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Stress analysis and modelling of adhesive bonded joints with the use of Finite Element Method
Trubíniová, Karolína ; Horák, Marek (referee) ; Katrňák, Tomáš (advisor)
This bachelor’s thesis deals with the analysis of adhesive joints used in the aerospace industry by numerical solution using finite element method. The research section is focused on introduction to the topic of adhesive joints, the advantages and disadvantages they bring and their use in aerospace industry. The shear strength test using analytical approach is also part of this work. The practical part is focused on creation of 2D and 3D models of single lap joint test specimen and the subsequent strength analysis in MSC.Patran and MSC.Nastran. The output of this work consists of linear analysis of 2D and 3D problems, a non-linear analysis of 3D problem and comparison of results obtained by these methods.
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Stress-strain analysis of the process of continuous steel casting
Cabaj, Gabriel ; Petruška, Jindřich (referee) ; Návrat, Tomáš (advisor)
The thesis is focused on the development of a computational model for determination of stress and strain of a round billet in the process of continuous steel casting. The supplied material characteristics, the geometry of the continuous casting machine and the temperature distribution in the billet are applied as input data for stress and strain analysis. The computational model based on the finite element method is developed in the commercial software ANSYS. The thesis can be divided into three parts. The first part includes background information related to the continuous casting of steel and a research analysis of the computational modeling of this process. The second part describes the development of the planar and three-dimensional computational model in detail. Finally, the obtained stress and strain results are analyzed and general conclusions, and recommendations for further development are proposed.
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Design of the Parking Brake Mechanism
Hagara, Adam ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The main goal of the presented diploma thesis is the design and solution of the design of the parking brake mechanism. The theoretical part is devoted to a more detailed description and analysis of the current parking brake mechanisms, specifically the ratchet parking brake mechanism located in the automatic vehicle transmission. The starting point for the practical design part of the thesis is the preparation of conceptual designs together with determination of the most suitable and optimal concept of the mechanism. The next step is the detailed development of the chosen concept, which is accompanied by a series of calculations of individual components while complying with the given requirements. Subsequently, the functionality of the mechanism itself is verified using dynamic analysis, while individual verification states are verified and evaluated. At the end, the FEM analysis of the relevant components of the parking brake mechanism is also performed in order to confirm functionality, while based on the results, the optimization of the geometry of the relevant components is subsequently performed. The thesis also includes a drawing documentation attached in the annex of the thesis.
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Computational and experimental assessment of natural frequencies in a bladed disk system
Mekhalfia, Mohammed Lamine ; Procházka, Pavel ; Maturkanič, Dušan ; Voronova, Evgeniya ; Hodboď, Robert
This paper examines the modal characteristics of a bladed disk in rotating machinery systems using a combination of analytical and experimental modal analysis methods. The analysis involves measuring natural frequencies and mode shapes under different operational conditions. A comparative analysis is conducted to assess modal properties obtained from both analytical and experimental approaches, while also considering the influence of rotation speed. Additionally, Finite Element Method (FEM) outputs are used to accurately position the strain gauge. Integrating these techniques provides a comprehensive understanding of the bladed disk's behaviour under varying rotational speeds, enhancing result accuracy and facilitating thorough investigation within rotating machinery systems.
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Biomechanical study of the upper limb wrist
Kouřil, Jan ; Marcián, Petr (referee) ; Florian, Zdeněk (advisor)
This master´s thesis is focused on biomechanical study of wrist. There is a literature search on this theme in the beginning of this work. The thesis is described in detail anatomy of bones in the wrist. Subsequent the stress-strain analysis of physiological wrist is implemented in a neutral position. The model of geometry of wrist is created on base of CT data. To create calculation model and the solution is implemented in the computer system ANSYS Workbench.
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Wood-splitting machine
Svoboda, Vít ; Škopán, Miroslav (referee) ; Malášek, Jiří (advisor)
The objectives of the bachelor’s thesis is to make a short research about the cutting machines in general, compare the design, individual drives and the parameters of these machines. The next part is the emphasis on the actual construction of the machine, which is another goal of the work. At first, the frame is designed, then the hydraulic circuit of machine is designed by calculating and the last part deals with control and supporting calculations splitter component elements. The basic drawings of selected components of the splitting machine are parts of the work.
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Material nonlinear solution of beam structures
Kabeláč, Jaromír ; Krejsa,, Martin (referee) ; Návrat,, Tomáš (referee) ; Němec, Ivan (advisor)
The dissertation deals with solution of beam and frame structure considering material nonlinearity. The finite elements method (FEM) was used as calculation method. The objective of the dissertation was to develop and test finite beam element considering material nonlinearity. A detailed analysis of the problem provided a group of formulations of beam element. Part of the dissertation´s results has been, in several forms, implemented in commercial software. Beam element focused on solution of stress over solid cross sections is introduced in the theoretical part. In terms of topology it is a classical prismatic beam element with two nodes. Six degrees of freedom for translations and rotations are defined in each node plus 7-th degree of freedom for warping function from torsion. Load form axial force, bending moments, primary torsion, shear forces and eventually bimoment for secondary torsion were considered in cross section. Several variants of formulations were created according to inclusion of loading components into material nonlinearity and according to numeric integration method. Inclusion of geometric nonlinearity and fire resistance calculation are discussed in the dissertation. The above mentioned formulations were tested on prototypes as described in the application part which also provides information on the general procedure, architecture and technologies used for implementation of knowledge from the theoretical part into commercial FEM software. The dissertation shows implementation of plasticity for shell, solutions of cross section characteristics and stress on cross section, implementation of beam element with material nonlinearity and module for fire resistance of column. The above mentioned implementations of theoretical conclusions are the main outputs of the dissertation. These implementations are available in thousands of installations throughout Europe where being used at projection of significant constructions.
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Computational simulation of cross-roll leveling of rods
Benešovský, Marek ; Vrbka, Jan (referee) ; Petruška, Jindřich (advisor)
Final thesis describes two variants of computational models to simulate cross-roll leveling of rods, which are based on the Lagrangian approach to describe the continuum. Implementation of both variants was performed in ANSYS software, and their main difference lies in the choice of the type of elements for the discretization. An integral part of this thesis is the description of the principle, which is an evaluation of the curvature of the rod after completion of the simulation leveling. In the other part of the work are presented the results, which are then compared with realized experiment and simulation algorithm for cross-roll leveling based on the Euler approach. The final part is dedicated to the optimal settings of the leveller.
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Creation and analysis of electrical machines parametric models at CAD systems.
Chmelíček, Petr ; Janda, Marcel (referee) ; Kuchyňková, Hana (advisor)
Aim of this bachelor’s thesis is to demonstrate facilities of computer aided design on practical tasks. First part contains description of Autodesk Inventor, which is one of the most important modern parametric CAD systems. There is described the basics of modeling, drawing creating and analysis of design. Second part is oriented on demonstration of capabilities of Ansys Workbench, which is important system for solution of engineering problems by the finite element method. Also there is description of user interface of Ansys, analysis of electromagnetic field in asynchronous motor and description of one phase asynchronous motor. Task of last part is to create animated presentation of asynchronous motor with outer rotor in Inventor studio.
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Design and production of experimental axle part
Volfík, Jiří ; Slaný, Martin (referee) ; Zemčík, Oskar (advisor)
The content of this diploma thesis is a design of construction and selection of suitable material for upper-carrier part used for racing vehicle, produced by FDM 3D printing with the alternative option to replace an existing part, which was produced by conventional technique of CNC machining. Various versions of the experimental part are analyzed by FEM and compared in terms of safety coefficient with target to select the most appropriate construction design. The chosen version of the model is at the end compared with already existing part, which was also analyzed by FEM.
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