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Original title in Czech: Inženýrská mechanikaFSIAbbreviation: D-IMEAcad. year: 2018/2019
Programme: Applied Sciences in Engineering
Length of Study: 4 years
Accredited from: 1.1.1999Accredited until: 31.12.2020
Profile
The Ph.D. study focuses on the following fields of mechanics: · Mechanics of solids. Theory of modelling mechanical systems, constitutive material relations with emphasis on non-linear behaviour, limit state conditions of materials and structures, mechanics of composites, biomechanics, analysis of stress, deformation and dynamic behaviour of selected groups of bodies (including composite bodies), inverse problems of mechanics of rigid bodies, modelling of stress and deformation in selected technological processes (forming), theory of experiments in interactive driving and mechatronic systems, dynamic of vehicles and of machinery, solution of selected problems in vibroacoustics. · Mechanics of liquides and gases. Flow theory of compressible and incompressible fluids. Flow of gases and vapours. Nonstacionary flow and impact. Orientation on the flow in hydralic machines and heat engines. · Thermomechanics. Theory of heat and substance transfer. Application of interferometry and other modern experimental methods. Thermodynamic problems of metallurgy and foundry technologies and heat treatment. Applications in the field of design of thermal power-generating machines. Inverse problems of heat transfer.
Guarantor
prof. Ing. Jiří Burša, Ph.D.
Issued topics of Doctoral Study Program
The thesis will deal with research in the field of control and identification of nonlinear dynamic systems using methods based on the idea of local linear models (Lazy Learning, LWR, RFWR). The identificated inverse dynamic model will be used as a feedforward compensator in the structure of a composite regulator. The results of the research will be verified experimentally with real systems available in the Mechatronics laboratory (education models, automotive actuators, etc.) using the Matlab/Simulink computational environment and available hardware resources. Implementation in the form of an electronic control unit with a microcontroller is expected.
Tutor: Grepl Robert, doc. Ing., Ph.D.
This is an actual biomechanical topic, included in the solved project of Czešch Science Foundation. Assessment of vulnerability (rupture risk) of an atherosklerotic plaque in carotid artery as one oc common causes of brain stroke is an issue with a significant scientific and clinical potential. The objective of this specific topic is to complete the stress-strain analyses with the impact of blood flow (as a non-Newtonean liquid) in a compliant blood vessel on its stress strain states.
Tutor: Burša Jiří, prof. Ing., Ph.D.
This is an actual biomechanical topic, included in the solved project of Czech Science Foundation. Structure-based anisotropic constitutive models are used nowadays for description of mechanical behaviour of arterial wall tissues. These models are capable to include the dispersion of directions and waviness of collagen fibres in the tissue. However, their application is limited by a lack of relevant structural information. The aim of the topic is to continue development of the automated methods for structural analysis of arterial tissues and to exploit them in acquiring input data for relevant constitutive models of pathological arterial wall.
The work will be focused on research and development of computational modeling of special electric machines. The aim will be development of procedure for complex modeling of dynamic temperature states of elektric machines. Theoretical results will be practically verified on real machines.
Tutor: Vlach Radek, doc. Ing., Ph.D.
Principle of nanoindetation is pushing a tiny tip into the material at the level nm - the output of the experiment is the dependence of the force-displacement tip. In the first phase, the objective is to determine the material characteristics so as to ensure consistency between experimental and computational (finite element method) determine the dependence of the force-displacement tip. For a running calculation model will be in the next phase of computational modeling process nanoindetation for bodies with different material properties.
Tutor: Fuis Vladimír, doc. Ing., Ph.D.
Vocal folds posturing to phonation position is a fundamental aspect of human voice production control. A detailed study of this mechanism is important for understanding of voice production in healthy individuals and particularly patients with voice disorders. Aim of the work is to create three-dimensional finite element model of laryngeal cartilages and soft tissue of the vocal folds for analysis of the motion and stress of vocal folds during setting to phonation position. Movement of the laryngeal cartilages will be activated by the action of the muscles of the larynx. Created computational models will be used for stress-strain analyses of pathological changes of the vocal folds such as unilateral vocal fold paresis.
Tutor: Švancara Pavel, Ing., Ph.D.
Human voice production is based on interaction between by air flow excited oscillations of the vocal folds and acoustic processes in the vocal tract. A detailed study of this mechanism is important for understanding of voice production in healthy individuals and particularly patients with voice disorders. The aim is to create finite element model of interaction between self-excited oscillation of the vocal folds and acoustic spaces of the vocal tract. After verification of the model results by comparison with experimental data, on this model further analyze the influence of some pathological changes in the tissue of the vocal folds (Rinke's edema, Sulcus vocalis etc.) on the vocal folds oscillations and produced voice.
At present, there is an effort to increase the specific power of machines, so speed of their rotors is still growing. For this reason, it is necessary to use pivoted-pad journal bearings due to the high stability of the lubricating film. Stable lubrication film allows rotors to operate at higher speeds and in situations where the ratio of bearing width to bearing diameter would not be satisfactory for other bearing types. The advantage of properly designed pivoted-pad bearings is a very good resistance to an instability of lubrication film and associated rotor instability. To design a proper pivoted-pad journal bearing for a given application, static and dynamic characteristics of the bearing should be known. The aim of the thesis is to create algorithm for calculation of static and dynamic characteristics of pivoted-pad journal bearing. In practical applications, nonstandard bearing geometry requirements such as many tilting pads placed around the circumference of the journal must be met. The contribution of this thesis should be the creation of the algorithm that meets such non-standard requirements with respect to the number of tilting pads and a stiffness of their support. For practical applicability, it is also necessary to focus on the high accuracy combined with an acceptable time of calculation.
Tutor: Návrat Tomáš, doc. Ing., Ph.D.
Interdisciplinary research focused on experimental work, methods of measurement, data recording and evaluation. The aim is to design, develop and optimize sensors and subsequently to develop numerical methods for processing of the data obtained from sensors.
Tutor: Kotrbáček Petr, doc. Ing., Ph.D.
The topic of work raises from requirement on the reliable description of materials used in the power engineering, especially in the nuclear industry. Recently, the emphasis is placed on the development of new technologies for sustainable source of energy. On the basis of this requirement, the fusion reactor is being developed, in which there are high demands on the constructional materials. The aim of this work is formulation of reliable approach to description of ductile fracture of reactor steel, and even at elevated temperatures, which the material is exposed to, apart from the radioactive radiation. The work combines the design of suitable experiments and their assessment with subsequent development of numerical model for reliable description of steel behavior.
Tutor: Petruška Jindřich, prof. Ing., CSc.
The topic is a continuation of a long-time research in the area of ductile fracture simulation under large plastic deformation and monotonic loading. Actual results will be applied to ductile damage under extremely low cycle fatigue, up to 100 cycles. Successful models of ductile damage will be coupled with cyclic plasticity and suitable damage cumulation model, including their calibration. All the models will be tested on real materials and their predictive capacity will be assessed.
Application of poweful microcontrollers allows implementation of advanced supplementary functions. One of an important areas of recent development are algorithms for detection, isolation and management of faults in mechatronic systems. This work will deal with the development of new algorithms based on local linear models and soft computing methods. Theoretical and simulation results will be verified on real systems available at Mechatronics laboratory (edu models, automotive actuators etc.). The modelling in Matlab+ is expected as well as the experimental use of Real-Time Rapid Prototyping dSPACE.
Hollow plastic fibres are used in heat exchangers in past decade. Polypropylene and PVDF capillary are used only recently. Plastic capillary ere flexible and can be easily formed into various shapes. Surface of capillary can be modified and its hydrofobity can be influenced. Heat and mass problems should be studied in this theme. Condensation and evaporation of liquids on inner and outer surfaces of the hollow fibres will be studied.Special cosideration is for bio-fouling applications.
Tutor: Raudenský Miroslav, prof. Ing., CSc.
Smart materials and applications are currently developed for self-monitoring and self-healing airplanes wings and producers aims to use the smart material for wings and fuselage of airplanes. As well smart clothes have a huge potential when it comes to sports and health. Main goal of this PhD study is targeted to a development of as well smart mechanical parts with integrated piezoelectric layers or skins. Piezoelectric layers could be used for sensing and harvesting of both energy and data from a dynamic operation of used components. Developed parts could monitor themselves and provide information for Industry 4.0 applications.
Tutor: Hadaš Zdeněk, doc. Ing., Ph.D.
Failure probabilty of ceramic heads of the total hip joint endoprosthesis is calculated by Weibull weakest link theory. General 3-axis stress rices in the ceramic head under ISO 7206-5 loading and this stress has significant tensile component in the circumferential direction (first principal stress). Previous research included in this calculation model only the tensile stress and the remaining components were not considered. The aim is to extend the computational modeling of head's failure probability of the other two principal stresses.
PhD thesis is multidisciplinary and includes both theoretical solution of SLAM problem for multiagent robotic systems with inter-agent communication and experimental verification using mobile robots with heterogenous sensor equipment. The goal of the thesis is to propose robust method of fusion of sensor data of different principles obtained from different positions and furthermore propose and verify minimal sensoric configuration while ability to determine the position of the robot and build the map of environment is intact.
Tutor: Krejsa Jiří, doc. Ing., Ph.D.
PhD thesis is multidisciplinary and includes both theoretical solution of SLAM problem for multiagent robotic systems without inter-agent communication and experimental verification using mobile robots with heterogenous sensor equipment. The goal of the thesis is to propose robust method of fusion of sensor data of different principles obtained from different positions and furthermore propose and verify minimal sensoric configuration while ability to determine the position of the robot and build the map of environment is intact.
The work will be focused on research and development of computational modeling of special cooling method of electric machines. The aim will be development of procedure for rotor cooling of elektric machines. Theoretical results will be practically verified on real machines.
This is an actual biomechanical topic, included in the solved project of Czešch Science Foundation. Assessment of vulnerability (rupture risk) of an atherosklerotic plaque in carotid artery as one oc common causes of brain stroke is an issue with a significant scientific and clinical potential. Stress strain analyses will exploit patient-specific computational models with geometry reconstructed on the basis of MRI images, mechanical properties from literature as well as from experiments realized in our lab and structural information from our histological analyses.
Improvement of the mechanical properties of the steel is achieved in addition to the different chemical composition by heat treatment. The work will focus on obtaining and analyzing the cooling intensity during the heat treatment of the steel strip after continuous rolling. The student will become familiar with the calculation of heat conduction in rigid bodies, a poor conditional inverse task for calculating boundary conditions from experimentally measured data. In the Heat Transfer and Fluid Flow Laboratory, cooling measurements are performed for various types of sprays (laminar streams, flat and conical water sprays) and for different types of steel surfaces (grinded, rolled, oxidised). From the measured data, temperature-dependent heat transfer coefficients will be calculated using the inverse task, which will be further processed. It is expected that the data received will be strongly dependent on temperature. It is determined whether the dependence of the cooling intensity can be described by means of a mathematical function, an analysis of the influence of different types of sprays and the influence of different surfaces on the cooling. At the same time, the cooling intensity will be studied from residual water remaining after the surface has been sprayed. Generated model should especially serve to optimize the continuous heat treatment of steel.
Tutor: Pohanka Michal, doc. Ing., Ph.D.
During the steel production and hot processing the surface of steel is exposed to an oxidizing atmosphere and surface oxide layer (called scales) is formed. These scales are removed using high-pressure flat jet nozzles. During this process surface quality (amount of remaining scales) is monitored and the amount of heat dissipated from the steel is measured. The quality of the surface depends not only on the configuration of the hydraulic spray, but also on the quality of steel (chemical composition), thermal treatment and coating. Water spray causes a sharp drop in temperature and thus significant change of material properties of scales. Moreover, they are usually not formed by homogeneous layer. It is a layer composed of several types of scales: wüstit, magnetite and hematite; whereby their ratio depends on the oxidation temperature. Oxide scales are usually porous, which allows water to penetrate into the cracks which may lead to steam explosion due to very high temperatures (above 1000°C) of scales. Hydraulic descaling is very complicated process, which consists of the mechanical effect of the water jet, thermal contraction of the surface layers, shear stresses at the interface of scales / steel, bending of scales due to temperature gradient and steam explosions in the cracks. The aim is to create theory and verification model of hydraulic descaling and describe the principles in this combined thermo-mechanical stresses. Computational model based on the theory will be used for verification of developed theory. Results from the model will be compared with results obtained from real descaling measurements in laboratory. Model should serve also for optimization of the hydraulic descaling for hard to descale materials (e.g. steel with increased content of silicon for the automotive industry).
The strategy of automobile manufacturers is increase of the light source output while outer dimensions stays same or reduce. This leads to higher demands on the thermal management from the light source to outside of the lamp body. Temperature distribution and other physical important quantities in the operating conditions will be experimentally found in specific cases. The numerical simulation will follow to provide the optimal improve of the lifetime and reliability of the used light source.
Study plan wasn't generated yet for this year.