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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
291

Tříosá pracovní jednotka / 3D machining module

Horák, Michal January 2019 (has links)
The thesis deals with choosing the appropriate conception for a 3D CNC machining module, design, and construction of the given machine. This work is laid out into several parts that deal with automated production assemblies, appropriate construction alternate design, design of the selected machining module, and FEM method.
292

Automatizace a optimalizace konstrukce a pracovního procesu horizontální štípačky na palivové dřevo / Automatization a optimalization of desing and proces of firewood horizontal log splitter

Čechman, Jan January 2019 (has links)
Diploma thesis is focused on design and optimalization of log splitter. Thesis consists of search of log splitter types and common used technologies, mechanical design, optimalization, design of propultion system, risk analysis and financial overview. Log splitter is designed to meet needs of automatization. Safety, industrial design and ergonomy has been considered in the design.
293

Návrh algoritmu výpočtu rotoru elektrického stroje s ohledem na napěťově deformační poměry a kritické otáčky / Design of computational algorithm of electric machine rotor with respect to stress-strain relationships and critical speed

Pařízek, Daniel January 2019 (has links)
The Master's thesis deals with the mechanical design of electric machine rotor. Within the first two chapters of the practical part of the thesis two simplified computational models of the rotor (level 1 models) are compiled. Specifically, the model of flexible rotor mounted on rigid supports and model of rigid rotor mounted on flexible supports. The essence of these computational models lies in solvability using simple equations. Using these models can save time when constructing a pre-design of the rotor geometry. The following chapter is devoted to comparing different approaches to computational modeling of rotor using FEM. A predetermined preliminary design of a high-speed massive rotor is investigated. Computational models of different levels at stress-strain analysis and modal analysis are presented. It also includes a suggestion on how to proceed effectively in a given analysis.
294

Návrh ražby a primárního ostění tunelu na stavbě vysokorychlostního železničního spojení / Design of excavation and primary tunnel lining on high-speed railway construction

Dostál, Tomáš January 2020 (has links)
As part of modernization of the Brno-Přerov railway line, is in the section between village Blažovice and town Vyškov desined tunnel composed of two monorail tubes about 640 meters length. Tubes are situated in neogenic clay with an overburden height of 11 meters. This master thesis deals with design suitable tunnel exavation, primary lining with static calculation and geotechnical monitoring.
295

Návrh zajištění stavební jámy hloubeného úseku tunelu na vysokorychlostní trati Brno-Přerov / Design of sheeting on a excavated section of tunnel on a high-speed line Brno-Přerov

Umlauf, Jiří January 2020 (has links)
In first part of the thesis are proposed four variants of retaining structures for deep excavation of cut-and-cover tunnel part. It is nailed slope, pile wall, nailed slope in combination with pile wall and soldier pile wall. For those structures is in following part carried out an economic analysis and the most cost effective variant is chosen. Chosen structure is further analyzed in next part. This analysis is carried out with finite element method in software PLAXIS. As a material model is chosen Hardening Soil model and input parameters were determined by empiric formulas from literature. Behavior of neogene clays, in which is the structure designed, is considered as undrained, by type Undrained A. In the last part of the thesis is described technological procedure of construction this retaining structure.
296

Mobilní stavební jeřáb nosnosti 200 kg / Mobile construction crane load capacity 200 kg

Tomeš, Jakub January 2020 (has links)
This diploma thesis describes mechanical design of mobile construction crane, specified for moving Silka bricks of weight 200 kg. Thesis contains constructing solution of steel frame - boom, column and chassis. Standard purchased components are also defined in this thesis - hydraulic circuits, el. pulley assembly and wheels. Last part of thesis verifies sufficient safety of designed frame using Finite element method. Output of this thesis are mechanical drawings of welded parts of steel frame and assembly drawing of entire crane.
297

Návrh testovacího stavu diferenciálu pro zástavbu v bezdozvukové komoře / Design of the Differential Test Rig for Testing in Anechoic Chamber

Ivanič, Michal January 2020 (has links)
The diploma thesis describes the design of a test stand for experimental determination of vibroacoustic parameters of a part of the powertrain system. Thesis contains a research part, describing the problems of the drive system, vibroacoustics, measuring devices and also the division and the description of test stands. At the same time, the reasons for choosing a closed loop test stand are explained. Thesis also includes the results of analytical calculations and numerical results of FEM methods performed using ANSYS software, as well as drawing documentation of individual parts.
298

Konstrukční návrh moderního těla reproduktoru s využitím nových technologií / Design of modern speaker body with usage of new technology

Kůst, Martin January 2020 (has links)
This diploma thesis deals with the analysis and design optimization of a speaker cabinet (enclosure) produced by the additive technology of 3D sand printing. The introductory part is devoted to the theory, both in the field of noise, vibration and the method of their calculations, as well as the theory of speakers and their systems. Numerical and experimental modal analysis is performed, which were compared to determine the mechanical properties of the new material, including material damping. This is followed by experimental and numerical harmonic analysis, with output in the form of a numerical model describing the behaviour of the structure during its excitation. The data are compared with a modal analysis of the internal acoustic space and the critical shapes and their frequencies are determined. At the end of the work, construction modifications are proposed to increase the rigidity of enclosures, the influence of which is evaluated on the created numerical models.
299

Metody hodnocení únavy materiálu konstrukčních uzlů tlakových zařízení s využitím výsledků numerických analýz / Fatigue evaluation methods for pressure equipment utilising numerical analysis results

Boleloucký, Václav January 2020 (has links)
Diplomová práce se zabývá hodnocením únavové životnosti v okolí konstručního uzlu tlakové nádoby, kde vzniká výrazná koncentrace napětí a je zde předpoklad primárního vlivu na únavu materiálu. Konkrétně se jedná o místo přechodu kontrolního otvoru do pláště analyzovaného zařízení. Práce obsahuje teoretickou a praktickou část. V teoretické části jsou představeny pojmy a metody hodnocení, související s danou problematikou. Na základě těchto metod je provedena analýza konstrukčního uzlu tlakové nádoby. Analýza je provedena metodou konečných prvků na skořepinovém a objemovém modelu nádoby v softwaru ANSYS Workbench, její výsledky dále zpracovány a vyhodnoceny dle aktuálního návrhu úpravy evropské harmonizované normy EN 13445--3, kapitoly 18. Výsledky analýz jsou hodnoceny v závěru práce.
300

Návrh přídavného pokládacího zařízení pro aplikaci rolí skelné geomříže GlasGrid® / Design of an additional laying device for the application of GlasGrid® glass geogrid rolls

Mikl, Marek January 2021 (has links)
The diploma thesis deals with the design of an additional device for the application of glass grid rolls GlasGrid® and functional calculations. Diploma thesis was created in collaboration with company Saint-Gobain ADFORS. The designed equipment must be able to lay all the currently produced sizes of the rolls, connectable to the widest possible range of laying machines and must be possible to transport the equipment over a longer distance. The laying equipment must also comply with the strength analysis and functional calculations.

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