Plane-Parallel Movement of the Tractor Aggregate Modular Type

et al. 2020

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The new machine-and-tractor aggregate of a modular type, developed by us, consisting of the power and the technological modules, can significantly increase the efficiency of using the tractor when it is aggregated with a five-body plough. The new design solution for connecting these modules in a horizontal plane through a damper, consisting of a hydraulic cylinder and a throttle, allows significant increasing of the movement stability of this aggregate in a transverse-horizontal plane. To test the efficient operation of the proposed design, as well as to determine the kinematic and design parameters that provide the required level of stable movement of this modular machine-and-tractor aggregate, we carried out theoretical and experimental field investigations. For this, a new mathematical model of plane-parallel movement of the machine-and-tractor aggregate of this type was built. It was found that a change in the operating speed of this aggregate during ploughing from 1.0 to 3.0 m∙s−1 does not lead to a deterioration in the stability of the movement of either the technological or, especially, the power modules. The delay in the reaction of the power module of the machine-and-tractor aggregate of the modular type is practically invariant with respect to the change in the mode of movement of this aggregate within the range 1–3 m∙s−1. It was also found that the values of the tire slip resistance coefficients of the wheels of the power module do not have a noticeable impact upon the development of fluctuations of the disturbing moment.

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Perspectives of Increasing the Machine-Tractor Unit Performance

Cited by 4 publications

References 0 publications

Study of the Kinematics of the Positioning Mechanisms of Wide-Grip Machine-Tractor Units

Study of the Kinematics of the Positioning Mechanisms of Wide-Grip Machine-Tractor Units

Mathematical modelling of oscillations of a machine for cutting tops of root crops

A Mathematical Model of Plane-Parallel Movement of the Tractor Aggregate Modular Type

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