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The High Pressure Fuel System Application for CI-engine
Ševčík, Ondřej ; Prokop, Aleš (referee) ; Dundálek, Radim (advisor)
This thesis focuses on the design of new high pressure injection system application on diesel engine. The design came from company Zetor’s demands. For this application was chosen system Common Rail supplied by company Bosch. Assignment was separated into several tasks. Research of suitable components for low pressure section, design of waste system and high pressure injection tubes design including injector clamping. Due to injectors used in this system was necessary to redesign cover for valves and even new system to lead wires from outside of the engine to injectors. Injector is attached by screw connection, which is composed from screw and clamping jaw. These parts are subjected to an analytic calculations. Clamping jaw of injector is even subjected to a FEM analysis, which focuses on fatigue life. Finally, the drawings were documented.
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Test stand for testing of frame and fork of scooter
Kostka, Marek ; Klapka, Milan (referee) ; Brandejs, Jan (advisor)
The aim of this bachelor thesis is construction design of the testing station for tests of cyclical straining of the frame and fork of the footbike in loading by men in weight from 50 to 150 kg and in kick frequency from 10 to 120 kicks per minute. The format of this work is divided into four main parts. In the first part is this work orientated to actual demands of the footbike. In this part is also described construction design and solution of other testing stations. In other part of this work is accomplished analysis of powers which influent footbike and there are defined particular parameters for testing station. In the third part is described possible approach to solution of testing station and to particular contructional nodes. Last part of this work talks about the resulting proposal of constructional design of the testing station.
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Mechanical design of stend for lower limbs prostheses dynamic testing
Taufer, Tomáš ; Robenek, Dětřich (referee) ; Paloušek, David (advisor)
This work describes design and realization of testing device for dynamic tests of foot prosthesis, made by methods of Rapid prototyping. Primary objective of design is to imitate the load on prosthesis during human gait. This task is accomplished by swing motion of prosthesis inside the frame of device during the loading of heel and tiptoe. Loading components can be removed and changed so the device can be used for different measurement like walking on an inclined plane. The result of this work is fully functional device including control program with many options to control the test. The result of test is to decide whether the foot prosthesis withstands the set of cyclic loads. The area of development of prosthesis by additive methods is young for the time being. It stands out especially with different materials, design, structure of prosthesis and fast process of production. Therefore this device can be used for testing of fatigue life of prosthesis made by additive methods.
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Engineering optimization of a bolted joint under cyclic load
Pavlíček, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
This bachelor’s thesis deals with improving the service life of a cyclically stressed screw connection. In order to correctly determine the tension amplitude in the screw, it is necessary to know exactly the stiffness constant of the connection C. In this work, a comparison of analytical approaches for its calculation was made for a connection with a screw-in head screw. Based on a comparison with the numerical solution, it was evaluated as the most accurate approach according to the VDI 2230 standard. Furthermore, the influence of the size of the preload value on the life of the screw was assessed. It was found that the optimal value of the preload corresponds to the state when the clamping of the connected parts is lost. The last part of this work was focused on structural modifications that will improve the service life of the joint. The following design modifications were assessed: flexible screw, large area and spacer washer. The most significant increase in service life was achieved using a spacer washer.
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Návrh silového členu simulátoru zátěže pro dlouhodobé zkoušky VTG aktuátoru
VANĚK, Daniel
The topic of diploma thesis is focused on the design of the life of the power member of the preparation with springs (the load simulator). The preparation is used for long-term testing of VTG (Variable Turbinen Geometrie) actuators. The diploma thesis follows the author's bachelor's thesis (Vaněk, 2019). The theoretical part is focused on the fatigue of the material, the geometry of the used springs, the decomposition of the test profile using the Rain flow method and the Matlab (interactive software). The practical part of that thesis deals with the analysis of the test profile, the calculation of the accumulation of damage and the statistical evaluation of the service life of the used springs.
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The High Pressure Fuel System Application for CI-engine
Ševčík, Ondřej ; Prokop, Aleš (referee) ; Dundálek, Radim (advisor)
This thesis focuses on the design of new high pressure injection system application on diesel engine. The design came from company Zetor’s demands. For this application was chosen system Common Rail supplied by company Bosch. Assignment was separated into several tasks. Research of suitable components for low pressure section, design of waste system and high pressure injection tubes design including injector clamping. Due to injectors used in this system was necessary to redesign cover for valves and even new system to lead wires from outside of the engine to injectors. Injector is attached by screw connection, which is composed from screw and clamping jaw. These parts are subjected to an analytic calculations. Clamping jaw of injector is even subjected to a FEM analysis, which focuses on fatigue life. Finally, the drawings were documented.
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Factors affecting the properties of glued joints for glues used in the wood industry
Boška, Pavel ; Böhm, Martin (advisor)
Dissertation focuses on the influence of selected factors on the properties of the bond glued by acetate polyvinyl adhesives. Factors such temperature and moisture content of the environment, the pressing pressure and cyclic stress. Despite the same type of adhesive, the properties may vary for different producers of adhesives and according to which the product is not intended. Influence will be compared to the test samples of dried beech timber with regard to shear bond strength. They will be compared properties of adhesives from different manufacturers and different destination. Test samples and test progress carried out in accordance with current standards, or largely based on. This research should help users streamline the process of adhesive bonding and reduce the production costs of the bond.
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Trends in the design and creation of new materials
Kašičková, Václava ; Gaff, Milan (advisor) ; Babiak, Marian (referee)
Thesis investigates the flexural properties of modified laminated wood. Thesis examined two wood species - beech and aspen. The aim was to describe effect of wood species, material thickness, densification, adhesives and loaded cyclic stress on selection of mechanical properties.
Wood species and thickness of material were determined as factors with very significant impact. They affected modulus of elasticity, limit of proportionality and bending strength. All these characteristics achieved higher values while testing beech lamellas. Degree of densification does not appear as a very significant factor. Comparing modulus of elasticity in this thesis and data given in the literature it is possible to say that densified lamellas used in this research reached higher values.
This thesis also investigates tensile-shear strength and bendability.
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Trends in design and development of new materials
Jiřištová, Eliška ; Gaff, Milan (advisor) ; Kminiak, Richard (referee)
This bachelor thesis is focused on trends in design and production of new materials, especially materials made of wood or other natural materials. First part of this thesis provides survey about different ways of wood modifications, which lead to production of new materials. There is an overview of well known modifications and treatments of wood with some examples. Further there are presented three new ways of wood modifications. In the next part there is a description of chosen materials, which are based on wood or other natural materials. These materials are made with respect to environment. They are new on market and they have big potential, mainly because of their unusual design and eco-friendly production.
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