National Repository of Grey Literature 64 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Application of the multi-axis milling of a shaped part
Klíma, Jiří ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
This diploma thesis focuses on the design and production technology of making pattern and core box by milling. The theoretical part summarizes the issue of production models, CAD / CAM technology and milling technology. The practical part is elaborates engineering design of machined parts focused on the specific requirements for application in the foundry. For designing of milling technology was used CAM system. This milling technology was programmed and optimized. Parts are finally produced on 3-axis milling machine. In the end there is technical-economic evaluation of production and discussion of results.
Using of 3D printed patterns for mass production of castings on "green sand" moulding lines
Vašek, Vojtěch ; Lauermann, Jaroslav (referee) ; Horáček, Milan (advisor)
Shortening of the time required to make first product after demand is a crucial factor in every field of industry, not excluding the foundry. To lower this delay, there are rapid prototyping methods. The aim of this thesis is to execute an experiment and then evaluate possibilities of using patterns made by 3D FDM printer on an automatic molding line.
Sensor Security - Verification of Image Authenticity
Juráček, Ivo ; Španěl, Michal (referee) ; Zemčík, Pavel (advisor)
Diploma thesis is about image sensor security. Goal of the thesis was study data integrity gained from the image sensors. Proposed method is about source camera identification from noise characteristics in image sensors. Research was about influence of denoising algorithms applied to digital images, which was acquired from 15 different image sensors. Finally the statistical evaluation had been done from computed results.
Production System Simulation and Analysis
Hromková, Ivana ; Křivka, Zbyněk (referee) ; Zendulka, Jaroslav (advisor)
The work deals with creating of simulation model of production system (foundry) and its analyze. Simulation of production systems is discussed in the introduction as well as basic principles and processes during simulation model making. Next chapter describes problems arise when such type of systems are solved. Next issue about virtual fabric is discussed. Information regarding virtual fabric has been obtained from Siemens conference. Follows views of simulation tools specialized on manufacturing systems. In last one chapter is taking up of implementation of simulation system. The whole process of creating of simulation model which consists of making conceptual model, abstract model, description of model making, analysis outcomes and experimentation with simulation model.
Tester for chosen sub-standard of the IEEE 802.1Q
Avramović, Nikola ; Dvořák, Vojtěch (referee) ; Fujcik, Lukáš (advisor)
Tato práce se zabývá analyzováním IEEE 802.1Q standardu TSN skupiny a návrhem testovacího modulu. Testovací modul je napsán v jazyku VHDL a je možné jej implementovat do Intel Stratix® V GX FPGA (5SGXEA7N2F45C2) vývojové desky. Standard IEEE 802.1Q (TSN) definuje deterministickou komunikace přes Ethernet sít, v reálném čase, požíváním globálního času a správným rozvrhem vysíláním a příjmem zpráv. Hlavní funkce tohoto standardu jsou: časová synchronizace, plánování provozu a konfigurace sítě. Každá z těchto funkcí je definovaná pomocí více různých podskupin tohoto standardu. Podle definice IEEE 802.1Q standardu je možno tyto podskupiny vzájemně libovolně kombinovat. Některé podskupiny standardu nemohou fungovat nezávisle, musí využívat funkce jiných podskupin standardu. Realizace funkce podskupin standardu je možná softwarově, hardwarově, nebo jejich kombinací. Na základě výše uvedených fakt, implementace podskupin standardu, které jsou softwarově související, byly vyloučené. Taky byly vyloučené podskupiny standardů, které jsou závislé na jiných podskupinách. IEEE 802.1Qbu byl vybrán jako vhodná část pro realizaci hardwarového testu. Různé způsoby testování byly vysvětleny jako DFT, BIST, ATPG a další jiné techniky. Pro hardwarové testování byla vybrána „Protocol Aware (PA)“technika, protože tato technika zrychluje testování, dovoluje opakovanou použitelnost a taky zkracuje dobu uvedení na trh. Testovací modul se skládá ze dvou objektů (generátor a monitor), které mají implementovanou IEEE 802.1Qbu podskupinu standardu. Funkce generátoru je vygenerovat náhodné nebo nenáhodné impulzy a potom je poslat do testovaného zařízeni ve správném definovaném protokolu. Funkce monitoru je přijat ethernet rámce a ověřit jejich správnost. Objekty jsou navrhnuty stejným způsobem na „TOP“úrovni a skládají se ze čtyř modulů: Avalon MM rozhraní, dvou šablon a jednoho portu. Avalon MM rozhraní bylo vytvořeno pro komunikaci softwaru s hardwarem. Tento modul přijme pakety ze softwaru a potom je dekóduje podle definovaného protokolu a „pod-protokolu “. „Pod-protokol“se skládá z příkazu a hodnoty daného příkazu. Podle dekódovaného příkazu a hodnot daných příkazem je kontrolovaný celý objekt. Šablona se používá na generování nebo ověřování náhodných nebo nenáhodných dat. Dvě šablony byly implementovány pro expresní ověřování nebo preempční transakce, definované IEEE 802.1Qbu. Porty byly vytvořené pro komunikaci mezi testovaným zařízením a šablonou podle daného standardu. Port „generátor“má za úkol vybrat a vyslat rámce podle priority a času vysílaní. Port „monitor“přijme rámce do „content-addressable memory”, která ověřuje priority rámce a podle toho je posílá do správné šablony. Výsledky prokázaly, že tato testovací technika dosahuje vysoké rychlosti a rychlé implementace.
Making sand moulds and cores for casting
Katrňák, Jiří ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
Bachelor thesis describes various methods for the production of sand molds and cores in foundry and basic concepts associated with this issue. Due to the large number of production methods are described only basic and most widespread methods. The work includes the design and manufacture of cast-iron grate for the stove, made into a mixture of bentonite and self-hardening mixture AlpHasetTM.
Optimization of properties of 3D printed patterns for the technology of casting into ceramic shells
Štěpán, Radim ; Horáček, Milan (referee) ; Krutiš, Vladimír (advisor)
This thesis is focused on optimizing the 3D printed patterns used for investment casting into ceramic shells technology. The technology of hybrid investment casting and complete process of ceramic shells manufacturing is described in this thesis. During the burnout of the 3D printed pattern a problem with shell cracking arises. This problem was solved by optimizing the 3D printed pattern – the amount of pattern infill and venting the pattern cavity. The optimizations were successfully verified on the sword guard pattern.
Software for simulation of water treatment and water distribution processes
Pavliš, Jan ; Malaník,, Stanislav (referee) ; Kučera, Tomáš (advisor)
This document aims on presentation of software focused on mathematic modelling in water treatment and water distrinbution. It consists of a list and descriptions of a number of programs which use static or long-term analysis in examining hydraulics in water distribution systems and also examine water quality parameters. There are other programs also included in this thesis that solve different types of analysis or water engineering structures. Then we can find elaborate descriptions of programs ARTS and Epanet and example analysis of both too. ARTS simulated waterhammer process and Epanet analysed water age through the water distribution system of a small village. This thesis brings basic overview of available programs designated for engineers of water treatment and distribution systems and is also the first step for my future Master´s thesis in which I would like to deeply focus on one of the programs.
Possibilities of using modern methods in manufacturing of prototype castings
Vašek, Vojtěch ; Mikulka, Vít (referee) ; Horáček, Milan (advisor)
Rapid Prototyping technologies are an important part of the industry. They allow reducing the time between the demand and the crafted prototype component. The main aim of these theses is to create a literature survey, focused on the application of these technologies in the foundry industry in the production of prototype castings.
Sheet metal drawing and its verification by computer simulation
Něnička, Filip ; Kopřiva, Miloslav (referee) ; Štroner, Marek (advisor)
This thesis engages on the differences between the numerical simulations of sheet metal drawing process performed using AutoForm software from AutoForm Engineering, Swiss company and actual results measured using non-contact measurement system Argus from German GOM company. This work used DC06 material (whose mechanical properties were determined at Technical University of Liberec) for comparison. The calculated results of simulations were compared to measured results of actual plate thickness.

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