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Analysis of extensions for mounting a harvester head on an excavator
Popela, Dominik ; Struhal, Vít (referee) ; Mergl, Václav (advisor)
The introduction of the thesis deals with a complete research of individual components that need to be mounted on an excavator to make it possible to use it for forest harvest. An integral part of the research is a detailed market research, thanks to which various designs of manufactured attachments were analyzed. The research part is followed by a description of the selected components of the assembly, which form an excavator attachment for its use in forest harvest. The following chapter already describes the author's own designs of the extensions design in three variants. The key part of the thesis is dedicated to dynamic simulation of the harvesting process and strength simulations of the designed extensions. Using dynamic simulation, the course of the force effects acting on the attachment pin, which arise during the process of felling a tree, was determined. The maximum force effects were determined from the results of the dynamic simulation, which were then applied in the strength analysis. The finite element method was chosen for the calculation of the strength analysis. The final form of the individual design variants of the extensions arose from the performed strength analyses. The conclusion of the thesis evaluates the achieved results and a detailed comparison of the created design variants of the extensions.
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Crane crab of bridge rack crane of load 30 t
Kolegar, Vojtěch ; Bartušek, Filip (referee) ; Škopán, Miroslav (advisor)
This diploma thesis deals with mechanical design of crane trolley of overhead bridge rack crane with maximum capacity of 30 000 kg used for manipulation with steel coils. Diploma thesis is divided to several chapters. The beginning is dedicated to brief survey and definition of overhead cranes. First main chapter deals with draft and functional calculation of fundamental parameters of hoist mechanism and continues by selection and verification of individual parts of hoist mechanism. Second main chapter deals with design and description of construction of upper rotational frame of crane trolley, guiding pillar, and handling mechanism. Description of design of all construction is followed by determination of several loads of each construction part including the load factors for the correct dimensioning of their construction. The last chapter is static strength analysis of mentioned parts of bridge rack crane. A description of the procedure for creating a computational model, scenarios of load conditions is made and the whole chapter ends with evaluation of the results of the static strength analysis. The output of thesis are calculation report of hoist mechanism and his components, technical drawings of hoist mechanism, weldment of handling mechanism and upper rotational frame with guiding pillar and handling mechanism.
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Equipment for handling the switchgear panel
Brauner, Jiří ; Černohous, Josef (referee) ; Kašpárek, Jaroslav (advisor)
The work deals with the design of a handling device used for lifting, rotating, and moving a switchboard. The first part of the work includes a review of technologies for handling large loads. The second part contains a summary of legislative regulations for handling switchboards. Furthermore, the work includes the design of the handling device, comprising the concept design, construction design, and strength verification of selected structural nodes.
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Analysis of the crank mechanism of a two-stroke engine
Matyáš, David ; Píštěk, Václav (referee) ; Svída, David (advisor)
This diploma thesis is a comparison of two versions of the crank mechanism of the Jawa 350 two-stroke engine. The diploma thesis if prefaced by researching the design solutions of multi-cylinder two-stroke engines with examples of their use. The following is a description of the theoretical properties of the two examined crank mechanisms in terms of inertial effects. For both engine concepts, the engine performance characteristics is measured and compared to each other. The engine with modified crankshaft is subjected to a pressure indication, which serves as one of the inputs to the strength analysis of the crankshaft. This is done by a combination of MBS simulation, FEM analysis and calculation of fatigue safety factor by LSA analytic method.
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Formula Student Front Wheel Carrier Design
Černý, Filip ; Porteš, Petr (referee) ; Ramík, Pavel (advisor)
This thesis deals with the design of the front wheel hub and upright of Formula student car. First component is a short search on Formula Student event and comparing diverse structures of upright for use in both racing and road cars. It also includes design of hub and upright in the CAD program and computational model of the upright created in FEM program specifically for stress analysis in selected conditions. It also includes optimization of the overall proposal.
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Retractible landing gear design for Z 143 LSi airplane
Gregor, Jiří ; Vaněk, František (referee) ; Píštěk, Antonín (advisor)
The diploma thesis deals with the design of the replacement the Z 143 LSi landing gear with the new VUT 100 type landing gear in a retractable system. The first part of this thesis is devoted to the description of the Z 143 LSi aircraft and its landing gear and the description of the retractable landing gear type VUT 100. The next part describes the possible variants of the installation the VUT 100 landing gear, which are critically evaluated. Then there is selected the final variant for the installation, which is designed in Catia V5 software. The final design includes remotorization with Lycoming IO-390 and new design of engine bed. For the proposed solution, a new mass analysis with the calculation of centrations, new cases of ground load, a new flight envelope of load and additional cases of load of a new engine bed are prepared. The proposed engine bed is analyzed by the finite element calculation method in the MS Patran software. Finally, a possible scheme of the chassis retraction system is proposed.
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Engineering design of the vehicle suspension rocker
Poláček, Vojtěch ; Ramík, Pavel (referee) ; Bradávka, Marek (advisor)
Diploma thesis deals with the design and stress analysis of the rocker suspension for an autocross car. The research describes some real cases of using suspension with pushrod and rocker in motorsport. Subsequently, the work deals with the design of the wheel bump/rebound limiting stops and bump/rebound measuring. The challenge is to design a component shape, size and select fit of a rocker with an emphasis on low weight whilst maintaining sufficient strength and rigidity. The design study include stress analysis which leads to optimize the final shape.
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Tubesheet analysis according standards and FEM
Horniak, Patrik ; Vincour, Dušan (referee) ; Pernica, Marek (advisor)
The focus of this master’s thesis is strength design of tube sheet, which is part of shell and tube heat exchanger, with fixed tube sheets. This tube sheet is integrated with both shell and channel of the heat exchanger. First part of the thesis is focused on literature review of shell and tube heat exchangers, tube sheets and calculation standards, which are used for their strength design. The strength design of tube sheet is presented in second part of the thesis, according to the standards: ČSN EN 13445, ASME BPVC VIII and TEMA, along with comparison of these standards. Last section of the thesis deals with the implementation of FEM analysis and its comparison to the analytic approach of strength design, used in accordance to the standards mentioned above.
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Renovation of escalator
Kobzík, Martin ; Šebesta, Luděk (referee) ; Pokorný, Přemysl (advisor)
This master's thesis covers the construction analysis of an escalator by the Otis a.s. company and the conception of its modernization called "In-truss".This type of modernization consists in preserving the supporting construction of the 506-type escalator into which the components of newer 506-NCE series are to be built in. Such operation requires modifying the construction and creating adaptors used to anchor the new components to it. These modifications lead to the stress testing of the construction, that is done by using the finite elements method in NX-Ideas software. The thesis contains the design of selected subsystems of the escalator, the stress testing of the new supporting construction and the creation of volume model in CREO-Parametric application for further use.
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Stress-strain analysis of artery with atheroma
Janík, Rostislav ; Fuis, Vladimír (referee) ; Burša, Jiří (advisor)
This master thesis analyses stress and strain of iliac artery with atheroma. Model of artery is created as 3D and symmetric in the longitudinal cut. The first part of the thesis deals with a research, which includes obtaining information from medicine, which is necessary fort the right solution of the task. Next part dedicates to nonlinear mechanics, constitutive modeling from the view of biomechanice and computational modeling of arteries. In the next part is made analysis for load on artery by increased blood pressure. In the end were specified uncertainties of the used model and evaluated chance of atherosclerotic plaque rupture.
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