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Using finite element method for modelling of movement and stress of vocal folds during setting to phonation position
Šíbl, Michal ; Šidlof,, Petr (referee) ; Švancara, Pavel (advisor)
This Master´s thesis deals with use of finite element method for modeling motion and stress of vocal folds during setting to phonation position. The thesis contains a description of the relevant anatomical structures and of the closely related formation of the human voice. A list of some previously published models of the function of human vocal folds follows. A part of my work was to create a model of geometry of the larynx using CATIA V5 and PTC Creo 2.0 on the basis of data acquired by MRI (magnetic resonance imaging). After that the model was converted into the calculation system Ansys Workbench 15.0 and, for solving contact problems, into Ansys Classic 15.0. To solve given problems, these programs use the finite element method (FEM). Solution was carried out for six different variants simulating individual motions of cartilages, corresponding to the activation of individual muscles. For each variant, the movements and stresses in the soft tissue of the vocal folds were evaluated. For variants with activation of IA, TA and LCA muscle it was also evaluated the contact pressure between the vocal folds. Finally, the thesis mentions the preparation of the model for the activation of the vocal folds movement by the muscles of the larynx.
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Travelling Crab
Šíbl, Michal ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This thesis deals with proposal hoisting device of travelling crab with lifting capacity of 70 000 kg. The main objective is design of bearing elements of cable system – steel rope, pulleys and cable drum. The integral part of the thesis constitutes strength calculation of sheave block and design propulsion of hoisting device - motor, gearbox and brake. Drawing documentation shows sheave block, including piece list and drawings pulley, crossbeam, nut of crane hook and journal of pulleys.
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Using finite element method for modelling of movement and stress of vocal folds during setting to phonation position
Šíbl, Michal ; Šidlof,, Petr (referee) ; Švancara, Pavel (advisor)
This Master´s thesis deals with use of finite element method for modeling motion and stress of vocal folds during setting to phonation position. The thesis contains a description of the relevant anatomical structures and of the closely related formation of the human voice. A list of some previously published models of the function of human vocal folds follows. A part of my work was to create a model of geometry of the larynx using CATIA V5 and PTC Creo 2.0 on the basis of data acquired by MRI (magnetic resonance imaging). After that the model was converted into the calculation system Ansys Workbench 15.0 and, for solving contact problems, into Ansys Classic 15.0. To solve given problems, these programs use the finite element method (FEM). Solution was carried out for six different variants simulating individual motions of cartilages, corresponding to the activation of individual muscles. For each variant, the movements and stresses in the soft tissue of the vocal folds were evaluated. For variants with activation of IA, TA and LCA muscle it was also evaluated the contact pressure between the vocal folds. Finally, the thesis mentions the preparation of the model for the activation of the vocal folds movement by the muscles of the larynx.
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Adjustable Track of Tractor Rear Axle
Šíbl, Michal ; Slezák, Martin (referee) ; Dundálek, Radim (advisor)
This Master´s thesis deals with construction design adjustable track of tractor rear axle in a company Zetor Tractors a.s. At the very beginning there is an overview of different possibilities adjustable track from other world´s producers of tractors. Afterwards there is my constructional working from selection variant of suspension to final project. In this case the thesis contains required calculations of the whole device. Thesis also contains the stress and strain analysis of significant part of construction using a numerical approach of finite element method (FEM) and drawing documentation of the project constructed device.
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Travelling Crab
Šíbl, Michal ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This thesis deals with proposal hoisting device of travelling crab with lifting capacity of 70 000 kg. The main objective is design of bearing elements of cable system – steel rope, pulleys and cable drum. The integral part of the thesis constitutes strength calculation of sheave block and design propulsion of hoisting device - motor, gearbox and brake. Drawing documentation shows sheave block, including piece list and drawings pulley, crossbeam, nut of crane hook and journal of pulleys.
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