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Auxiliary drives of modernized trolley-buses
Houšť, Pavel ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
The works describes the possibility of an upgrade by replacing the auxiliary trolley drives for DC motors asynchronous motors. It follows the historical development of the drives from the beginning to the present. It describes the advantages and disadvantages. Finaly the practical use of new ancillary drives for trolley.
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Design of single-cylinder diesel engine
Němec, Jan ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
This thesis deals with the construction of the whole combustion engine, the crankshaft design, the piston and the piston rod. It also outlines the central lubrication, the cooling, the injection pump, the movable pump and the gear pump as well as fuel filtering, injection, engine timimg, etc. The four-cycle engine has four working cycles. During the first cycle the "clean" air is drawn and the piston moves from the bottom centre to the top centre and it comes to compression in the cylinder thanks to the adjusting of the advance and the fuel is injected into the cylinder. As the piston moves rapidly to the top centre, the pressure and the temperature increase so much that the fuel ignites. The pressure is about 26 atm (2.634Mpa) and the temperature is about 600°C. The fuel burns ideally in spherical wave fronts. The fuel is injected under high pressure as aerosol generates. As the fuel expands, the volume increases and the piston moves to the bottom centre. And it is its only working cycle.The piston moves from the bottom centre to the top centre and the exhaust valve opens through which the hot gases of combustion leave - and everything repeats. The design of the particular components is shown in the animations. Modelling and simulations were produced using CAD system. Everything is supported with calculations.
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Powertrains of BMW cars
Guláš, Tomáš ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
Bachelor's thesis deals with the powertrains of the Munich carmaker BMW. It evaluates their historical development, focuses on the interesting innovative solutions in this domain, describes the current status and the success of BMW in the world market, points to a wide perspective and vision for the future car.
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Chassis of racing motorcycles
Kudr, Jan ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
Those theses describe complex of motorbike chassis and components from racing sector. Here is explained geometry of motorbike chassis and impact to riding properties. Geometry of motorbike chassis and driving style are closely linked with adjusting of damping and springing. In the end, depending on chassis adjustment tires can show us how good or how bad is adjusted the chassis.
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Automobiles of the eighties and nineties
Holuša, David ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
This Bachelor Thesis describes events, which led to automotive industry development in eighties and nineties of the twentieth century, further it focuses on situation in industry on each continent and on the most influential car factories, briefly describes the biggest inventions of the time and their principles and function from the technological side of view and considers implementation in modern cars.
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Redesign of passenger car
Kacálek, Jaroslav ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
In the introduction of the work there are briefly depicted main information about a reconstructed car, reasons of purchase and reconstruction of this car. In the first chapter there are reasons for reconstruction related to the state of the car described in more detail. Next chapters describe particular procedures of the reconstruction. Last chapter describes the final touches. Reached results and the comparison with the starting state are evaluated in the end.
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Racing car chassis
Macháček, Tomáš ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
Cílem této bakalářské práce je analýza současných konceptů podvozků závodních okruhových aut. V první části práce je zpracován historický vývoj, charakteristika kol a pneumatik s reprezentací dobře známých produktů. V druhé části je popsán systém odpružení, pružné média a tlumící členy. Systémy odpružení je zde rozdělen na nezávisle a polozávislé zavěšení kol a odpružení pevných náprav. Následující oddíl této práce je zaměřený na standardní kontrolní systémy, jako jsou ABS, ESC a TSC. Závěr přináší rychlé shrnutí této problematiky.
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Unconventional Supercharging
Horák, Tomáš ; Píštěk, Václav (referee) ; Dundálek, Radim (advisor)
This Bachelor thesis summarizes the various unconventional ways of improving the performance of combustion engines. This thesis descripts historical, currently used and prototype metods used for this purpose, including the principle of their function. Great emphasis is placed mainly on forced induction engines, since this area is experiencing very rapid development.
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Piston group of in-line four-cylinder gasoline engine
Král, Stanislav ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of the thesis, it is strength control group of ordinary four-cylinder piston gasoline engine. In the first part of the specified thermodynamic, geometric and operational parameters of the motor piston group will calculate the thermodynamic cycle. Furthermore, we see the effects of force acting on the piston group in the most strained moments of the cycle. For the reconstructed load piston group perform voltage control in piston pin and strength control rods of the eye. In conclusion, we compare the calculated values of permissible stress values and find a design safety factor for the part.
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