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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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Animation of the behavior of flexible power transmission elements
Dolíhal, František ; Franke, Jakub (referee) ; Hartl, Martin (advisor)
This bachelor thesis is dedicated to the creation of animations that are focused on belt transmissions and chain transmission. The content of the work is the selection of the displayed principles, the collection of corresponding theoretical equations, the transfer of these equations into the system of animation and the final demonstration of selected phenomena with help of output in form of educational animations. This thesis deals with the topics of kinematic and dynamic parameters of the transmission with slip and without slip, the course of forces along the neutral fiber of the flat or V-belt and the effect of polygon causing uneven speed of the chain transmission.
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Vliv huštění pneumatik na spotřebu paliva a výkonnost traktorové soupravy
Čuba, Norbert
The bachelor thesis deals with the influence of tractor tyre inflation on fuel consumption, slip and tractor performance in off-road conditions. It focuses on machine output parameters such as tire slip and hourly fuel consumption. The actual measurement of these parameters was carried out at three different tire pressures and keeping the tillage depth constant. The result of the field measurements is a confirmation of the fact that lower tyre pressures result in lower wheel slip and, at the same time, lower machine fuel consumption. These results are tabulated and graphically presented.
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Analýza výstupních parametrů traktorové soupravy na zpracování půdy v podmínkách soukromé farmy
Kokeš, Matěj
The thesis describes the current state in the design of soil processing machines and evaluates the influence of the three-point hitch settings of the tractor and the working tool on the output parameters of the sets. As part of the work, experimental measurements were carried out on two sets with a trailed cultivator and a trailed plow. The first set examined the effect of the load on the front axle and engine speed on tractor performance, while the second set examined the effect of the force in the upper hitch, loading of the driving axles, and engine speed on the output parameters of the tractor. The results of both measurements showed that with the correct tractor settings, slippage and fuel consumption decrease, leading to increased performance and work efficiency.
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Analysis of dynamic strength of friction knots used in military climbing
Telvák, Radek ; Michalička, Vladimír (advisor) ; Braum, Zdeněk (referee)
Title: Analysis of dynamic strength of friction knots used in military climbing Objectives: The aim of this work is to determine the resulting impact force generated by selected friction systems at different values of the fall factor. To calculate what maximum values of auxiliary Reep cord length and maximum load weight can be achieved without system failure. Determine the correlation between the magnitude of the impact force and the slip length. Methods: This thesis describes an experiment in which the resulting impact force acting on a friction system at different drop factors was determined. A 6mm Reep cord and an 11mm rope and friction knots used in military climbing techniques were selected for analysis. Testing was carried out in a polygon on a drop tower. Each of the friction knots was subjected to 5 tests at the same fall factor. The individual knots were statistically compared with each other in terms of impact force and slip. Using direct proportionality, the maximum possible values of the auxiliary Reep cord length and the weight of the load were determined. A correlation analysis was used to establish a correlation between impact force and slip. Results: It was found that at all measured values of the fall factor, the Twist prusik achieved the lowest values of the resulting impact force...
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Animation of the behavior of flexible power transmission elements
Dolíhal, František ; Franke, Jakub (referee) ; Hartl, Martin (advisor)
This bachelor thesis is dedicated to the creation of animations that are focused on belt transmissions and chain transmission. The content of the work is the selection of the displayed principles, the collection of corresponding theoretical equations, the transfer of these equations into the system of animation and the final demonstration of selected phenomena with help of output in form of educational animations. This thesis deals with the topics of kinematic and dynamic parameters of the transmission with slip and without slip, the course of forces along the neutral fiber of the flat or V-belt and the effect of polygon causing uneven speed of the chain transmission.
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Static strength analysis of friction knots used in military climbing
Telvák, Radek ; Michalička, Vladimír (advisor) ; Baláš, Jiří (referee)
Title: Analysis of static strength of friction knots used in military climbing. Objectives: Strength determination of selected knots on static ropes under static load. Methods: This bachelor thesis shows a laboratory experiment, where the influence of friction knots on the strength of the Reep cord tied to a static rope under static load was determined. For the purposes, a 6mm Reep cord and 10.5mm rope and friction knots used in military climbing techniques were selected. The experiment was run on a vertical test rig. Each of the selected knots was tested 10 times. Every knot was compared among the others in the first slip, slip length, maximum strength, nominal strength drop and the point of failure. Results: The highest average values of the first slip and the maximum strength were achieved by the Twist prusik. The lowest value of the slip length was measured at the Blake friction knot. Compared to other of the selected knots, the lowest decrease in nominal strength by 14 % was found on the Blake knot, while the highest decrease in nominal strength is found in the Twist prusik. The Reep Cord failed in 81 % of all attempts. Keywords: military climbing, friction knot, knot strength, slip, point of failure, nominal strength
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Engagement Force Control of Multi-plate Clutches of Dual Clutch Gearbox
Horák, Josef ; Prokop, Aleš (referee) ; Novotný, Pavel (advisor)
The master’s thesis deals with ways of controlling starting clutches of cars, especially of DQ200 gearbox, which contains dry disc clutches. The introduction describes basic principles of torque transfer and amount of clutch force. Then the description of construction of starting clutches and ways of controlling clutch types mentioned beforehand is given. In the next part of the thesis, wide spectrum of control methods is measured, from which a certain part is selected. This is followed by driving tests and based on driving data, one method of the clutch control is chosen. Then those control methods from narrow selection are tested for acoustic impact in the cabin of the car. In the end the best way of clutch control is selected. The selection based on driving data and acoustic measurement.
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Control of ABS educational model
Kubisz, Jan ; Spáčil, Tomáš (referee) ; Sova, Václav (advisor)
This bachelor´s thesis deals with renewal of education model for ABS braking simulation, determination of parameters of this model and following aplication of those parameters for simulation model compilation. Second part is to create two types of regulation with known speed of roadway and with unknown speed of roadway. Created regulators are then tested on real system to verify their funcionality.
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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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