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"Start&Stop" system diesel engine implementation into passenger car
Fajkus, Martin ; Drápal, Lubomír (referee) ; Rasch, František (advisor)
This thesis treat of implementation „Start&Stop“ system off passenger car with diesel engine. Creates summary of adjustments and changes necessary to insertion system, further critize effect of system on ride vehicles, as on the part of komfort so and safety factor, the advantages and disavantages in urban and super urban cycle. This system has not always been ranked separately, will be there described superiors systems, on which is implemented.
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Analysis, design and optimization of automotive starter
Benetka, Martin ; Hýsek, Roman (referee) ; Hájek, Vítězslav (advisor)
This thesis aims at automotive starters, their construction, characteristics and problems with starting at low temperatures. There are kinds of starters, function principle, construction, advantages and disadvantages in the first part of thesis. Issues with combustion engine starting and basic technical requirements are also mentioned here; characteristics and importance of starters and combustion engines are also described. Last chapters of this part are dedicated to finite element method and its implication. There are analytical calculations of starter in the second part of thesis. Results are compared with experimental obtained (measured) values and results from RMxprt. Finite element method results are compared, too. Magnetic induction improvement in stator is also suggested.
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Ejection mechanism automotive starter pinion
Sláma, Miloslav ; Janda, Marcel (referee) ; Hájek, Vítězslav (advisor)
The thesis describes ways ejection pinions automotive starter and evaluation of the advantages and disadvantages of each solution. The first chapter deals with the principle of operation of DC motors and starters parameters. In the second part, the individual systems are theoretically discussed in terms of design and their advantages and disadvantages. The third part is focused on the most common system, which is analyzed in terms of mechanical and electrical reliability. The last point of the work is to design an experimental analysis Reach starter pinion.
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Automotive Electric Motors Innovation
Šimko, František ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
The purpose of this project is to explain the construction of motors in car technology. We can acquaint more with the construction of a DC electric motor. Then we will deal more with electric motor starters, an innovation of a DC electric motor or with its replacing for AC electric motor with other poles.
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"Start&Stop" system spark ignition engine, passanger car implementation
Kubiš, Milan ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
My bachelor work describes a system implementation Start&Stop and its usage in passenger cars with gas engine. The work details reasons for the usage of this system and technically describes the basic elements. It shows different constructions of the systems, their advantages and disadvantages, both from the point of the influence over the car movement and in terms of the motoring comfort and the safety of running, especially in the urban environment.
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Metabolic activity of mezophilic milk souring in production of cheeses with white fungus
Štěpničková, Jana ; Vítová, Eva (referee) ; Babák, Libor (advisor)
The thesis was processed in cooperation with Pribina s.r.o. The aim of the thesis was the monitoring of the starters of cheeses with the white fungus on the surface. The thesis was engaged in the monitoring process of a souring curve of used starters. This monitoring was based on temperature, titrating acidity and pH measured in the time interval. The souring curve was evaluated as the indirect measurement change of acidity of the starter in the time period. Further, the activity of detached starters was measured. The measurement was based on the change of pH measured in the time period. The influence of the culture medium was monitored by changes in behaviour of the bacterial cultures. The monitored starters were compounded of mezophilic and termophilic bacterial strains.
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Design and modernization of automotive starter
Bednář, Vojtěch ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The work deals with modernization of an automobile starter. In first and second part, we can find the analysis of types of starters according to construction and the analysis of gear of a starter. In third part, there is the analysis of electromagnetic layout of direct current motor with permanent magnets according to given parameters which is the gear of given starter.
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Výživa telat v období do odstavu
Sladký, David
Nowadays, the topic of calf nutrition in the weaning period is increasingly discussed. The theoretical part of the bachelor thesis describes the period of colostrum, milk and starter nutrition and weaning of calves. Furthermore, an overview of the feeds used in calves during the lactation period is presented, focusing on colostrum, milk replacers, starter feeds and drinking water. In the practical part, the results of a trial of feeding dairy compound feeds from two different producers are described. 20 calves were included in the trial and divided into two groups and after the lactation period, ten of them were fed with Multimilk Vital from VVS Verměřovice and the other group with Telfid Extra from FIDES AGRO, s. All calves were monitored for weight, health, consumption of starter mixture and gains were calculated and an economic evaluation of the cost of rearing calves was carried out. No statistically significant differences were found in live weight of calves, daily gains or consumption of starter mixture throughout the experiment. At one stage of rearing, a higher incidence of diarrhoea was found in calves fed Telfid Extra. Although the final evaluation of the increments showed almost identical results, after recalculation of the economic aspect, Telfid Extra with a cost of 47.57 CZK per kg of increment was more economical than the Multimilk Vital mixture, where the cost per kg of increment in the feed used was calculated at 58.02 CZK.
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Použití různých typů startérů ve výživě telat
Křivová, Štěpánka
The thesis objective was to compare the effect of different types of starters on starter intake, growth performance and fermentation in rumen of calves in the period of milk nutrition, and expenses on the starter. The experiment was carried out on Czech Fleckvieh calves (n = 28) housed in outdoor individual boxes and fed by colostrum (until the 5th day of life) or milk compound feed (since the 6th day of life) and starter. The calves were divided into four groups of seven animals each depending on the type of starter they were fed with (A: pelleted starter with oat grains; B: completely pelleted starter, C: textured starter, D: starter with chopped straw). The mean age of calves in each group was determined by their age in the beginning of the experiment and by sex. The experiment lasted in 52nd day of calves age. The mean intake of individual types of starters was relatively balanced thus the differences among groups were statistically insignificant as well as the average daily gain of calves in individual groups. There is substantial evidence that the expenses on consumed starter were the highest in case of the C group. The average rumen fluid pH of most of the calves was oscillating under 6 (with exception of calves in the C group in the first sampling and calves in the D group in the second sampling). In rumen fluid of most calves, quite high levels of propionic acid (over 30% with exception of calves from the D group) and low levels of acetic acid (under 56% with exception of the D group) were measured. Based on the end results of the rumen fluid examination, a disposition to development of subacute ruminal acidosis can be seen in case of calves from groups A, B and C. The pH levels and the levels of propionic acid and acetic acid in rumen fluid of the calves from the D group met the parameters of rumen fluid of healthy animals. Based on the results of the experiment it can be concluded that in terms of health, it is recommendable to opt for the starter with chopped straw, which is the most convenient for the development of rumen fermentation without risk of subacute ruminal acidosis.
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