National Repository of Grey Literature 32 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Reconstruction of undetachable LORD MR damper
Lochman, Vít ; Macháček, Ondřej (referee) ; Mazůrek, Ivan (advisor)
The bachelor´s thesis deals with the design and the realization of the modification of the non-demountable magnetorheological damper LORD, which has gained an atypical Fv characteristic in the course of time. The first part of the thesis deals with the operation of the magnetorheological liquid and the various design variants of the magnetorheological dampers. The practical part is devoted to the reverse engineering and the design of the damper modification itself. The complete drawing documentation of the original and the modified damper is included in this work.
Design of a device for the analysis of hydraulic damper valves
Čupr, Martin ; Jeniš, Filip (referee) ; Macháček, Ondřej (advisor)
The bachelor thesis deals with the design of a device for a stand-alone hydraulic damper`s valve analysis. The main goal is to construct a jig, where the valve is firmly attached, so it can be exposed to high-pressure oil flow, simulating the real conditions in a damper. In this thesis, the valves of the two specific hydraulic dampers were chosen. The jig was designed to enable testing of these valves loaded by operating pressure up to 32 MPa. As the jig is universal, it allows testing of any similar-sized valves. Moreover, it provides the possibility to test two valves at the same time and analyse their cooperation. The jig presented in this thesis was designed for the development purposes. However, the same principle can be used as a control jig in serial manufacture. This approach enables to measure both the valve`s pressure drop and the current volumetric flow rate of oil. Consequently, all the main characteristics of the valve which are derived from these two quantities can be invetigated. When the cooperation of two valves is analysed, the ration between volumetric flow rates in each valve can be determined.
Mechanical design of experimental collimator
Toman, Ladislav ; Macháček, Ondřej (referee) ; Klapka, Milan (advisor)
The bachelor thesis deals with the mechanical design of the correction collimator, which is used for the axial rotation of the optical assembly, and also with the mechanical design of the device for height positioning of the auxiliary telescope of correction collimator. The bachelor thesis is divided into six main chapters. These chapters deal with the principle of the optical systems functionality, the principle of the correction collimator functionality, there are also mentioned types of correction collimators, there is description of the problem, individual proposals of the two preparations, their analysis, selection of suitable variants and their design solutions. Drawings of individual parts and assemblies are part of the bachelor thesis.
The study of the MR fluid for space applications
Macejka, Andrej ; Macháček, Ondřej (referee) ; Kubík, Michal (advisor)
This bachelor thesis is concerned with study of off-state rheological properties of magnetorhelogical (MR) fluid. The purpose of this thesis is to define measurement metodology and evaluation inherent rhelogical properties of MR fluids in wide temperature range.
Design of front wheel suspension and modification of steering of racing pneumobile
Zvoníček, Josef ; Macháček, Ondřej (referee) ; Ranuša, Matúš (advisor)
The bachelor thesis focuses on the structural design of steering of the racing pneumobile. The thesis includes the analysis of the original state of the vehicle and explores the ideas for modifications. The final part of the thesis describes the construction of steering along with the drawing documentation.
Process Improvement of Stock Record in Production Company
Macháček, Ondřej ; Čajan, Tomáš (referee) ; Bartošek, Vladimír (advisor)
The bachelor thesis focuses on improvement of evidence of tools in company Dakin Device Czech republic s.r.o. In the theoretical part are characterízed basic concepts and methods of stock management and processes. The next part of thesis is focused on the analysis of current process with use of appropriate mehtods. In the final part of the thesis new process is proposed.
Java Bytecode Disassembler
Macháček, Ondřej ; Letko, Zdeněk (referee) ; Fiedor, Jan (advisor)
This thesis focus on the structure of Java class file and disassembling bytecode instructions of Java language. Part of this thesis is a library, for disassembling Java class files. With this library one can explore the structure of a disassembled class file. Another part is a graphical application, which shows how to work with library.
The construction of MR damper for MTB fork suspension
Salva, Matúš ; Macháček, Ondřej (referee) ; Strecker, Zbyněk (advisor)
In MTB is front suspension very important part of bike. It ensures comfort of ride and security. This Bachelor thesis deals with the theoretical design of semi-active suspension for MTB fork. For this purpose of simulation models of suspension used adaptive damper and MR damper with Skyhook algorithm were made. Range of forces for MR damper for use in MTB was made on basis of simulation. Simulation results of semi-active suspension were compared to simulation results of adaptive suspension which contained F-v characteristics of damper used in downhill bike. MR damper with Skyhook had better results in field of riding comfort and it retained adhesion of adaptive damper. Final range of forces for MR damper in possible to use for more tests or for design of MR damper for fork of mountain bike.
Design of the jig for an injection mold parts
Macháček, Ondřej ; Roupec, Jakub (referee) ; Prokeš, František (advisor)
The basic aim of this bachelor’s thesis is design of jig for alignment position of an injection mold parts. Specifically it is used for production of plastic bearing cages, manufactured by INA LANŠKROUN Inc. The solution is based on the jig used today and tries to improve it. The essential outcome is complete design documentation.
Magnetorheological Strut for Vibration Isolation System of Space Launcher
Macháček, Ondřej ; Borin, Dmitry (referee) ; dr hab. inż. Janusz Gołdasz, prof. PK (referee) ; Mazůrek, Ivan (advisor)
Práce se zabývá návrhem magnetoreologické (MR) vzpěry vibroizolačního systému (VIS) pro kosmický nosič. V rešeršní části jsou popsány vybrané VIS a vzpěry těchto systémů, které byly v kosmických nosičích využity v minulosti. Každá z těchto vzpěr obsahující kapalinu byla těsněna pomocí statických těsnění a pružných vlnovců vyrobených z oceli. Důkladněji byla analyzována vzpěra pasivního systému VIS s označením ELVIS, jehož konstrukce se stala inspirací pro tuto práci. Jedná se o tříparametrický systém, v němž je tlumič uložen na pružině, jejíž tuhost přibližně odpovídá objemové tuhosti vlnovců respektive jejímu průmětu do axiálního směru (pressure thrust stiffness). V práci je představena metodika pro stanovení “pressure thrust stiffness” na základě geometrie vlnovce a také uvedeny parametry vlnovce díky kterým je možné měnit poměr mezi axiální a “pressure thrust stiffness” vlnovce. Tento poměr ovlivňuje v dané koncepci vzpěry její dynamické chování a tím i chování celého VIS. Pro predikci dynamického chování vzpěry byl vytvořen multi-body model VIS založeného na Stewartově plošině a detailnější model jediné vzpěry. Simulace provedené v tomto modelu odhalily parametry, které mají vliv na výkonost tlumiče ve VIS: časová odezva a dynamický rozsah. Díky modelu byl určen rozsah těchto parametrů, ve kterých bude zaručena efektivní funkce vzpěry ve VIS, konkrétně: časová odezva: 0-5ms, dynamický rozsah: 5-10. Před finálním návrhem vzpěry byla sestrojena vzpěra experimentální vzpěra, jejíž parametry byly přesně naměřeny a využity pro verifikaci jednotlivých modelů. Poznatky získané během experimentů byly využity při návrhu finální vzpěry. Jeden z nejdůležitějších poznatků byla nutnost náhrady feritového magnetického obvodu s ohledem na jeho křehkost. Proto byl odvozen tvarový přístup k navrhování rychlých magnetických obvodů z oceli s využitím 3D tisku, který byl následně patentován. Navržená vzpěra obsahuje magnetoreologický ventil jehož odezva je predikována na 1.2 ms a dynamický rozsah 10. V závěru práce je představena metodika, díky které byla vzpěra navržena.

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