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Stanovení poloměru otáčení u traktorů Zetor Forterra 140 HSX, Zetor Proxima 120 Power a Zetor 7745 Turbo pro potřeby počítačových modelů
ZLOCH, Jan
The main aim of this diploma thesis is to determine the radius of rotation of selected tractors (Zetor Forterra 140 HSX, Zetor Proxima 120 Power and Zetor 7745 Turbo) on three different types of surfaces using different speeds. The literary part deals briefly with the importance and historical development of tractors, the basic knowledge of traction theory, the problems of forces acting on the rolling wheel, and last but not least the construction of the tractor parts. The practical part is mainly focused on determining the radii of rotation of individual tractors on three specified types of surfaces using the three given speeds. The discussion is mainly focused on comparing the radii of rotation meeting ČSN 30 0552 with the radii given by the tractor manufacturer.
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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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Design of Experimental Stand for the Study of Railway Vehicles Sanding
Galas, Radovan ; Hruška, Marek (referee) ; Šperka, Petr (advisor)
Presented master’s thesis describes the design and the implementation of an experimental device used for the study of tribological aspects of wheel-rail contact. In this work, the reader will first learn the fundamentals such as adhesion, slip, traction curve, etc. Subsequently, the work is describing devices that are used for the study of wheel-rail contact around the world. This section is followed by the author proposed solution. The result is a twin disc device in the scale of 1:3. The device allows determining traction characteristics for different environmental conditions (presence of water, sand and oil in contact for different temperatures) and various operating parameters (contact pressure and speed). A part of this work are also the validation experiments and complete design documentation.
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Firmware for the Robotic Vehicle
Otava, Lukáš ; Sojka,, Michal (referee) ; Kučera, Pavel (advisor)
This thesis is focused on a firmware for robotic vehicle based on the ARM Cortex-M3 architecture that is running a real-time operating system (RTOS). Theoretical part describes available solutions of embedded RTOS and concrete HW implementation of the robotic vehicle. There is also comparison of the three selected RTOS with their measurements. Result of this thesis is base firmware compounded by a program modules that controls HW parts. There is also a sample PC and firmware application that extends base firmware. This sample application is able to communicate with robotic vehicle, control wheel motion and measure process data.
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Fluid couplings and torque convertors
Skokan, Jan ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This bachelor thesis is devoted to the issue of fluid couplings and torque convertorsand their combination with mechanical gears. The main section outlines development and design of fluid couplings and torque convertors.Resources to improve their performance are also mentioned. Furthermore, there are mentioned combinations of fluid and mechanical transmission.
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Fluid couplings and torque convertors
Pospíšil, Dan ; Žák, Radim (referee) ; Klas, Roman (advisor)
Bachelor thesis contains basic information about torque converters and fluid couplings. The main part deals with hydrodynamic couplings and modification in their design to improve attributes during operation. Also listed are the basic equations. Listed below are the possibilities of construction torque converters and their parallel connection with mechanical transmission. The final section is devoted to the hydrostatic piston clutch.
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Fluid couplings and torque convertors
Dančák, Zdeněk ; Sloupenský, Zdeněk (referee) ; Klas, Roman (advisor)
This work presents basic points and informations as to fluid couplings, torque convertors and the means of connection in hydromechanical transmissions. Work describes various structural design, it’s perfection, disavantages, and cooperation with engine. There are described the possible means of torque characteristics optimalization according to the needs of operation as well as the means to achieve better efficiency.
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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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