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Stanovení poloměru otáčení u traktorů Zetor 6911, Zetor 7745 a Zetor 7711 pro potřeby počítačových modelů
ŠŤASTNÝ, Filip
The subject of the bachelor's thesis is Determining the turning radius of selected agricultural machinery. It deals with the analysis of working machines, sorting the tractors out according to multiple aspects and factors that influence the operation of vehicles in the field, such as wheel slipping, rolling resistance , air resistance or strength of the underlying material. Practical part deals with evaluation of measured results of Zetor 6911, Zetor 7711 and Zetor 7745 wheeled tractors and determination of turning radius. Work reflects the actual turning radius of particular tractors and weather conditions during the data collection. For better clarity, the results are written in the tables.
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Stanovení poloměru otáčení u strojů JCB TCA - 74, JCB 444TCAE - 108 a Dieci Agri Plus 40,7 PS pro potřeby počítačových modelů
PRŮŠA, Jakub
Bachelor thesis is focused on determination of turning radius of chosen agricultural technology. The thesis deals with analysis of working machines and divides loaders into a lot of categories. There are described factors, which influence operation of machines in terrain, such as wheel slip, rolling resistance, aerodynamic resistance or hardness of underlying material. Second part of bachelor thesis deals with evaluation of results, which were measured with telescopic loaders JCB 541-70, JCB 535-95 AGRI and Dieci AGRI PLUS 40,7 PS. In this part of thesis there is also determination of turning radius described and both are tabulated for better clarity. Real turning radius and weather conditions which took place during measure are included in the thesis.
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Vliv zatížení hnacích kol traktorů na výstupní parametry orebních souprav
Výravský, Tomáš
The present master thesis deals with the topic of load applied to driving wheels of tractors and its impact on output parameters of tilling systems. Introduction describes the advantages and disadvantages of tillage. It briefly presents its history, evolution and possible improvements of its parameters by correct plough and three-point linkage system of tractor settings. The following part explains the impact of load distribution between tractor driving wheels on its thrust properties. Some possibilities of improving load distribution between driving wheels are also specified and described here. Special attention was dedicated to improvement of load distribution by transferring part of the plough weight to the tractor. The practical part of the thesis explored the impact of force in upper linkage of three-point linkage system of tractor on the force transfer and subsequently on the output parameters of tilling systems. Two measurements were processed in the present master thesis, one focusing on the total additional loading or tractor rear axle and one focused on balancing the load difference between the right-hand side and left-hand side wheel of rear axle. The measured values were processed in tabular form and further evaluated by regression analysis. Conclusion was formulated based on the identified results.
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Vliv podvozku na tahové vlastnosti traktorů
Vykydal, Petr
The aim of this PhD thesis was to analysis laboratory and field measurements tractors with different chassis designs. For the measurements were used John Deere tractors with name 8320R if a wheel and if 8320RT crawler tractor, possessing the same engine power. Before the field measurements were conducted laboratory tests of tractors, which resulted was the compilation of the full speed characteristics. The field measurements were focused on identifying characteristics of tensile test tractors. For wheeled tractor were also measured differences tensile characteristics when changing inflation pressure. Subsequent comprehensive part of a field measurement looked at the analysis of data obtained from measurements of performance and energy parameters of tractor kits depending on the operating mode of the engine. From the experimental measurements show that the tractor equipped with a belt chassis design has a higher tensile strength and also has a lower specific consumption and slippage than wheeled tractor. When comparing the measured data with different wheeled tractor tire inflation pressure, we find that reducing inflation pressure has a positive effect on the change of the tensile characteristics. In the practical part of the measurements we have identified that tracked tractor achieves higher performance and lower energy intensity than the wheeled tractor. It was also shown that by adjusting the engine speed into so called economic areas can improve performance while reducing fuel consumption tractor sets.
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The influence of the chassis on drawbar properties of tractors
Chmelař, Zdeněk ; Havlíček, Miroslav (referee) ; Bauer, František (advisor)
In this master thesis is analyzed the current situation in the construction chassis of tractors, in addition, a methodology for evaluating the impact of influences on drawbar properties of tractors. The main objective of this work was to analyze and conclude the measured drawbar properties of selected tractor same power and weight categories with different chassis designs. Measured and calculated values were tabular and graphically presented. When evaluating the drawbar properties were determined according tractive power and slip depending on the drawbar forces.
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The effect of tyres on the output parameters of tractors
Kopečný, Aleš ; Havlíček, Miroslav (referee) ; Bauer, František (advisor)
The thesis summarizes the results of the measurement of the output parameters of the tractor, on which were mounted three different types of tires. The measured parameters are the maximum pulling power, slippage, specific effective fuel consumption at the maximum pulling performance. The final measured and calculated results are presented in tables and graphs. The results of the measurements were processed by the use of regressive analysis.
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The influence of the chassis to the power and performance characteristics of tractors
Rašovská, Hana ; Slimařík, Dušan (referee) ; Bauer, František (advisor)
This master thesis deals with the influence of the type of tractor chassis on its utility properties. For the rating were used tractors John Deere 8 – series with wheel and track chassis, equipped with the same engine and gearbox, which were carried out for laboratory and field tests. The aim of laboratory tests was the exclusion of the difference in engine power of both tractors and the aim of field tests was to evaluate the drawbar properties of tractors with a different type of chassis. The reference parameter was especially drawbar pull, further drawbar power, slip and fuel consumption. Based on the tabular and graphical elaboration of the measured values were evaluated results.
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Effect of surface texturing on elastohydrodynamic films
Puchner, Jiří ; Dzimko, Marián (referee) ; Křupka, Ivan (advisor)
Diploma thesis describes analysis of influence of surface texturing on non-conformal rubbing surfaces. High speed camera was used to observe the effect of micro-dents of various depths on film thickness under pure rolling and rolling/sliding conditions. It can be concluded from the obtained results that micro-texture of suitable sizes can results in film thickness increase without lubrication film breakdown.
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Regulatory hydraulics of tractors and its practical use
DOLEŽAL, Jan
The work deals with the regulation hydraulics for tractors and its practical use. The theoretical part includes the construction of three-point hinges, variants of regulatory systems and the impact of regulatory systems on the use and transfer of power. The practical part deals with the use of hydraulic control in practical operation.
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