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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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Crane crab traverse mechanism load 25 t
Zicho, Jan ; Pokorný, Přemysl (referee) ; Škopán, Miroslav (advisor)
The bachelor's thesis deals with the construction concept of the crane crab travel mechanism for a bridge crane with a load capacity of 25 000 kg. The research section deals with construction solutions used on the travel mechanism of crane crab. The thesis contains a construction concept of individual components of the travel mechanism which include wheels, motor and transmission, brake, driveshafts, bearings, and frame. Subsequently, this thesis contains a calculation of these components and their check-up. The output of the thesis is a technical documentation containing the drawing of selected components and assembly drawing.
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Driveline Design and Testing Methods
Poláček, Jan ; Straka, Tomáš (referee) ; Fojtášek, Jan (advisor)
This bachelor’s thesis deals with the methods of designing and testing of vehicle drivetrains. The first part of the thesis describes and explains the individual drivetrain components and their possible arrangements. Then, the test methods used in the development of vehicle drivetrains, which are increasingly demanded in terms of their efficiency and reliability, are explained. Therefore, this thesis summarizes the sophisticated simulation tools used in the design and development of vehicle drivetrains. In conclusion of thesis the importance of simulation and testing of drivetrain is considered.
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Transmissions of Passenger Cars with Hybrid Drive
Vaňourek, Jakub ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This thesis deals with transmission systems of passenger cars with a hybrid drive. The main reason for choosing this topic was its topicality. With increasingly strict emission standards, hybrid cars are coming to the fore. The first part of the thesis deals with the division of hybrid drives into individual categories according to the selected criteria. An example of a specific solution is then given for the individual categories and its construction, functionality and its advantages and disadvantages compared to cars with an internal combustion engine are described. In the following chapters, more complex hybrid systems are described in more detail in connection with construction and functionality. The conclusion is dedicated to evaluating the mentioned hybrid systems and outlining their potential use in the future.
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Prevalence and risk factors of malaria among children under 5 years and the prevention and treatment regimens in the Kitase community of Ghana
Amponsah, Ebo Owusu
The purpose of this study was to investigate the incidence of malaria in children under the age of five living in the Kitase Community in Ghana, as well as possible causes, preventative measures, and therapeutic approaches. The principal goals of the research were accomplished through the use of a hospital-based cross-section design, which required the gathering of primary data from women living in the Kitase township, which is located within the Akuapim South Municipal Assembly in Ghana. For the analysis, we utilised version 16 of the STATA statistical software. The chi-squared test and logistic regression were performed to determine the relationship between malaria incidence and household and environmental characteristics. Findings showed that malaria prevalence among under 5 children was 19.62% with a total of 46.15% with at least occurrence of malaria illness in the past three months. Also, ownership of Long-Lasting Insecticidal Nets (LLINs) was 77.31%, and its use among 58.46% of mothers. However, Environmental characteristics such as bushes, waste dumpsites, stagnant water, and breeding areas around the house increase the odds of malaria infection by AOR of 1.885, 2.455, 2.197, and 2.060, respectively. Therefore, the study recommends that health authorities in the study area ensure the proper usage of LLINs (mosquito nets) through regular and effective education on preventive measures and ensure that good sanitation is observed in settlements.
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Innovation and modernization of Massey Ferguson - search
KOLIHA, Jan
This bachelor thesis deals with the detection of innovations and modernizations of Massey Ferguson tractors. The first section describes all the innovations and upgrades of Massey Ferguson tractors. The second part is a comparison with competing brands, namely Case IH and John Deere. The values being compared include the navigation system, the ISOBUS connection, the connection of the machine to the service, the equipment levels of the machine, the gearbox variants and the engine manufacturer.
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Diagnostika traktoru Case
DOLEŽAL, David
This bachelor thesis deals mainly with Case IH tractors (hereinafter Case). It focuses on the diagnostics of the CVX continuously variable transmission, both parallel and serial. The introductory part is aimed on the theory in the field of diagnostics and its importance. The following section addresses a specific issue with a focus on the CVX continuously variable transmission. The practical part of the work first describes the simple construction of the gearbox and then the individual measurements are performed and comparisons with the prescribed values by the manufacturer.
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Determination of tick-pathogen interactions during acquisition and transmission of Borrelia duttonii by Ornithodoros moubata
ĆETKOVIĆ, Ana
The goal of this thesis was to investigate the interaction between Borrelia duttonii, a causative agent of TBRF in Africa, and its tick vector Ornithodoros moubata in terms of acquisition and transmission dynamics. The infectivity of frozen sera and infected unfed O. moubata ticks was evaluated. The acquisition efficiency of B. duttonii 1120K3 and Ly isolates by O. moubata was determined and compared. The minimum acquisition time was established as well. Moreover, the sensitivity of Borrelia in the presence of different animal sera was analysed.
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Trypanosomes of green frogs (genus Pelophylax)
Poloprutská, Klára ; Votýpka, Jan (advisor) ; Modrý, David (referee)
Anuran trypanosomes are the first ever observed and described trypanosomes and Trypanosoma rotatorium from frogs of the genus Pelophylax is a type species of the genus Trypanosoma. Despite the early discovery, they are being neglected in terms of current descriptive studies when compared to other trypanosomes, although their diversity and prevalence in anurans are quite high. Anuran trypanosomes, which are significantly larger than their mammal relatives, display a high rate of polymorphism and pleiomorphism; however, without any explanations. Because of the amphibious nature of frogs, the vectors of anuran trypanosomes are both aquatic leeches and terrestrial bloodsucking insects. This thesis which aims at widening the scope of knowledge about this neglected group of trypanosomes focuses on trypanosomes from frogs of the genus Pelophylax found in Central Europe and the Balkan Peninsula. An overall prevalence of 71% was found in 981 individuals and a total of thirteen trypanosome species were detected, eight of which are new to science. Significantly higher diversity was found in frogs originating from the Balkan Peninsula; however, no host specificity of trypanosomes was detected. It was not possible to unambiguously prove the relationship between morphospecies and genospecies. On the contrary, I...
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Design of gearbox for wind power plant
Zavadil, Roman ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
The main goal of this diploma thesis is the design of a gearbox for a wind power plant. The introductory part contains a set of knowledge about wind turbine gearboxes and introduces the reader to the issue in terms of the distribution of gearboxes, gears used, recommended bearings and in terms of wind turbine generators. The design itself begins with determining the input parameters of the transmission based on a simplified aerodynamic model of the wind turbine rotor. Further, using these parameters, a device arrangement consisting of two planetary gears and one permanent gear. The entire transmission is examined in terms of kinematics, and in both planetary gears, the kinematic examination is performed using the Willis method. Then, the helical gearing is designed and its normal modulus, geometry, forces are calculated and lastly the strength calculation of the gearing is performed. Then the durability of the bearings is calculated based on a force analysis and the patented flexible pin construction is checked regarding its bending and deflection. The housing of the entire device is constructed regarding the smallest possible installation space in the control room. The final part of the work is devoted to the strength control of the bolts at the first ring gear using the finite element method and modal analysis of the entire gearbox also using the FEM.
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