|
|
Influence of eardrum perforation position and eardrum perforation size on ear sound transfer function
Straka, Martin ; Dušek, Daniel (referee) ; Pellant, Karel (advisor)
This thesis describes influence of eardrum perforation and perforation patching (myringoplastics) on sound transfer function. Perforation size, perforation position and inluence of graft material on hearing are discussed. This thesis is completed with 3D mathematical modeling in ANSYS system. The 3D finite element model of human ear is remodeled to represent the perforated and graft covered stage. Mathematical modeling is used for sound transfer calculations and for the discussions of the influence of tympanic membrane perforation on hearing. Set of audiological examination is processed and it is made the comparison between mathematical modeling results and audiology results.
|
|
|
Infuence of eardrum position on sound transmission
Krbálek, Jaroslav ; Dušek, Daniel (referee) ; Pellant, Karel (advisor)
The human eardrum is inclined at an angle of 50 ° t o the axis of external auditory canal. The main objective of this thesis was to determine the impact of the inclination on sound transmission characteristics of external ear canal. It was observed influence of the various features of the eardrum and of the malleus weight on calculated transmission characteristics. Simple finite element model (FEM model) was created in the ANSYS program. The acoustic subsystem of the outer ear tube, elastic eardrum and solid malleus were created. The external ear canal model was modeled as one sided open cylinder which was terminated diagonally bedded with eardrum. In addition to the impact of the eardrum inclination, the influence of the eardrum elasticity and the weight of malleus on the sound transmission characteristics of external ear canal was also monitored. The eventual presence of the coincidence effect was also studied.
|
|
| |
|
|
Design and realisation of 3D printer with high resolution of print
Peml, Luboš ; Hadaš, Zdeněk (referee) ; Dušek, Daniel (advisor)
This thesis deals with the design and realisation of the stereolithographic 3D printer using DLP projector. The work describes the selection of suitable components for the printer´s mechanical construction and manufacturing of this construction, the solution of printer´s electronics and creation of the printer´s host software and firmware. Recommendations based on executed experiments for the parameters´ values settings have been given here.
|
|
| |
|
|
Forensic Analysis of Web Browsers
Dušek, Daniel ; Burget, Radek (referee) ; Očenášek, Pavel (advisor)
This work deals with design and implementation of two tools related to web browser forensics. First tool implements functionality to safely delete user's private browsing data storedbyapplicationsGoogleChromeandGoogleChromium.Thesecondtoolontheother handtargetsonspecificuseridentificationbasedonhisbrowsingactivity.Incourseofdesign and implementation, the untill-now-inexistent documentation for Chrome's database was created. Implementation of secure deletion is realized using multiple overwrites of targeted files. Specific user identification tool uses researched columns' value meanings in order to identifyspecificuser.ReadercanbenefitfromsummarizedknowledgeofChrome'sdatabase structures and column value meanings.
|
|
|
Shape optimization of shield of asynchronous machine
Dítě, Pavel ; Hadaš, Zdeněk (referee) ; Dušek, Daniel (advisor)
The subject of this diploma thesis is to optimize the shield of asynchronous motor. In the thesis are given results of modal and the strain-stress analysis made for model of the shield, which is currently produced. To resolve this issue was used CAE programming system Pro/MECHANICA, which is based on method of geometric elements – GEM. The main output of this work is proposal of two new optimized shields of asynchronous motor and for these are presented results of modal analyse and the strain-stress analysis. Part of the thesis is design and technical-economic evaluation of casting methods for new shield production.
|
|
|
Rotor dynamics of asynchronous generator fast fixed with water turbine
Blažek, Petr ; Donát, Martin (referee) ; Dušek, Daniel (advisor)
This Master’s thesis deals with rotordynamics analysis of asynchronous generator rigid coupling with water turbine shaft. The purpose of this thesis was to determine influence of connection of generator with water turbine by rigid coupling to reactions in bearings. This problem was solved in two ways. The first option focused on model without influence of inaccuracies whereas there were inaccuracies included in the second option. The problem was solved by computational modeling by software Ansys.
|
|
|
Modelling of vibration of dynamic systems with n-degrees of freedom
Horák, Petr ; Hadaš, Zdeněk (referee) ; Dušek, Daniel (advisor)
The aim of this work is to assemble mathematical model for given system of point masses. Compute the natural frequencies and their corresponding modes of vibration. Differentiations of vibration by various points of view are written in this work. The given system is analyzed and the equations of motion using two most common methods are written. Calculation procedure of mentioned physical quantities is written in order from simplified to complete system of point masses. This procedure is used in command file to express values numerical. The frequency response of the system and the displacement-time plots are shown. The impact of constant variability entering the calculation is described.
|
|
|
Spectral properties of basilar membrane in the cochlea of the inner ear
Jozíf, Lukáš ; Dušek, Daniel (referee) ; Mišun, Vojtěch (advisor)
This thesis aims to verify the function of the cochlea as a spectrum analyzer based on computational modeling of macro-mechanics of the cochlea using FEM. I aim to identify the spectrum of the basilar membrane, which is dependent on the variability of geometry, material characteristics and the presence of liquid environments. Interactions between liquid and solid phases is described by fluid-structure interaction in the system ANSYS. The model is linear and does not pursue an active policy of metabolic processes. Further the work focuses on the decomposition of the sound and check of two best known hypotheses about the transmission frequency of the sound to the brain.
|
guest ::
RSS feed.