National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
The design of eye-lens simulator
Špaček, Matěj ; Rebenda, David (referee) ; Nečas, David (advisor)
The aim of this bachelor thesis is a design of an eye-lens simulator. Tribometer module in pin-on-ring configuration was designed to allow direct observation of a contact zone. The survey of existing tribometers was conducted as a part of the thesis, based on which, three concept solutions were suggested. Final solution of the module was chosen and designed based on the concepts. The apparatus enables to simulate conditions of real human eye so it could contribute to a contact lens research and eye lubrication solution development.
3D print of gearbox housing model
Kopecký, Marek ; Rebenda, David (referee) ; Dočkal, Kryštof (advisor)
This bachelor thesis focuses on the design of two stage spur gearbox housing for food processor. Strength calculation was conducted using FEM analysis. State of the art from the field of transmission casing, CAD model and prototype created by 3D print are parts of the thesis. 3D printed model is meant for demonstration of bearing seats and use of normalized mechanical elements. The thesis should provide fundamentals of gearbox housing and show a solution of one case.
Press design for paper briquettes
Kočař, Jiří ; Rebenda, David (referee) ; Dvořáček, Jiří (advisor)
The bachelor thesis deals with an engineering design of a press briquette machine, which process refuse of paper. This refuse is used for production of paper 's, eventually paper-sawdust 's briquets. The first part contains analysis of options of processing garbage, current machines producting briquets and their versatility. The second section is focused on a final design of a pressing machine and a general description of it's parts.
Experimental study of friction in articular cartilage
Praus, Tomáš ; Vrbka, Martin (referee) ; Rebenda, David (advisor)
This thesis deals with the experimental study of friction in articular cartilage. After the introduction to biotribology, there are described a principle of measurment on the Mini-Traction Machine and a brief description of machine itself. After that, there is a propose for a preparation and storage of cartilage samples, construction of the adapter into the MTM and research of the friction coefficient. The results of experimental research showed the negative effect of storing the samples in the refrigerator. On the other hand, the measurement of the friction coefficient of the samples stored in the freezer showed the preservation of the mechanical properties of cartilage. Even load and speed of loading have a big effect on friction. When the speed increases, the coefficient of the friction increases too. There is an extreme increase of the friction at higher speeds. But with increasing load the friction coefficient decreases.
Lubrication of hip joint replacements
Rebenda, David ; Hartl, Martin (referee) ; Vrbka, Martin (advisor)
This thesis deals with the experimental study of lubrication of hip joint replacements. The influence of the synovial fluid composition and the head material to the lubricating film thickness were asssesed by using a pendulum hip joint simulator. Both of these effects were assesed under static and dynamic loading conditions. The experimental results showed that the movement of the head against the cup is unnecessary for the separation of the rubbing surfaces by a layer of adsorbed proteins. Composition of the synovial fluid then significantly influences the thickness of the lubricating film. Two opposite extremes have been observed during tests with two model synovial fluids. The first fluid formed a very strong lubricating film. The second sample almost prevent adsorption of proteins and consequently formed only very thin lubricating film. The influence of the material is noticeable when comparing the results obtained with a metal head and ceramic heads. Metal head formes under the same conditions thicker lubricating film. This evidence may be partly influenced by different diametrical clearances, which were in the case of ceramic heads higher.
Design of mechanism for pronation and supination of the upper limb prostheses
Rebenda, David ; Košťál, David (referee) ; Paloušek, David (advisor)
The goal of of this work is to propose a mechanism for pronation and supination of the upper limb prosthesis and its subsequent implementation of functional prototype. The teoretical part summarizes the basic types of forearm amputation and the effect of restricting rotation of the forearm. It also describes the basic distribution of upper limb prostheses and drive types. Construction design includ complete technical documentation is made in Autodesk Inventor Professional 2013 and Rhinoceros 5.0 SR8. The prototype is made of aluminium and ABS plastic.

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