|
|
Computational analysis of column for horizontal boring centre
Fargač, Michal ; Vosynek, Petr (referee) ; Hadaš, Zdeněk (advisor)
The theoretical study of this thesis deals with different approaches that can be used to optimize the topology of various structures. Main attributes and principles which they are based on of individual methods are discussed. The first point of the practical part is to design the model for computational analysis of stand and other machining centre parts based on real machine TOS FU. Afterwards, the model is analyzed to determine the dynamic characteristic of the machine. Subsequently, several changes of the stand design are performed in order to improve the dynamic behavior. Eventually, new stand kernel is designed which aims to enhance these dynamic characteristic. This model is analyzed again and the results are compared with the original form of the machining centre.
|
|
|
Stress and deformation analysis of the stem and cup of the total replacement of the trapeziometacarpal joint
Svojanovský, Tomáš ; Vosynek, Petr (referee) ; Fuis, Vladimír (advisor)
The center of attention of this bachelor’s thesis is stress and deformation analysis of the total replacement of the trapeziometacarpal joint. The first part is formed by medical essence of the matter, namely from the anatomical and pathological point of view. The connecting link between literature research and analysis creates a short introduce to the finite element method. To the stress and deformation analysis itself was used the program ANSYS Workbench 14.5 based just on the finite element method. One of the purposes is to get to know this program and to learn to gain correct results. The main target is to catch and describe stress and deformation of the simplified model of a certain implant. Despite some of the simplifications, resulting values should approach to the real values. Except for the mentioned analysis, there are introduced different approaches, which could be used for the solution. There is also some comparison of advantages and disadvantages of particular approaches.
|
|
|
Analysis of the use of 3D slicer SW for computational modeling in biomechanics
Kratochvílová, Hana ; Marcián, Petr (referee) ; Vosynek, Petr (advisor)
This thesis deals with a freeware program called 3D Slicer and its usefulness in the area of biomechanics. The introduction part describes the scope of the program and its functions. The next chapter shows a step-by-step modelling of a bone geometry using CT images and a comparison of geometries of bones created with different grayscale level using a program Gom Inspect. The last part focuses on importing geometries created in 3D Slicer, specifically femur and pelvis, into FEM platform ANSYS Workbench for preprocessing and defining femur’s stress and deformation characteristics.
|
|
|
Strain, stress and safety analysis of the car reinforcement frame
Dobeš, Martin ; Vosynek, Petr (referee) ; Vrbka, Jan (advisor)
This master thesis deals with the strain, stress and reliability analysis of the safety frame of racing car. The safety frame is a part of passive safety, which it becomes active in a case of impact. The safety frame makes a reinforcement of the car body and provides its sufficient stiffness. The first part of the master thesis is focused on determination of stress and strain states during the static loading tests and their analysis. The loading conditions are prescribed by homologation regulations of Fédération Internationale de l´Automobile (FIA). The problem is solved, making use of computational modeling utilizing the Finite Element Method (FEM). The first part of thesis is used for the stiffness and safety analysis under the static loading test. The second part deals with the effect of loading velocity on the stress and strain states using the computational modeling and solver LS-DYNA.
|
|
| |
|
| |
|
| |
|
|
Strain-stress analysis of the surface replacement of the hip joint
Vosynek, Petr ; Janíček, Přemysl (referee) ; Návrat, Tomáš (advisor)
Today is the surface hip repacement very often surgery becouse of new studies and improvements. For young and active people it's the best way to delay implantation of a total hip replacement. The objective of this study was to perform finite-element analyses of computational model of the partial/total surface replacement, conventional partial/total replacement and physiological hip joint. We obtained strain-stress states from these analyses. All results were compared one another and then were confronted with results of the physiological hip joint. The three-dimensional computational model consists of these components: sacral, pelvic and femoral bone, muscles, artificial socket, and surface hip replacement. We were using FEM system ANSYS. The geometrical models of bones were generated by means of computed tomography (CT) images. The FE model of bone reflects two types of the bone tissues (trabecular and cortical bone) and muscles which are important when standing on one leg. The model of the muscle corresponds to isometric contraction. The implants material and bone tissues were modelled as isotropic linear elastic material. The model was loaded by force, corresponding to load by standing on one leg.
|
|
|
Analysis of methods of modeling bone loss due to osteoporosis
Orlová, Lucie ; Marcián, Petr (referee) ; Vosynek, Petr (advisor)
Tato bakalářská práce se zabývá biomechanikou kosti. Hlavním cílem je teoretický průzkum řešení pro výpočtové modelování dlouhých kostí a změn této struktury vlivem osteoporózy. V rámci rešerše jsou vysvětleny související biologické pojmy a základní principy mechaniky. Na základě informací shromážděných v teoretické části práce jsou provedeny výpočty pomocí metody konečných prvků v programu ANSYS.
|
|
|
Analysis of the use of the "instant center of rotation" method in the calculation of atypical welds in numerical computational modeling
Babišta, Jan ; Pokorný, Jan (referee) ; Vosynek, Petr (advisor)
The usage of welding for connection of two materials is common method for its speed, economy and its potential automatization. But when the statically loaded weld connection is designed and simulated using FEA, the singularity appears, so the deformation and stress can’t be presented as relevant. For elimination of this influence the Instantaneous center of rotation (ICR) method can be used. This method assess only the angles of reaction force from segments of weld. This thesis is focused on the effect of material, geometry, loads, supports and magnitude of loading force on the position of ICR. In the first part of thesis, the ICR method is compared with elastic method, which is the other potential method for weld assessment. The basics of each method are presented. For the second part, the normativ design of weld is created and assessed using both of potential methods for solution. The numercial model is created in the next step. The model is then calculated for numerous combination of materials, geometry, FE mesh and loads. Last part of this theses the results are compared between numerical and analytical solution of position of ICR. Also the best combination of geometry and material was chosen for the best results.
|
guest ::
