Drawbar Pull and Its Effect on the Weight Distribution of a Tractor

This article aims to experimentally determine how the tractor's weight distribution changes during loading by drawbar pull, and how the tractor's weight affects its drawbar pull properties. Drive wheel ballasting has a significant effect on the drawbar pull and wheel slip of the tractor - travelling gear losses. To achieve these objectives, we conducted experimental measurements on the tractor Case IH Magnum 370 CVX. The results show that higher drawbar pull is achieved in tractors with a higher weight. The measured increase of drawbar pull was 15,8 kN between maximal and minimal weight (Δ 2320 kg). All variants show an equal percentage increase in the weight on the rear axle of the tractor (+ 6 %). Increasing the tractor's weight affected the drawbar pull as well as the wheel slip. As the tractor's weight increases, there is a smaller increase in wheel slip as the drawbar pull increases. The results confirmed that tractor ballasting is important in order to achieve optimum drawbar pull properties, but it is necessary to keep in mind that the higher the weight of the machine or equipment, the larger the effect on the soil.O

The impact of upper link length on the output parameters of a tractor set

The aim of the article is to find out the impact of the increase in the force in the upper link of a three-point hitch on the performance parameters of the tractor set Claas Arion and the carried plough Pöttinger equipped with a traction roller and the cultivator Väderstad. During aggregation of the tractor with the plough with an average increase in the force in the upper link of a three-point hitch by 25 kN, a decrease of slippage in average by 8.25 %, a decrease in fuel consumption by 1.875 ml / m3 and an increase in effective performance by 0,225 m3 / s were achieved. During aggregation of the same tractor with the carried cultivator with an increase in the force by 40 kN, an average decrease in slippage by 2.64 %, a decrease in effective fuel consumption by 2 l / ha and an increase in effective performance by 0.6 ha / h were achieved. The changes in the observed parameters were demonstrably influenced by the change in the force in the upper link, which was more significantly shown during the aggregation of the tractor with the plough equipped with a traction booster.O

The Effect of the Tractor Tires Load on the Ground Loading Pressure

The contribution, based on the experimental measurement, analyses the issue of a specific pad loading pressure in relation to radial wheel load and tire inflation. Tile inflation in terms of allowed radial load, which we wish to be high as far as possible in terms of the power transmission from the wheels to the ground is important for the field tensile works, on the other hand, the pressure in the tire is closely related to the contact area and ground loading pressure. The obtained results show the following: Michelin Multibib 650/65 R38 tire, inflated to a pressure of 80 kPa has a sufficient reserve in radial load. As the measurement results show, ground loading pressure at the highest load of 36.55 kN, which was used during the measurement, is under the value of 100 kPa, which would mean on loamy soil at a humidity of 17 % that the limit of the ground pressure on the ground has not been exceeded.O

Posouzení kvality lisovaní u sběracích lisů

Diploma thesis is focused on a roller and prismatic bales, their the most important functional units and description this units followed by practical measurement selected parameters. First part contains a distribution presses on a round baller and square baller and their inclusion into agricultural machinery lines. The following describes the most important functional units of both types. Second part contains field-laboratory measurement, there are evaluated weight package parameters depending on its compression. Furthemore, performance is evaluated based on different parameters

A. C. Clarke's Space Odyssey and Newton's law of gravity

summary:In his famous tetralogy, Space Odyssey, A. C. Clarke called the calculation of a motion of a mass point in the gravitational field of the massive cuboid a classical problem of gravitational mechanics. This article presents a proposal for a solution to this problem in terms of Newton's theory of gravity. First we discuss and generalize Newton's law of gravitation. We then compare the gravitational field created by the cuboid -- monolith, with the gravitational field of the homogeneous sphere. This is followed by the calculation of the shape of free fall trajectories and the solving of Newton's equations of motion, defining the motion of the mass point in the monolith's gravitational field for general initial conditions. The final section describes the procedures for calculating the shape of the monolith's equipotential surfaces. Due to the complexity of the problems, all calculations are performed in the Maple program. The results of the calculations are illustrated using both 2D and 3D graphs