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Stanovení polohy těžiště zemědělského stroje
Židek, Martin
This bachelor's thesis solve the issue of center of gravity of agricultural machinery, specifically agricultural tractor. The purpose of thesis is: describe methods of research center of gravity, design new method and describe the reasons why is important to know the position of the center of gravity. In the experimental part, I measured the tractor model and then by using calculations I found the center of gravity. During the measurement of the center of gravity, I followed the Articles of Association resulting from the CSN 30 0415. All the calculations was interleaved by the method of least squares. I analyzed the results of the measurements at the end of this thesis.
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Analýza silových účinků pluhů na výstupní parametry orebních souprav
Slimařík, Dušan
The aim of this thesis is force effect analysis of ploughing rigs. MSC Adams software was used for mathematical-physical model drafting and subsequent evaluation of measured data from tensometrical load sensing. Designed model was utilized for force reactions calculations under the driving wheels of a tractor using analysis of spatial system of forces of tractors three point hitch. Field measurement data and data from MSC Adams software were tabular and graphically processed. Dependencies between plough and tractor connection setting and output performance of ploughing rigs were clarified. Results from experimental measurement with fully-mounted plough point out on the utilization of longitudinal and lateral position of ploughs CG for reducing of difference in load between furrow and land wheel with properly adjusted connection between plough and tractor. A result from experimental measurement with semi-mounted plough confirms the fact of significant difference in vertical load between rear axle wheels. This negative phenomenon could be eliminated with usage of traction cylinder localized in construction of semi-mounted ploughs over the horizontal joint. Correct adjustment of tractors three point hitch in case of fully-mounted ploughs and utilization of traction cylinder in case of semi-mounted ploughs have got positive influence on fuel consumption and field performance of ploughing rigs.
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Sledování závad na STK traktorů vybrané výkonnostní skupiny
HOFMAN, Marek
This bachelor's thesis is focused on monitoring defects in tractors that were brought to the technical inspection station for regular technical inspection. The introductory part of this work describes the most important laws, regulations and decrees that regulate the implementation of regular technical inspections of the monitored type of vehicles. In the practical part, the most common faults in the selected performance group of tractors are evaluated. Finally, the differences in the detection of defects in tractors compared to trucks are described.
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Technicko ekonomické hodnocení traktorových souprav na zpracování půdy
Staněk, Jindřich
The diploma thesis Technical-economic evaluation of the tractor set is focused on the construction of tractors and machines for tillage used in agriculture. The first part presents the current state of construction of tractors and machines used in agriculture for tillage, which are supplemented by pictorial illustration. The second part of the thesis is focused on the methodology of field measurement by the tractor set New Holland T7.315 HD AutoCommand and chisel cultivator Maschio Gaspardo Artiglio S 300/7. For the tractor set, the output values were monitored at different parameter settings.
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Vliv huštění pneumatik na výstupní parametry traktorové soupravy
Dvořáček, Vojtěch
The thesis dealswith tractortires. It shows the different types of tires used in agricultural machinery. This work also includes field laboratory measurements. Theme asurement examines the dependence of the tire pressure on the output parameters of the tractor set. The examined output parameters were operational and efficient performance and operational and efficient fuel consumption. The controlled variable in the set was the tire pressure in the tractor. Values were recorded for the different tire pressure values. The measurement results are graphically represented and commented on.
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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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Analýza silových účinků pluhů na výstupní parametry orebních souprav
Slimařík, Dušan
The aim of this thesis is force effect analysis of ploughing rigs. MSC Adams software was used for mathematical-physical model drafting and subsequent evaluation of measured data from tensometrical load sensing. Designed model was utilized for force reactions calculations under the driving wheels of a tractor using analysis of spatial system of forces of tractors three point hitch. Field measurement data and data from MSC Adams software were tabular and graphically processed. Dependencies between plough and tractor connection setting and output performance of ploughing rigs were clarified. Results from experimental measurement with fully-mounted plough point out on the utilization of longitudinal and lateral position of ploughs CG for reducing of difference in load between furrow and land wheel with properly adjusted connection between plough and tractor. A result from experimental measurement with semi-mounted plough confirms the fact of significant difference in vertical load between rear axle wheels. This negative phenomenon could be eliminated with usage of traction cylinder localized in construction of semi-mounted ploughs over the horizontal joint. Correct adjustment of tractors three point hitch in case of fully-mounted ploughs and utilization of traction cylinder in case of semi-mounted ploughs have got positive influence on fuel consumption and field performance of ploughing rigs.
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Faktory ovlivňující ekonomiku traktorových souprav
Katrenčík, Jakub
Farm tractors are used in various works that is the reason why manufacturers equip the tractors with engines with outputs from 30 to 450 kW, mechanical or hydro mechanical gearboxes and tires with various acceptable inflation pressures and dimensions. Many types of tires which are available for agricultural tractors, places higher requests on the knowledge of the transfer of power from the tires on a surface. What is the impact of different design of tires transmission on output power or fuel consumption can be determined, for example, make a field measurements. Results of field measurement shows that tire inflation and type of tires has significant effect on pull performance slip and fuel consumption.
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Analysis of the Selected Firm
Krejčík, Václav ; Veselý, Petr (referee) ; Hanušová, Helena (advisor)
This diploma thesis is concerned with a comprehensive analysis of ZETOR TRACTORS a.s. company. The main goal and mission of the analysis is to depict an actual stage of the company by some procedures and methods from the financial statements and the strategy and financial analysis, and on the basis of these analysises suggest some solutions and recommendations, which could be the subject matter towards improvement of the current situation in the future.
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