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Injection moulding technology of thermoplastics
Mikulík, David ; Přikryl, Radek (referee) ; Kučera, František (advisor)
The work deals with optimization of the technological mode of injection moulding of test specimens 1A of semicrystalline PP and amorphous PS. It also explores the influence of technological mode changes on the crystallinity of a semi-crystalline PP. Was set the reference technological mode for each of the polymers and subsequently changed the value of the injection temperature, mold temperature, the volume when you switch to holding pressure, injection and holding pressure. After relaxation of injection for time 24 h, and the mouldings and dogbones were weighed and thickness were measured at selected points. From the dogbones made of PP samples were taken for differential scanning calorimetry (DSC) and crystallinity was examined. From the observed weight and thickness of dogbones were determined optimal technological modes for semi-crystalline PP and amorphous PS. Examining the influence of technological change modes on the crystallinity showed no clear dependence. Furthermore, it was found that the processing of a semicrystalline PP injection moulding reduces the value of crystallinity of the polymer, compare to starting PP granulate.
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Drive Vertical Saddle of Machining Centre by Linear Motor
Zapletal, Radek ; Andrýsek, Radim (referee) ; Foller, Bronislav (advisor)
The diploma dissertation deals with the mechanism of vertical movement of a saddle of high-speed machining centre which is made by the Trimill company. The movement of vertical alloy saddle is solved by ball screw. The solution could be improved by replacing the ball screw by linear motor. This will dramatically improve the dynamics of the movement of the vertical saddle. In addition, if the weight is compensated by pneumatic relief and the construction is welded, the dynamics will further improve.
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Static analysis of sports hall
Jedlička, Michal ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
This Bachelor´s thesis is about the static analysis of sports hall in Libina. I have used a program RFEM for making the model. The model was elaborated according to the provided project documentation and valid regulations ČSN EN. The aim of this work is to analyze the real construction and to point out to the formation of possible problems.
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Tank Combustion Engines from History to Present
Arnošt, David ; Svída, David (referee) ; Dundálek, Radim (advisor)
This work shows summary of engines used in the best known tanks since the beginning of their producing until today. The first part deals with sorts of fuels which are used, theirs differences and specificts in comparison with current engine. After it, my work occupies by decription of development and producing of tank engines in single states. In the last part there is description of the tank T-72 which is in the equipment of AČR.
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Energy efficient wireless sensor platform for a snow load measurement
Bačinský, Martin ; Kouřil, Jiří (referee) ; Mráz, Ľubomír (advisor)
This bachelor thesis describes the problematics of snow load measuring. At first, sensors' principles of functionality for indirect measurements are mentioned. In the second part, the problematics of direct measurement with tensiometer takes place. The construction of wireless apparatus with the help of module ZigBit for the snow load measurement is the result of this work. Sensor board is designed in Eagle software, obeying standards for machine vacuum pickup and fabrication. The apparatus works in two modes. During indirect measuring, additional processing of data is necessary. In this mode, the sensor board has very low energy consuption and therefore long service life also after a battery connection. In the second mode, the apparatus is automatically sending data about actual snow load of particular roof. The whole machine communicates with the help of ZigBit module and ZigBee protocol IEEE 802.15.4. The communication distance between sensorial points is allowed up to 100m. At last but not at least, tensiometer UTILCELL M230 measurements are attached. In attachments, chemas and printed circuit boards are presented, too. Except documentation, the CD contains also libraries for components and details for DPS machine production in Eagle Software.
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Microbending fiber optic sensors
Švestka, Jiří ; Štohl, Radek (referee) ; Šedivá, Soňa (advisor)
This thesis deals with the influence microbending the transmitted signal at the bare optical fiber. Microbending influence on the transmitted signal is investigated in this work by changing the weight, power and water level in the tank by using this test fixture. The results of the experiments are proposed to enter the laboratory tasks to measure the impact microbending the transmitted signal in the subject line fiber-optic sensors (MOES).
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Triumph of Ugliness
Kolářová, Monika ; Zálešák, Jan (referee) ; Houser, Milan (advisor)
Bachelor theses is my engagement with phenomenon of body, focused on the theme of beauty and ugliness. Through the Dionysian body type I am trying to capture the weight of physical imperfections. In contrast with the delicacy and subtlety glaze paintings I am trying to achieve a balance between the representatives of the general phenomenon of beauty and ugliness.
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Risk Process Evaluation
Jakab, Robert ; Ráb, Jaroslav (referee) ; Marušinec, Jaromír (advisor)
The first part of my work is focused on technology of Oracle. Here are mentioned individual languages, which works with data and different data types. Here is made clear manner, how are data saved in the database. Next I described technology of Apollo, on which information system Apollo is build. Next part of my work is analyze, in which is described present state of evaluation risk process and requests, which are layed on this module. Following chapter is implementation. There are described both database schema and by detail parts of module in a form of strips. Here is at large interpreted the way how to value risk and risk process. This chapter contains print reports for this module as well. The next chapter is dedicated to how module was brought to functioning. Except making this module running in information system Apollo is here a chapter about education of employees. In the closure I present evaluation of reached results, show next development and present my own benefit.
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Model Ranges Analysis of Wheel Loaders
Durna, Pavel ; Pokorný, Jan (referee) ; Kašpárek, Jaroslav (advisor)
The bachelor thesis deals with the division and parameters of the wheel loaders. Nowadays, there is an important representation of the bigger or smaller producers of the wheel loaders at the market. According to the size, weight and machine performance of the machine (wheel loader) is there a group of compact wheel loader, which is excelent because of manipulation, and a group of heavy line wheel loaders, which are usually used in quarry etc..
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