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Numerical simulation of gear mesh stiffness
Rackovský, Daniel Milan ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
The diploma thesis deals with the simulation of the spur gears mesh stiffness. The introductory part of the thesis presents a detailed review of the knowledge in the field of gear theory, gear error and also NVH of gears. The next part of the thesis describes the basic principles of the function of the parametric FEM model of gear mesh, which was developed for the purpose of this thesis. The last part of the thesis presents the results of FEM simulations in which the effect of manufacturing error of the gears on the STE waveform was investigated. The basis of the simplified production error model was the sine function. The effect of the number of periods of this function and the magnitude of the amplitude on the STE waveform was investigated. The effect of the magnitude of the load torque on the STE of the production-error gear was also verified. The magnitude of the amplitudes of the sine function was determined to match the allowable wheel shape tolerances according to ISO 1328-1. The problem was solved in Ansys Mechanical APDL using a parametric FEM model based on APDL language.
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Innovative Schools and Their Networks in Post-Socialist Context: The Case Study of Gymnázium Přírodní Škola
Pražák, Daniel ; Dvořák, Dominik (advisor) ; Pol, Milan (referee) ; Michek, Stanislav (referee)
In recent years, there has been a great expansion of school networking in foreign education systems, but this approach appears less often in the Czech environment. This dissertation presents a case study that analyses the interaction of schools cooperating with the Gymnasium Přírodní škola through the concept of networking. The main sources of data are interviews with actors, school documents and field notes of the researcher. The study describes the mutual influence and sharing of elements of the innovative model between the schools involved in this network. Special attention is paid to the factors that facilitate or hinder effective networking and innovation sharing, as well as the role of principals, teachers and student involvement as active agents of change. The work thus connects previous research knowledge with the unique Czech context, which enriches the professional literature on networking of educational institutions. The results offer insight into the dynamics and challenges associated with creating effective educational networks and bring support for innovation in education through networking. KEYWORDS school networking, innovative educational models, inter-organizational collaboration, inter- organizational learning, school leadership, secondary education, students as actors, case...
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Final machining technology of a special bearing ring using a grinder on the holes
Růžička, Daniel ; Kalivoda, Milan (referee) ; Chladil, Josef (advisor)
The main goal of this thesis is to compare 5 chosen grinding wheels, that vary by the material and structure. The testing is done in the company SLB, spol. s r.o., using a grinder on the holes BDU 80, which is set to 6 different settings of the grinding cycle, defined by the letters A´, A, B, C, D and E. These settings vary by the cutting conditions and enable to compare the tested grinding wheels by 8 measured parameters of the surface quality of the grinded bearing orbits of outer rings of the SLB 84-74 bearings, that are described by the drawing documentation.
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Measurement and analysis of the blood flow in peripheral vessels by ultrasound Doppler methods
Lepš, Milan ; Sedlář, Martin (referee) ; Vlk, Daniel (advisor)
Nowadays, the Doppler ultrasonography is an essential part in medicine. With it, we can observe acoustic showoff some tissue associated with Doppler measurement of blood flow parameters. It is still using Doppler devices with a continuous signal which are although structurally and technically simpler, but they are suitable for measuring the speed and volume of blood flow in peripheral blood vessels of the upper and lower limbs. There are calculated physiological parameters from the flow curves that are clinically used for assessing the state of blood supply to the body part. We can determine many values from the flow curves, like peripheral resistance, blood flow in systole and diastole, medium speed, etc. Study group of people are male and female students from 18 to 20 years. Doppler measurements have been performed before physical exercise and after physical exercise.
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Estimation of pitch period
Matuštík, Daniel ; Tučková, Jana (referee) ; Sigmund, Milan (advisor)
This diploma thesis with estimation of pitch period of the human voice. The paper listed some of the methods for Estimation of pitch period and method for preprocessing and final processing of the signal after application of functions to determine the frequency of the pitch period in graphical user interface.
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Driven chaotic oscillators
Pšeno, Daniel ; Guzan,, Milan (referee) ; Petržela, Jiří (advisor)
The theme of this masters thesis are driven chaotic oscillators. The aim of this project is show the various types of driven chaotic oscillator and propose mathematical model solutions using numerical methods. In the first part of this thesis are shown theory of chaos, history of chaos theory, chaotic systems and chaos quantifiers. Next is numerical analysis of differential equations second order by Runge-Kutta fourth order method. Next part contains circuit blocks and synthesis of oscillators. In next part are defined all types of oscillators. Parameters of analysis, equations, circuits and simulations are defined for each type of driven chaotic oscillators. In each subchapter is design electrical circuit. This circuit is simulated and some of them realized.
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Pigment
Roudnická, Michaela ; Pitín, Daniel (referee) ; Houser, Milan (advisor)
In my bachelor's thesis I want to explore the possibilities of a painting medium through figural themes of albinism. In a missing pigment I see some king of analogy to painting, which I tried to apply into the medium.
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