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The beginnings of the application of finite element method in biomechanics
Hájek, Petr ; Řehák, Kamil (referee) ; Florian, Zdeněk (advisor)
Bachelor’s thesis is aimed to beginnings of the application of finite element method in biome-chanics. We can define the period of beginnings by the ages 1972, when Brekelmans et al. introduces the method in biomechanics, and 1983, when the method was well established in this field. The main part of the thesis is research study describing this period, presents author (or author’s group), model used, a focus of their work. The works of some authors are discussed in detail; other works are mentioned more marginally. Beside the research study, there is a strain-stress analysis of femur in the thesis, which summarizes basic findings from research study. This is a practical application of the finite element method.
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Attached Apartment House - Plumbing Systems
Hájek, Petr ; Vrána, Jakub (referee) ; Bárta, Ladislav (advisor)
Abstract in English language Bachelor's work deals with sanitation instalations and gas piping. The teoretical partdeals with design management of rainwater and implementation of retention tanks and infiltration facilities . Calculation and project part contain design of water installations, drainage, gas piping in building and their connection to present technical networks. The object is a basement apartment terraced house on four floors.Project was done according to current czech and europe regulations.
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Application of Fluid-structure Interaction on Oscillating Human Vocal Folds
Meisner, Patrik ; Švancara, Pavel (referee) ; Hájek, Petr (advisor)
The presented thesis is involved in the biomechanics of phonation. The aim of the thesis is to set a fluid-structure interaction between the vocal folds and air flow when the pressure from lungs reaches the physiological values. In the expected outcome the self-oscillating vocal folds should be observable with characteristics shape-shift from convergent to divergent. In theory part of the thesis is described Anatomy of the vocal tract, physiology of the human phonation, research of computational simulations, experiments and visualisation methods are described in the theory part of the thesis. In the second part, setup of computational simulation with the finite element method is presented. Besides of the fluid-structure interaction the acoustical model is set. Achieved results are presented and compared to the results in literature. Displacements are evaluated from the structural model and pressures, velocities and flow velocities are evaluated from fluid model, so as acoustics results.
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Simulation of the sound transfer via human ear
Hájek, Petr ; Švancara, Pavel (referee) ; Pellant, Karel (advisor)
The presented thesis concerns the biomechanics of hearing. The main aim of this work is the determination of so called corrections which allow for the comparison of synthetic audiograms and measured audiograms. With these corrections we attempt to overcome the discrepancy that exists between the computational modelling and audiological measurement. The discrepancy lies in a fact that the computational modelling usually simulates the sound coming from a free eld to the external auditory canal, while audiological measurement is realized by audiological headphones, whether the auditory system is healthy or injured. Then corrections adjust the computational model so that the obtained result is comparable to audiological measurement. In this work is also addressed the influence of stapes kinematics to the excitation of basilar membrane. The movement of stapes consists of piston-like movement and rocking movement. The computational simulation shows which movement is more signicant for the excitation of basilar membrane and how this effect can be used in otosurgery, in particular, for type IV of tympanoplasty.
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Computational modelling of aerodynamic noise of flow past a solid body
Sýkora, Daniel ; Hájek, Petr (referee) ; Švancara, Pavel (advisor)
Diploma thesis is focused on computational modelling of aerodynamic noise of flow past a solid body. Computation of flow around a cylinder is performed for different meshes and time steps in initial part of the thesis. Results from every computation are compared. Computation aerodynamic noise due to flow around a cylinder is simulated in other part of diploma thesis. In the second benchmark computation, turbulent models have to be considered, because flow with high Reynolds number is turbulent. Computation is based on two different ways: acoustic analogy and direct method. A few different turbulent models is described and is analyzed influence to modelling aerodynamic noise. The results and knowledge of the benchmarks computation have been used in compu-tational modelling of aerodynamic noise of flow around simplified side view mirror. Surface (2D) and spatial (3D) simulations are performed. Based on computation modelling of aerodynamic noise of flow around simplified side view mirror has been designed new geometry, that aim is reduced aerodynamic noise and improved aerodynamic parameters.
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Analysis of the effect of insulation on the housing unit price in a non-standard house in Brno
Hájek, Petr ; Hlavinková, Vítězslava (referee) ; Adámek, Jiří (advisor)
Assessing the impact of insulation on the price of immovable assets and return on such an investment. The work is based price of the thermal insulation on the specific model of the object and the subsequent conversion of prices on selected housing unit. Housing unit is also measured using current valuation rules, as well as by market valuation. Create Database insulated and non-insulated housing units and the difference between their prices is determined by the value of work compared with the cost model chosen insulation unit. Subsequently, the price is compared to the insulation housing units with insulation effect on the market price of the apartment. The paper assessed the state of energy consumption before and after the insulation work. The work is conceived as a breakdown of theoretical information, which are then practically applied to the object model. Calculations are therefore linked with the text part of the thesis.
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Torsion of bars with noncircular cross section
Votava, Ondřej ; Hájek, Petr (referee) ; Profant, Tomáš (advisor)
The aim of this bachelor's thesis is the problematics of twisting of bars with non-circular cross-section. In order to solve this problem, analytical and numerical methods are used. The theoretical part deals with the derivation of elementary relations, especially on the thin-walled open and closed section. This theoretical knowledge is further applied to solve specific tasks. In this thesis, the applicability of using individual methods for real parts is examined.
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Soustava těles s pasivním účinkem s brzdou
Genco, Ondřej ; Hájek, Petr (referee) ; Fuis, Vladimír (advisor)
This thesis deals with the solution of the body system using NNTP static theory model. The introductory part defines the basic magnitudes and concepts, describes the constraints and the types of passive effects. In the practical part, the influence of passive effects on different moving states in the particular system of the towed trolley is determined. Furthermore, two variants of mechanical friction brakes are designed and compared. The numerical values of unknown parameters are determined by solving the system of linear equations in Matlab.
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Dynamic characteristics obtained from solution of simple vocal folds models
Kubíček, Radek ; Švancara, Pavel (referee) ; Hájek, Petr (advisor)
Bachelor’s thesis concerns the biomechanics of voice and its aim is to obtain dynamic characteristics of simple analytical and numerical vocal folds models. Thesis includes main theories of voice production and thorough analysis of the widest used computational models. Essential is an anatomical and physiological introduction including basic pathologies. Behaviour of computational models mentioned in the bibliographic research is demonstrated by the dynamics characteristics gained by modal analysis and by the solid mechanics equation solution. Eigenfrequencies come under range from literature. The aim of thesis is comparison of analytical and numerical solution and particular computational models.
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Mechanical analysis of lifting equipment
Kubík, Matej ; Hájek, Petr (referee) ; Fuis, Vladimír (advisor)
The aim of this bachelor’s thensis is a mechanical analysis of the lifting device with regard to the passive effects in the bonds. At the same time, it should serve as a additional teaching materialfor students of statics and dynamics. The first part of the work is therefore dedicated to a brief overview of lifting devices, but especially the basic concepts of statics and dynamics. The work then deals with the calculation of the driving torque (force pair) and analysis of the results for the various situations of the lifting device that may occur.
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