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Increasing the efficiency of the diesel engine emission system
Stráník, Daniel ; Fridrichová, Kateřina (referee) ; Böhm, Michael (advisor)
This thesis addresses the issue of emission from heavy-duty vehicles with diesel engine. Perfect combustion in the engine is unattainable, leading to the inevitable production of pollutants during diesel combustion that must be effectively eliminated. Emission systems are used to reduce pollutants present in exhaust gases. As emission limits continue to decrease, and with the impending introduction of the new Euro VII emission standard, it is still important to reduce emission from internal combustion engines. This is particularly significant as electric and other alternative drives are not yet sufficiently developed for heavy-duty vehicles. This thesis proposes a strategy for achieving the greater reduction of pollutants and the desired increase in the efficiency of the entire emission system. For this purpose, a numerical model was created using GT-Suite software, and simulations were conducted to replicate the WHSC and WLTC class 1 driving cycles for the simulation of steady and transient states. The emissions resulting from the modified emission system were compared with those from the default system. The conclusion of the thesis is a brief description and evaluation of the results, accompanied by an outline of potential future procedures.
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Analysis of an asynchronous machine with electronically switchable pole count.
Němec, Josef ; Cipín, Radoslav (referee) ; Bárta, Jan (advisor)
This Masters thesis deals with pole-changing machines. Advantages and possible design of these machines was presented in the first chapter. The use of pole-changing machines in electric traction was discussed in the second chapter, together with the possibility of fluent pole change. The last chapter deals with construction of these machines and their inventors. In the fourth chapter an equivalent circuit model of the machine was presented and later used to calculate basic machine parameters for the use in finite element method. In the fifth chapter a machine with toroidal winding was designed, which allows various coil connections and thus it allows the winding to have different pole and phase count. Several possible connections and combinations of phase and pole numbers were presented and exemined with the help of finite element method. Based on this analysis, an asynchronous motor with distributed winding was designed in the last chapter and its ability to increase efficiency at higher speeds by changing the number of poles was verified.
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Efficiency increasing of bearing rings machining
Pekař, Pavel ; Chladil, Josef (referee) ; Sedlák, Josef (advisor)
The master's thesis deals with the efficiency of turning in machining of forgings of bearing rings made of 100Cr6 steel. The first part is focused on the problem from the theoretical point of view. Next, an analysis of the existing production process was carried out and an inovation that will lead to its efficiency was proposed. Part of the work is to carry out tool durability tests under different cutting conditions and to compare them with the current state of production from a technical and economical point of view.
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Design and Implementation of New Process for Call Center for Concrete Organization
Kyselová, Petra ; Střížová, Vlasta (advisor) ; Říhová, Zora (referee)
This paper deals with the definition of Corporate Communication and the specifics of telephonic communication with the customer, and further definition of the Process and Process Management focused on process analysis ,which is part of the practical part. Extensive section is devoted to practical study. The benefit of this paper is a comprehensive view at the business model of BEZREKLAMKY s.r.o. The paper deals with analyzing the present state of business model, under which are determined possibilities to increase the efficiency of the process. The last part is devoted to assess the advisability of establishing cooperation at a distance by phone. This process is designed with all the formalities so that it can be directly imlplemented into the current model.
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