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High Pressure Injection Systems
Břoušek, Roman ; Otipka, Václav (referee) ; Dundálek, Radim (advisor)
This thesis is based on high pressure injection system mostly for commercial vehicles. The aim is to describe direct injection systems on specific drive units with methods of reducing emissions and their common issues. Gradually, the parts of injection system are described including their function. By comparing direct injection systems of gasoline and diesel similarities can be notice by aspect of their function. Finally is good to mention onset of electrification and thus develepment of injection systems, which are retreat by combination of financial and technological aspects.
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Design of a movable lift for passenger cars
Češpiva, Zdeněk ; Láštic, Daniel (referee) ; Otipka, Václav (advisor)
This bachelor thesis deals with the design of a movable lift for passenger cars. Now we have a great deal of lifts for cars, so the research part focused on their basic division. The main parts of the work include the design of a movable lift, which is then subjected to strength calculations. After these calculations, it can be stated that the designed lift is suitable in terms of safety. The outputs of this work include drawing documentation of the assembly and selected components of the lift.
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Noise in the interior of vehicles and methods of reducing it
Patočka, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor thesis focuses on the issues of noise in the interior of vehicles and the methods of subsequent decrease of such noise. Moreover, the thesis shortly describes the most notable sources of noise involved in the overall acoustic within the automobile. The undertaken analysis illustrates that the main source of noise in older vehicles is the combustion engine, an exhaust and intake system, and a gearbox tool. Conversely in modern vehicles, as a result of the unceasing progress of alternative drives, the most notable noise in modern vehicles is the aerodynamic noise and the noise forming out of the contact between tires and roadway. The research showcases that the elimination of these sources is aimed at the use of isolation and absorption structures, as well as the technologically advanced methods such as the ANC method. In relation to the increasing pressure on emission-free traffic, often resulting in insufficient vehicle soundproofing, the thesis summarises the findings concerning the issues of additional vehicle soundproofing.
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Design of a planetary gearbox of an RC model produced by the 3D printing
Rada, Jan ; Rekem, Jakub (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis deals with the design of a planetary gearbox produced by 3D printing. The first part is focused on research in the field of current technologies and 3D printing materials. The production process for FDM technology and the theory of planetary gears are described here. The second part is focused on the design of the gearbox to meet the input parameters so it could be produced by 3D printing. The design process from the calculation through modelling to the actual printing of the gearbox is described here.
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Design of a mattrack unit of an RC model produced by the 3D printing
Mašek, Dominik ; Rekem, Jakub (referee) ; Otipka, Václav (advisor)
The focus of this bachelor thesis is 3D print and design of mattrack unit for the RC off-road car. In the first part there are description of 3D print technologies, materials for 3D print and evaluation which of this method is suitable for hobby printers. The second part is focused on technical solution and the design of mattrack unit, most of unit parts are made by 3D print. First step was choosing of type of construction which should be inspiration for this mattrack unit. It was necessary to choose suitable tolerance of holes and pins to get required deposition of printed parts. There was problem with an unstrung belt when bodies of guiding wheels rotated. This problem was solved by the mechanical limitation of rotate. The construction is described by the technical documentation which was created by the 3D model.
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Powertrain of a modern electric vehicles
Mraček, Pavel ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
The bachelor’s thesis deals with powertrains of modern electric vehicles. The opening part briefly mentions the important historical milestones of electric mobility. The main part of the thesis describes different concepts of powertrain layouts and analyses its main components. The described components are mainly electric motors, batteries, and transmissions. The whole thesis is concluded with comparison of mass–produced electric cars divided into two categories according to the price.
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Vehicles for driving schools
Rajnštajn, Jakub ; Rekem, Jakub (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is focused on a description of car adaptations made for driving school needs and the suggestion of another possible upgrades. In the first part, there is described the evolution of common automobiles, especially in spheres important for mentioned potential upgrades. That means the pedal system and active safety technologies above all. Then, there is made a summary of nowadays adaptations, which allow the instructor to control the vehicle during the driving lesson, especially the second pedal controls. Thereafter, there are suggestions of upgrades, which could come with increasing the safety level of the driving lessons. It means especially the possibility to release the brake force from the instructor’s seat, the evolution of additional function of infotainment system and the usage of assistance systems.
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Test Rig Design Proposal for the Experimental Validation of Transmission Parameters in Closed Loop Torque Condition
Otipka, Václav ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The thesis deals with the design of the experimental testing rig. Test rig is designed to measure NVH transmission parameters. First, basic knowledge of vibro-acoustic measurement is discussed. This is followed by an evaluation of the most commonly used power devices to derive real loads on measured gearboxes. In more detail, a back-to-back test rig is disassembled among other things. In the thesis are described two main components, which are composed of a connecting element and a test bench. Both components were optimized during the design due to their modal properties. Numerical modal analysis was performed in ANSYS Workbench software. The thesis also includes strength calculations performed using both numerical and analytical approaches. The indispensable result of the design work is the complete drawing documentation. Finally, measurements of vibrations and noise on the physically made connecting element assembly have been performed and subsequently evaluated.
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Vehicles with CNG drive units
Otipka, Václav ; Svída, David (referee) ; Píštěk, Václav (advisor)
The bachelor’s thesis is devoted to vehicles with CNG drive units. The introductory part focuses on the analysis of fuels that are used for propulsion of piston combustion engines. Not only the very expanded fuels but also unique fuels are analysed. The main part of the thesis describes the construction of mass-produced vehicles powered by natural gas. There are analysed the individual function elements of the vehicle which are different from common vehicles on conventional fuels. Part of the thesis is about CNG vehicle operation including ecological and safety impacts. The whole thesis concludes the current offer of cars on the domestic market.
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Powertrain of a modern hybrid vehicles
Novák, Štěpán ; Zajac, Roman (referee) ; Otipka, Václav (advisor)
This bachelor’s thesis is about the drivetrain in modern hybrid vehicles. It describes the function of a hybrid drivetrain and divides it according to structure, degree of hybridization and placement of the electric motor. It characterizes the design solution of the main components of a hybrid drivetrain. It focuses on the powertrain of selected hybrid vehicles and describes the emissions issue. The conclusion consists of evaluation of the hybrid drivetrain and its vision for the future.
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