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Model of bipedal walking robot
Čermák, Jan ; Maxa, Jiří (referee) ; Vyroubal, Petr (advisor)
The purpose of this thesis is produce a two-legged walking robot. This robot will be able to walking independently forward, without any assistance of human, after predefined trajectory. Whole thesis includes design of the robot construction, model the robot, following theory related to printing the robot on 3D printer and programming of robot walking.
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Laboratory simulator of radial journal bearing
Vincenc, Jan ; Čermák, Jan (referee) ; Šperka, Petr (advisor)
The master’s thesis deals with a design of a radial journal bearing simulator, which is ready to implement a transparent sapphire journal bearing to an optical observation of the oil film. The first part of this thesis contains a short review of a few currently used journal bearing test rigs. The next part of the work deals with a discussion of concept variants and a definition of important parameters. The last part contains a detailed description of the designed radial journal bearing simulator. Limitations of the designed simulator and recommendations for future improvements are also discussed. The result of the presented work is the designed journal bearing simulator which will allow observing of the oil film. The work also consists a complete design documentation.
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Mathematical models of military conflicts
Skopal, Martin ; Potůček, Radovan (referee) ; Čermák, Jan (advisor)
This thesis discusses the mathematical models used in the theory of warfare. The aim is to build and describe the Richardson model of conict and selected Lanchester models of combat. The models are subsequently analysed with a focus on stability. A part of the thesis is also formed by application of real data onto the models and by the subsequent evaluation of their results.
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Continuous and discrete models of population biology
Fedorková, Lucie ; Tomášek, Petr (referee) ; Čermák, Jan (advisor)
This thesis analyzes the continuous and discrete logistic model of a single-species population. For both of these models, there are discussed problems of equilibria, their stability and behaviour of the solutions for different initial conditions. In the case of the discrete model, the periodic behaviour of solutions is discussed in detail with respect to change of a parameter characterizing growth of the investigated population. The chaotic behaviour of solutions is mentioned as well. The graphic interpretations of each of the problems are performed using the software MATLAB. The calculations are checked via the software Maple.
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Analysis of the Rössler dynamical system
Nechutová, Vendula ; Nechvátal, Luděk (referee) ; Čermák, Jan (advisor)
In this bachelor thesis, there is analysed Rössler dynamical system, especially stability and type of its fixed points. Theoretical calculations are supported with visualizations illustrating notions of bifurcation and chaotic behaviour. In the last part, stabilization of chaotic Rössler dynamic system by delayed feedback control is discussed.
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Development of a testing system for evaluation of rolling bearings with variable lubrication parameters
Škoviera, Jozef ; Čermák, Jan (referee) ; Omasta, Milan (advisor)
The presented diploma thesis deals with the design of a test system for rolling bearings, which allows the change of the lubrication parameters (e.g. changing of the relubrica-tion interval). In the document, the reader first learns about the meaning of lubrication of rolling bearings, the possibilities of lubricant supply to the bearing (specifically for the supply of grease) and the possibilities of dosing control. Subsequently in the document is described the present state of experimental stations for testing rolling bearings, which is available at the Institute of Machine and Industrial Design. The end of the part about current state of knowledge is also mentioned the possibility of speeding up fatigue tests. In the next part, the author describes his own solution. The result is the design of an experimental station (for option to relubricate with grease), the creation of a lubrication control platform and the creation of a basic program. Part of the work is also verification experiments and drawing documentation.
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Lubricant film formation in compliant contact
Jaroš, Tomáš ; Čermák, Jan (referee) ; Nečas, David (advisor)
This diploma thesis deals with the study of film formation in compliant contact. Primary attention is dedicated to the influence of the entrainment speed and slide-to-roll ratio (SRR) on the central film thickness. Based on a research study of the available experimental methods, the fluorescence microscopy was used to achieve the aim of the work. Experiments were realized in ball-on-disk configuration. Firstly, a validation of the method was performed where the solid contact of the ceramic ball and the glass disk was analyzed. Since the measured values were in a good agreement with the theoretical prediction, a ball of NBR rubber material, which is commonly used for production of lip seals and o-rings, was subsequently used. The experimental measurements were performed under pure rolling and rolling/sliding conditions when the entrainment speeds varied in the range from 10 to 400 mm / s. A constant load of 0.2 N was applied. The measured data were then compared to the theoretical predictions for compliant contacts. The results showed that the thickness of the lubricating film gradually increases with increasing entrainment speed, which corresponds to theoretical assumption. Against expectations, evident influence of SRR on the film formation has been observed. In the last part of the thesis the measured data are confronted with previously published studies. Finally, some limitations of this study are discussed and recommendations for further improvement of the used experimental method are suggested.
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The relations between syntactic structure and functional sentence perspective as reflected in a parallel Early New and Modern English text: a study of developmental tendencies
Popelíková, Jiřina ; Dušková, Libuše (advisor) ; Čermák, Jan (referee)
The aim of this paper is to describe the different ways in which syntactic means may be employed to serve as indicators of information structure and to trace the historical development these means underwent from the Early Modern English period up to the present. The research is based on a comparative approach to textual analysis, using two different English translations of Boethius' The Consolation of Philosophy, one published in the early 17th century, the other near the end of the 20th . Both versions are analyzed in terms of the ways in which they express the same semantic content through different syntactic means, a special focus being placed on the sphere of individual clauses. Formal disparities between parallel syntactic units are investigated both from the grammatical and communicative perspective, mapping the effect of the differences in syntactic choices on the level of the functional sentence perspective. The study thus attempts to identify the extent to which the standardization of syntactic structures may be viewed as having exercised an influence over the communicative aspects of the language in the period between the grammatical systematization of the 16th and 17th centuries and the Present-day English standards.
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Word-Formation Processes in Contemporary English Slang
Libertin, Daniel ; Klégr, Aleš (advisor) ; Čermák, Jan (referee)
The presented study focuses on the processes involved in the formation of words in contemporary English slang. The aim of the study is to determine which patterns of word building are the most frequent, also compared to the general word stock of contemporary English, based on the analysis of a representative sample of contemporary slang expressions. In addition, the study attempts to determine if there are any phenomena that have been given little or no attention so far. The study consists of two parts. The theoretical part describes the phenomena that are relevant to the scope of the research and the study in general. The first section of the theoretical part includes a description of slang, also pointing out the differences in the treatment of slang between the English-speaking and Czech linguistic tradition. The second section contains a description of the source of the data used in the research, namely, the open Internet repository of slang expressions Urban Dictionary, which is one of the most widely used slang dictionaries on the Internet. The third section provides an overview of word- formation processes that are productive in contemporary English and relevant to the source material of slang lexemes. They include affixation, compounding, conversion, shortening, semantic change, borrowing or...
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