Tractor Wheel Research Articles

Using the kinematic radius in the mechanics of elastic wheel rolling

As you know, in the mechanics of a wheel with an elastic tire, both dynamic (rd) and kinematic (rk) radius are widely used. At the same time, specialists in the theory of the motion of wheeled vehicles still do not have a clear understanding of the scope of their application. Keywords: elastic wheel, kinematic radius, circumferential force, dynamic radius, wheel traction force, instantaneous center of speeds, torque, solid, rolling resistance

Experimental Stand Movable Module for Determining the Traction-Linked Properties of Wheel Engines and the Results of Laboratory Researches for Determining the Traction Force of Two-Wheel Tractors

Introduction. Farmers make extensive use of two-wheel tractors equipped with traction and drive interchangeable units. Two-wheel tractors are required to move evenly with minimal slip of the drive wheels on the soil. The tractive force on the drive wheels of the tillage unit is the decisive power factor in this case. An objective traction force value can be measured only by carrying out experimental studies. Materials and Methods. To determine the traction force on the drive wheels of the twowheel tractor, the design of the experimental stand was proposed and substantiated (RF patent for useful model No. 188610 “Movable module of the test stand”), and a methodology for planning and conducting a multifactor experiment to determine the traction force was developed. Results. As a result of the laboratory tests the calculation dependencies of the tractive force on the drive wheels of the Neva MB23-MultiAGRO Pro two-wheel tractor were obtained. Soil conditions, design and technological parameters, operating modes of the two-wheel tractor, and rolling resistance forces were taken into account. Discussion and Conclusion. The use of the developed regression models of the traction force under the condition of ensuring uniform movement with the minimum permissible slipping of the driving wheels of the two-wheel tractor on the soil will allow obtaining the permissible values of the two-tractor motion speed and form the zones of its most effective functioning.

Increasing efficiency of operation of agricultural tractors with double tires

The article discusses the problem of reducing the effectiveness of agricultural processes and performance indicators of a wheeled tractor with dual tires, which arises as a result of differences in the static radii of the outer and inner wheels of the tractor. Experimental tests of a wheeled tractor on dual tires using a measuring system based on a free-programmed controller “PLK-150c” are considered. Based on the results of the graphical analysis, recommendations are given to improve the performance of the operation of a wheeled tractor.

MATHEMATICAL MODELING OF VERTICAL OSCILLATIONS OF A CUTTING MACHINE FRONTLY MOUNTED ON AN ARABLE-TILL TRACTOR

Experimental studies and production experience show that the most productive and high-quality collection of sugar beet haulms without soil impurities, is possible only when a continuous, carbonless cut of its main mass at the root is carried out. However, the use of haulm toppers with rotary haulm cutters, which are carried out without a guide cut, frontally mounted on energy resources, as well as a significant increase in the working speeds of harvesting, cause intense vibrations of these haulm toppers in the longitudinal-vertical plane, which not only reduces the quality of trimming the heads of root crops, but causes, in general, significant losses of tops. Therefore, there is a need for an analytical determination of the influence of the kinematic and design parameters of a topper, frontally mounted on a wheeled tractor, on the magnitude of the amplitude of oscillations in the longitudinal-vertical plane of its haulm topper. Taking this need into account, in this work we have constructed a computational mathematical model of the movement of a topper front-mounted on a wheeled tractor, based on the use of the original equation of dynamics in the form of Lagrange of the second kind. According to the developed equivalent circuit and the implementation of the necessary mathematical transformations, a nonlinear differential equation was obtained, which describes the oscillations of the rotary cutting device of the topper in the longitudinal-vertical plane when its pneumatic gauge wheels move over the unevenness of the soil surface. According to the compiled program and the numerical solution on the PC of the specified differential equation, rational constructive and kinematic parameters of the topper frontally mounted on the tractor have been determined which reduce the indicated oscillations. So, with the forward speed of movement of the topping unit equal to = 3,0 m∙ s–1, the vibration amplitude of the topper rotor decreases 1,2 ... 1,5 times in comparison with the height of the field surface irregularities, equal to = ± 0.04 m. With the vibration amplitude of the lower ends of the knives of the rotary cutting apparatus up to 4 cm, the loss of haulms does not increase significantly. However, with an increase in the amplitude of these fluctuations to 7 cm and more, the loss of tops increases significantly, the maximum values of which exceed 12%.

К вопросу определения буксования сельскохозяйственных тракторов

The well-known methods for determining the slipping of the propulsion devices of agricultural tractors are described. A regression analysis of the traction characteristics of a wheeled tractor is performed. The equivalence of the method for determining the current slippage through the actual tractor speed and engine crankshaft speed is assessed. A regression model is proposed to determine the amount of slippage based on the method of local polynomial regression (locally estimated scatterplot smoothing or LOESS)

Organic carbon dynamics in interrows of Vitis vinifera with different years of soil use and management

This study aimed to evaluate the effects of soil use and management on organic carbon stocks in the interrows of Vitis vinifera with different years of cultivation. A vineyard located in Rio Grande do Sul state, with 4, 9 and 16 years of management, was evaluated. Soil samples from different layers, 0.0-0.10, 0.10-0.20, 0.20-0.30, 0.30-0.40, 0.40-0.50 and 0.50-0.60 m, were collected on wheel tracks, between wheel tracks and under the planting rows. As a reference, samples were collected in native grassland of the region. Organic matter content, bulk density and soil porosity were evaluated. Carbon stock was determined according to the correction of the sampled thickness. The results were subjected to analysis of variance and means were compared by Tukey test at 0.05 probability level. Soil management caused alterations in its structure and organic matter content, observed mainly in the first 30 cm, regardless of the area studied. Highest values of bulk density were observed on the tractor wheel tracks, followed by under the planting row and between wheel tracks. Alteration in soil cover for vineyard planting led to a reduction in the carbon stock, compared to the native grassland. The area under management for 4 years showed higher carbon stocks between the wheel tracks, whereas the areas under 9 and 16 years of management showed highest values in the wheel tracks.

EXPERIMENTAL AND COMPUTATIONAL STUDY OF LIQUID OSCILLATION DAMPING IN A FREE SURFACE VESSEL

Studying the issues related to solving the problems of the movement of fluid in partially filled structures of various shapes has always been relevant.This is due, in particular, to the need to ensure the longitudinal and lateral stability of the movement of objects in which the liquid is transported. Contemporarymethods and research tools that allow describing the movement of liquid in a container are overly complex and require in-depth knowledgefrom a scientist. Therefore, development of a mathematical algorithm that would be simple and at the same time ensure sufficient accuracy in determiningthe oscillatory motion in a container is advisable. Each development of a new mathematical algorithm requires experimental research to verifyits adequacy. The purpose of this work is to confirm the feasibility of using the created mathematical apparatus for determining the main parameters offree vibrations depending on the level of liquid in a rectangular prismatic container. The experimental research methodology provides for checking theadequacy of the mathematical algorithms in determining the frequencies of free oscillations of liquid in a container by comparing the theoretical andexperimental values of the oscillation periods, as well as determining the damping decrement of oscillations for liquids of different viscosity. As a result,the adequacy of the formulas for determining the frequencies of free oscillations of liquid in a container is proved; the maximum error does notexceed 4.35%. The decrements of vibration damping are determined experimentally, as well as using theoretical models of the motion of viscous liquidin the so-called partial surface layers, for three liquids of different viscosity, namely, for water, for 20% sugar and water solution, and for vegetable oil.On the basis of experimental studies, the amplitudes and frequencies of forced vibrations of various types of liquids are determined by constructing anamplitude-frequency characteristic. It is shown by calculation how the damping decrement of the liquid affects the value of the horizontal displacementof the surface layer of the liquid in the tank during its transportation by a wheeled tractor.

Modular-Technological Scheme for Tractors of Traction Classes 1.4

The increase in power of modern energy-saturated wheel tractors does not allow us to realize all the power through traction, causing an increase in fuel consumption. Therefore, the search for ways to improve tractors of the new traction and energy concept is a vital task.To solve the problem of implementing the power reserve of energy-saturated tractors, a modular scheme for completing a machine-tractor unit (MTU) based on wheeled tractors of traction classes 1.4 was considered. To increase the technological universality of tractors of traction classes 1.4, a tractor configuration scheme with a technological module based on an easily connectable and detachable linkage design is considered. This allows us to aggregate the tractor both independently with any implement for tractors of classes 1.4 and with a process module with implements for tractors of classes 2-3.As a result of the studies, a modular layout scheme for the MTU based on a tractor of traction classes 1.4 in combination with a technological module was proposed. The technological module is a single-axle drive trolley-hitch made on the basis of an articulated steering frame equipped with drive wheels. MTU formed after a modular scheme based on a wheeled tractor allows us to use the coupling weight of not only the tractor, but also the technological module with an agricultural implement mounted on it. The weight of the technological module is selected in such a way as to ensure the transition of the tractor to the adjacent traction class according to the type applicable in our country.Based on the undertaken studies, a reduction in losses to overcome resistance and slipping of propulsors, an increase in the MTU productivity and a more complete use of the tractor engine power were obtained.

Elements of the mathematical support for the design of an autonomous tractor

The article discusses the issue of substantiating the requirements for the location of passive benchmarks as part of a local complex of precision farming in its minimum configuration. As such, we consider a mobile chassis (for example, a wheeled agricultural tractor) equipped with an autonomous control system and a set of two or three passive benchmarks. References are given to works that reveal the technologies that are in demand in the design of the chassis of such a tractor and a description of the test equipment used in the design and debugging of units and assemblies of robotic machines. Within the framework of the concept under consideration, it is important that the complex combines the capabilities of autonomous, remote and manual control and is based on a mobile chassis that meets the necessary ergonomic requirements. The considered simplest system can be built into a structure that uses satellite positioning technologies and supports the principle of organizing multi-agent systems. The object of the research is a local complex of precision farming in the minimum composition: an autonomous agricultural tractor and a set of passive benchmarks. The purpose of the study is to determine the basic requirements for the selection of sites for the installation of passive benchmarks. The basic technology is the use of binary maps of permeability as a variant of the discrete working plan of an autonomous robotic complex. The technology for building maps of cross-country ability has been worked out when creating models of rovers and special vehicles. The paper illustrates the actual method of solving the problem in its mathematical interpretation, provides the main results and practical recommendations. It is shown that the proposed solutions can be extended to the areas of the forest engineering and logging industry, to the solution of logistic problems of the Far North, the territories of the Arctic and Antarctic.

Estimating the dynamics of a machine-tractor assembly considering the effect of the supporting surface profile

Results of theoretical studies of dynamics of the machine-tractor assembly taking into account the influence of a bearing surface profile were presented. It was established that in the course of operation, the machine-tractor assembly is exposed to a number of external factors leading to a change of vertical loads on the chassis and the engine. Mathematical models of dynamics of a tractor and a machine and a tractor unit consisting of a tractor of pivotally connected arrangement and a trailed sower were constructed. Such models make it possible to study dynamics and oscillatory processes of multi-element units. A mathematical model of tractor wheel dynamics was formed. Speeds and angles of orientation of elements of the machine-tractor assembly in space were determined. Influence of profile of the bearing surface on the unit elements when moving in the field prepared for sowing and the field after plowing was calculated. Theoretical studies of the influence of the bearing surface profile on dynamics of the machine-tractor assembly were performed on the example of KhTZ-242K tractor and Vega-8 Profi sower (Ukraine). When moving, the sower frame has a smaller amplitude of vibration accelerations than that of the tractor. Accordingly, the tractor has higher oscillation energy because it rests on the ground through its wheels having appropriate stiffness. The sower moves with its working bodies immersed into the soil which leads to a decrease in the amplitude of oscillations. The highest energy of amplitude of oscillation accelerations of the sower frame in the vertical direction was observed at frequencies of 15.9; 23.44; 35.3 and 42.87 Hz. It was found that the increase in working speeds of agricultural units leads to the fact that oscillations of all components reach significant values. This entails an increase in dynamic loads on soil and, as a consequence, its compaction

Determining the theoretical trajectory of the centre of tractor’s mass when turning in a combined way

One of the ways to increase the stability of movement and improve the manoeuvrability and controllability of a wheeled universal row-crop tractor in curvilinear motion is the choice of a rational turning method. To solve the tasks, the authors proposed a combined method of turning the tractor, which consists in crabbing in the entry into the rotation, after which the rear wheels automatically return to the neutral position and then the direction of movement in the established rotation and exit from the rotation uses front steering wheels. The article developed a methodology for determining the theoretical trajectory of the centre of mass of a wheeled tractor with a combined method of rotation for the three distinct sections of the movement included in it. Based on the conditions of smoothness and continuity, we glued together three characteristic sections of the curvilinear trajectory of the centre of mass and obtained a continuous non-linear piecewise smooth function of the investigated combined rotation method. It is possible to apply the research results for theoretical calculations of the parameters for the curvilinear motion of tractors, as well as other wheeled vehicles, that allows choosing rational laws to change the speed and control modes of turning the wheels, to identify the patterns of change for ensuring the necessary stability, manoeuvrability and controllability and confirming effectiveness in comparison with known and previously investigated laws.

Modeling of peat tractor semi-trailer motion

Wheeled tractor vehicles are used to transport peat from open cast mines to storage stockpiles or processing facilities. This paper analyzes dynamic stability and control of an articulate vehicle. A mathematical model of linear dynamics is demonstrated for deformed supporting base and a two-tier transport unit consisting of an AWD tractor and a two-axle trailer. The functions obtained from analysis of maneuverability of the transport unit may be used in studies of operational and technical properties of the vehicles as calculation formulas to determine the trajectories of its components when transporting peat materials in peat mines. This analytic approach provided understanding of the propulsion system of the tractor vehicle and grounds for subsequent computer modeling of the process.

Experimental Investigation of Traction Power Transfer Indices of Farm-Tractors for Efficient Energy Utilization in Soil Tillage and Cultivation Operations

Farm tractors in cultivation consume a big amount of fossil fuels and emit greenhouse gases to the atmosphere. Improving traction performance and power transfer indices of wheeled tractors and field terrain soil with higher traction (pull ability) at optimal travel reduction (TR) can optimize energy utilization. This study compares the traction performance, fuel consumption, and field productivity, of a farm tractor equipped with a new drive wheel “rigid lugged wheel (RLW)” and conventional tire wheel (CTW) in field tillage operations. Tractor with RLW resulted 24.6 kN drawbar pull and 6.6 km.h−1 travel speed at 80% tractive efficiency and 15.6% TR. While with CTW, the drawbar pull and the travel speed were 23.2 kN and 6.0 km h−1 respectively at 68% tractive efficiency and 36.3% TR. The RLW resulted in improved traction performance with similar equipment weight. Tractor with RLW also resulted 220.5% lower TR, 14.8% higher field productivity, and 15.4% lower fuel consumption. RLW can control equipment weight and field traffic intensity with the improved traction performance of wheeled tractors and will make the field operations more energy-efficient and economical. For enhanced field drivability of RLW, further work is required to test for diverse field conditions and differently sized tractors.

Stabilnost smera kretanja poljoprivrednog traktora

The discrepancy between the plow width and the tractor width leads to the asymmetry of plowing units. The geometry of the plowshare surface of the moldboard plow contributes to the generation of lateral forces on the working tool. All this leads to the imbalance of the tool and the deviation of the tractor from straight-line movement during plowing. To maintain straight-line movement, the driver has to adjust the machine every 5-10 meters, which is highly tiresome. To study the causes of lateral slips of the plowing unit, we constructed a mathematical model, which consists of the equations of controlled movement and equations of the tractor's uncontrolled shear under the action of external forces from the plow. The description of the force interaction of the drive with the ground is based on the mathematical theory of friction, taking into account anisotropy and elastic properties in contact. Based on the passive shear model, we constructed a hodograph diagram of the maximum tractor shear force from the side of the working tool. We found that the shear force reaches its maximum friction value only in the case of a translational shear, when its line of action passes through the tractor's center of gravity. In all other cases, the shift (slip) of the tractor is caused by a lower force. We formulated the features and assumptions of the model as applied to caterpillar and wheeled tractors. As a result, we found that, regardless of the direction of the lateral displacement of the plow's traction resistance, the tractor is slipped towards the plowed field. The result of the numerical experiment showed that the main reason for the slip of the wheeled plowing unit is the difference in soils along the sides of the tractor but not the deviation of the plow traction resistance.

ПРИМЕНЕНИЕ МИКРОЭЛЕМЕНТОВ ПРИ ВЫРАЩИВАНИИ КАРТОФЕЛЯ -ПРЕДПОСЫЛКИ ИСПОЛЬЗОВАНИЯ ДРОНОВ

The use of trace elements in the form of a chelated fertilizer can increase the yield and shelf life of potato tubers. When processing plantings with a tractor unit after closing the tops, severe damage to the plants by the tractor wheels is likely to be caused. In this case, it is advisable to use drones. The aim of the study was to make a comparative assessment of the eff ect of innovative preparations: sulfur-containing and containing trace elements in chelated form: Fe, Zn, Mn, Cu, Mo, Co, B, and the Aquarin-12 preparation on the yield and shelf life parameters of potato tubers of the Udacha and Kolobok varieties, as well as to perform preliminary calculations of the spray (capture) width when spraying potato plantings with a drone. The studies were conducted in 2018-2019 on sod-podzolic sandy loam soil. The experiment was carried out according to the requirements of the fi eld experiment and potato research methodology. The experiment was laid out according to the scheme, by the method of systematic placement of plots in four-fold repetition with a planting density of 44.4 thousand bushes/ha and the inter-row width of 75 cm. The use of the tested preparations allowed increasing the yield by 3.4…8.7 t/ha (12…37%) and reducing the total storage losses by 1.6…2.3%, especially in a good weather year. According to the calculations performed, it turned out that at the height of the drone fl ight of 9 m, the value of the spraying width or the sprayer’s operating width was 10.4 m. When conducting fi eld tests on potato plantings in a fi eld of 120x20 meters with a plant height of up to 1.0 m, the drone performed that task in 15 minutes (including refueling). A signifi cant increase in yield and a reduction in total losses during storage confi rm the feasibility of using preparations with trace elements in a chelated form when growing potatoes.

Results of experimental studies of an agricultural tractor with an elastic-damping mechanism in a power train

Improving the operational efficiency of agricultural tractors is one of the main factors that helps to increase productivity while significantly reducing energy costs. The developments that are associated with improving the design of power transmissions for wheeled agricultural tractors are very important, because its indispensable condition is to increase labor productivity in agricultural production. Achievement of the required characteristics of agricultural tractors is determined by the properties of the power train and the interaction of associated systems. One of the main qualities of a power train should be the ability to absorb torsional vibrations and damp the load.
 The article presents studies of the constructive improvement of the power transmission of an agricultural tractor by installing a developed elastic-damping mechanism using the example of a tractor of a small traction class. Considering the relevance of the topic, the article solved the problem of determining the influence of the elastic-damping mechanism installed in the power transmission of the tractor on its operation with the cultivator.
 The paper analyzed the cross-correlation function and the mutual spectral density of two processes: the angular speed of rotation of the crankshaft of the engine and the angular speed of rotation of the drive wheel, which showed a change in the speed of propagation of passing frequencies of load oscillations along the shafting and displacement of the frequency of disturbing influences.

ПРОБЛЕМИ, НАПРЯМКИ ТА ПЕРСПЕКТИВИ СТВОРЕННЯ І МОДЕРНІЗАЦІЇ ЗЕМЛЕРИЙНИХ МАШИН БЕЗПЕРЕРВНОЇ ДІЇ СПЕЦІАЛЬНОГО ПРИЗНАЧЕННЯ

The article addresses directions and horizons in the creation of highly efficient specialized continuously operating earthmoving machines and provided a technical proposal for the multipurpose earthmoving machine. Study subject: continuously operating earthmoving machines. Objective: To create a power-efficient special-purpose earthmoving machine. Study method: experimental. Existing dimension-types of trenching excavators allow digging lengthy excavations of the assigned profile with minor deviations from their nominal width and depth. Creating of excavations of different profiles is being achieved via machine re-equipment with different implements. A sustainable solution is to create multipurpose earthmoving machines that are capable to perform lengthy excavations of various widths and depths with the same implement and without constructional alterations. There are known machine designs for trenching on the basis of a wheeled tractor with a mounted chain-bucket implement that is able to perform the lateral oscillatory displacements in relation to the vertical axis on the hull back of the tractor. Alteration of the implements oscilative motion amplitude allows to excavate the tranches of differnt width. This is the essence of the multipurpose earthmoving machine. The existing kinematics chain sections of the implement in relation to the tractore can't ensure the consistency of the machine load due to inconsistency of the borings along the width of excavation. This leads to significant pulsation of the load on the implement, loss of the longitudinal stability and, in the end, reduces the potential productivity of the machine by half. We have performed a set of studies in creating of the multipurpose earthmoving machines (MEM). As the experimental study objects we've used physical models of the MEM implements and full-size prototypes of the machines. Results of the study experimentally confirm the possibility to create a highly productive MEM with rotary implement, which efficiently performs trenches as well as wide construction pits in the mode of reciprocating approach of the rotary implement to excavation by means of equalization and minimization of power load parameters values. KEYWORDS: EARTHMOVING MACHINE, ENERGY INTENSITY, KINEMATICS, PRODUCTIVITY, SOIL

Evaluation of trailer attached-two wheel tractor (Pat- pat) accident - related pediatric injuries in Turkeys western black sea region

Traumatic injuries related to agricultural production can lead to serious illness, disability, and even death. Pediatric injuries due to trailer attached-two wheel tractor (Pat-pat) accidents occupy a scarce place in the literature. To contribute to the literature, we aimed to evaluate the demographic characteristics and analysis of pediatric injuries due to a Pat-pat accident admitted to our emergency department in the last decade. The study data were obtained by retrospectively examining patients younger than 18 years of age admitted to the Emergency Medicine Clinic between 01/01/2010 and 31/12/2019 with injuries due to Pat-pat accident. Demographic characteristics, injury sites, injury types, hospitalization status, length of hospital stay, injury severity score (ISS), and mortality status were recorded. Due to the Pat-pat accident, 32 children applied to the hospital. The male/Female ratio was 25/7. The median age of pediatric patients ranging from 9 to 18 years was 17 years. When evaluated according to the injury areas, extremity injuries were the most common. Admissions were most frequently in the summer season (n=21, 65.6%) and in July (n=13, 40.6%). These cases were admitted mostly on Tuesday (n=8, 25.0%) and between 16:00 and 23:59 (n=22, 68.8%). According to the ISS, 20 of the patients had a mild injury (ISS≤3), 3 had a moderate injury (4≤ ISS ≤8), and 9 had a severe injury (ISS≥9). To prevent accidents, the public should be made aware of this issue, and the authorities should be more careful in making the necessary administrative decisions and in implementation. For young agricultural workers, it should be an obligation to ensure proper education and job security. Pat-pat, which is not well known but often used in rural agricultural areas of the Western Black Sea region, can have dangerous consequences for children. Children should be kept away from such unsafe vehicles.

Modeling the effect of wheeled tractors and skidded timber bunches on forest soil compaction

An increasing demand for forest products incites a large number of log transportation operations, which may lead to negative consequences for the soil and the ecosystem as a whole. This paper is focused on establishing a mathematical model to estimate the soil deformation and compaction processes under tires of wheeled forest machines and individual components of the skidding system such as forwarder, limbs, butts, and tops of tree-lengths in high latitudes, permafrost soil and forests. The method applied is based on simulating the impact processes of elastic tires and the skidding system on the soil through a mathematical device for the measurement of the compaction parameters for different types of soil and the size of the shelterbelt. The effectiveness of the proposed models was evaluated according to experimental results. The influence of the rheological (elastic, viscous, and plastic) properties of soil were studied. The elasticity of tires and the running speed of forest machines can help to control the performance of forest machines. This can be done by reducing the pressure exerted on the soil and increasing the number of skidder passes 1.5-2-fold. Comparative analysis showed that the calculated data differ from the experimental ones by no more than 10%. The obtained results and the developed model will allow for a qualitative and quantitative assessment of technological impact on the soil during the projecting maps for logging operations.

МОДЕЛИРОВАНИЕ ПАРАМЕТРОВ ТРАКТОРА И СОСТАВА ПОЧВООБРАБАТЫВАЮЩЕГО АГРЕГАТА С УЧЕТОМ ВЛИЯНИЯ ПРИРОДНО-ПРОИЗВОДСТВЕННЫХ ФАКТОРОВ

The research goal was to substantiate the model and the algorithm of forming the parameters of a wheeled trac-tor and the configurationof a tillage unit taking into account the natural and production conditions. To evaluate the in-fluence of natural and production conditions on the param-eters of the tractor and the unit configuration, three groups of factors were considered: the class of run length which determined the optimal value of the net productivity of the unit at a particular operation withminimal operating costs; characteristics of the draught resistance of the working machine which formed the optimal speed mode of unit op-eration; the indices of the drawbar pull and coupling prop-erties of the tractor which determined the conditions for effective functioning in the working mode. We substantiat-ed a computational model representing the response of a multidimensional dynamic system to external disturbances, setting and controlling actions which performed the trans-formation according to the input-output type. The interrela-tion of the input actions of different groups and the output parameters of the system were determined using the rea-sonable indices and optimization criteria. The adaptation to operating tillage technologies is determined by the nominal values of the working speed set according to the criterion of minimum energy consumption per unit of net productivity taking into account the restrictions on the drawbar pull and coupling properties of the tractor ensuring operation in the zone of maximum pulling efficiency. The adapters to the production conditions are specific ones referred to the unit of net productivity at nominal speed, the working width of the unit, the operating weight and the required power of the tractor. The product of specific indices by the optimum for a given run length and type of operation, the value of net productivity determines the parameters of the tractor and the unit configuration taking into account the influence of natural and production factors. The algorithm for optimizing parameters was developed; four rational standard sizes of wheeled tractors with an operating power of 135 to 310 kW with adjustable weight and unit configuration for technical support of tillage technologies in the main natural and cli-matic zones of operation were substantiated with an adap-tation coefficient of 0.978-0.987.