|
| |
|
|
Web Application for Dietary Plan Creation
Matějíček, Vojtěch ; Zendulka, Jaroslav (referee) ; Bartík, Vladimír (advisor)
The aim of this bachelor's thesis was creation of a web application which generates daily menus based on measuring body losses. User creates records of his losses at regular intervals. Food in these menus correspond to food or dietary plan that user chooses from three implemented plans. Therefore, getting familiar with principles of creating web applications and studying theory of implemented dietary plans were both part of this thesis. Application provides opportunity to review recipes and creates shopping lists. Recipes, menus and shopping lists can be printed. User registers and logs in the application with his e-mail and password.
|
|
|
Cold weapons
Střechovský, Jan ; Němec, Karel (referee) ; Molliková, Eva (advisor)
The aim of this bachelor thesis is a summary of relevant information concerning cold arms. Concerning the amount of content of this topic, this thesis is focused on general knowledge regarding the types, usage and development of cold arms, with mentioning some interesting and less known facts. It also contains deeper analysis of some chosen cold arms or key parts in their manufacture process.
|
|
|
Material selection and heat treatment of blade knives
Mrňa, Tomáš ; Molliková, Eva (referee) ; Němec, Karel (advisor)
A good quality knife should have good cutting features and the edge should be resistant against blunting which can be achieved by using different materials. Steel is the most commonly used material for manufacturing of blades. There are 4 basic categories of steel used for blades manufacturing: unalloyed noble (class 12), low-alloyed (class 13-15), stainless (class 17) and special tool steel (class 19). The optimal combination of structure and features of the used material is achieved by tempering process. The goal of my work is to focus on the steel blade and to point out differences between materials used in mass production and steel used by cutlers. Including the possibility of using various unusual materials from already manufactured products. I am also trying to describe each kind of quenching and consequences of wrong processing.
|
|
|
The design of screw pump
Hyriak, Maroš ; Klas, Roman (referee) ; Haluza, Miloslav (advisor)
This thesis is concerned with the topic of Pumps with crew centrifugal impeller. Thanks to the benefits such as free passage and efficiency there are many practical applications of these products. Despite this fact there is only few manufacturers dealing with them what results in lack of research and available information in the area. In order to fill the gap, this thesis aims to propose hydraulic of screw centrifugal impeller to the specified parameters. The impeller with a single moving blade will be designed for pumping heavily polluted water and hardly pumpable liquids. Blade will be balanced together with the rotor, while the emphasis will be placed on the highest free passage of impeller. The theoretical part of the thesis summarizes literature on the subject, practical part deals with the calculations and adjustments pointing to a concrete proposal. Parameters of designed hydraulics were verified using stationary calculations using MRF model in FLUENT. As a results, two possible solutions are offered.
|
|
|
Aerodynamics of axial wind turbines
Dubnický, Ladislav ; Pospíšil, Jiří (referee) ; Škorpík, Jiří (advisor)
Nowadays, the climate change issue is becoming more and more actual in our society. Increase of the average temperature on Earth in a couple of degrees could have catastrophic consequences. One of the possible solutions seems to be renewable energy sources as photovoltaics, biomass of water and wind energy. This thesis deals with the aerodynamics problems of wind energy source. Wind turbines transform kinetic energy of wind to mechanical power. The efficiency is physically limited to 59,26 %, but in reality, it is getting around 45 %. This is caused by three biggest losses inducted in wind turbines as wake losses, losses due to finite number of blades and drag losses. Based on analytical relationships and including these three losses the aerodynamics blade design is conducted. Later, the numerical simulations show higher values of drag and lower values of lift force on airfoil compared to analytical calculation. In fact, percentage deviations are acceptable and to conclude, the numerical analysis was able to relatively accurately simulate force action of free stream velocity on the blade.
|
|
|
On the milling of turbine blades
Raška, Tomáš ; Polzer, Aleš (referee) ; Píška, Miroslav (advisor)
The aim of this work is an introduction to milling of turbine blades. It is focused on description of turbines, of materials use for their manufacturing, of milling, of CAD/CAM systems, methods used to generate trajectories on complex surfaces and presentation of principal issues encountered during milling of turbine blades.
|
|
|
Cutlery steels and their composition and properties
Lenghardová, Monika ; Kaňa, Václav (referee) ; Záděra, Antonín (advisor)
This paper is focused on the description of steels suitable for blades production in terms of their chemical composition, structure, properties and thermal processing. The practical part is focused on the assessment of particular selected tool steels manufactured by conventional procedures - AK5, N690 and RWL34 steel manufactured by powder metallurgy. There were carried out the two methods of thermal processing with all three selected steels and the subsequent assessment was performed on the basis of the results of mechanical properties testing - three-point bend and hardness according to Rockwell, including the metallographic assessment of material structure.
|
|
|
Shape optimization of new circumferential steam turbine blade attachment type
Mívalt, Tomáš ; Petruška, Jindřich (referee) ; Polzer, Stanislav (advisor)
This thesis describes selection and shows calibration of material model, capable of describing cyclic softening of material. Stress-strain FEM analysis of circumferential blade attachment for last section of rotor blades of steam turbine is performed, expected lifetime of existing attachment is evaluated. Multi-parameter optimization of new-shape attachment was done, resulting in dimensions for new-shape attachment with longer lifetime. Improvements in strain amount in comparison with existing attachment were evaluated and possible RPM increase of turbine with new attachment type was calculated.
|
|
|
Ventilation calculations in synchronous machine
Judas, Jan ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
The aim of the project was to get familiar with the environment of ANSYS CFX, create several models of fans and synchronous machine model in Autodesk inventor, create model of cooling medium flow through the machine with these fans and evaluation of results. Firstly the thesis describes the synchronous machine itself, losses of the machine, the flow of power of synchronous machine and methods of its cooling. Next the thesis describes each kind of heat transfer, laminar and turbulent flow. The thesis also refers of kind of the fans and the program used to calculate the flow Ansys CFX, including the method that Ansys used to calculate. The work describes the individual modification of fans and setting of calculation in ANSYS. Then displays the results of the analysis these fans for different numbers of fan blades and for modification of the fan. Then the thesis analyzes selected modifications due to changing speed. In the last chapter shows the analysis of flow in the machine with three different fans. In particular, there is shown the mass flow rate, pressure and its distribution on areas for evaluation.
|
guest ::
