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Original title in Czech: Inženýrská mechanikaFSIAbbreviation: D-IMEAcad. year: 2010/2011
Programme: Applied Sciences in Engineering
Length of Study: 4 years
Accredited from: Accredited until: 1.3.2012
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 function of human hearing organ is generally described as moving mechanical system. Actual computer systems enable to perform the computer simulation of the sound signal transmission from external air medium to fluid medium in the inner ear with the consideration of all fluid-structure interactions, the FEM or BEM are most frequently used for this purpose. The complete FE model of normal human ear has been developed at UMTMB. The principal aims of this work will be the amelioration of this FE ear model and the application of this model for sound transfer characteristics calculations when different types of earphones are inserted. The results will be compared with audiological investigations.
Tutor: Pellant Karel, doc. RNDr., CSc.
The objective of the assignment will be to obtain new findings concerning transfer phenomena during crystallization and cooling of concast significantly rectangular-profile steel slabs inside a caster. It will be necessary to establish a dynamic model of the transient temperature field that will analyse the process and in real time, or even shorter. This model will contain a program for scanning all real operational parameters. On the interface of this program, the calculation of the temperature field of the slab will be confronted with the operational parameters that are measured on-line. After determining the limit values of the decisive output parameters, a system will be set up for the control of the caster depending on the current state and recommended limit values. The model is to be integrated into the information system of the concasting technology at VÍTKOVICE STEEL, a.s.
Tutor: Kavička František, prof. Ing., CSc.
The aim of the thesis is the development of articulated splint enabling active assisted motion for the patients post intra-articular fractures. For those patients it is impossible to keep the required motion range in the joint when only passive joint limbering-up is used without connection to muscular activity. The essence of the theme is to develop sensor-mechanic, drive, control and interactive subsystems, that observe active motion using sensors and use such data to control the range and speed of the motion in intelligent way. The participation in the Grant Agency of the Czech Republic project is expected.
Tutor: Krejsa Jiří, doc. Ing., Ph.D.
Tinnitus is unpleasant and annoying phenomena, which can be characterized as roar or whistling in the ears. The goal of the study will be to define this undesirable phenomena and to model it by means of FE modelling.
Tutor: Mišun Vojtěch, doc. Ing., CSc.
The use of FME is possible for the studies of sound transmission via human ear. When the mechanicle conection between eardrum and inner ear is interrupted, the ossicle chain prosthesis are applied. The analysis of the influence of fixation plosition, mode of fixation and mechanical properties of prosthesis on sound transmission characteristics of reconstructed ear will be discussed. http://www.wadalab.mech.tohoku.ac.jp/FEM_mid-e.html ; http://ctl.augie.edu/perry/ear/hearmech.htm http://emedicine.medscape.com/article/836360-overview
1.Detailed background research about noise of computers and how it varies with operating conditions 2. Development of 3D FE model of standard computer type 3. Calculation of internal acoustic field and radiated noise 4. Specification of the efficient noise control arrangement in computers- optimal localization of noise sources, optimal localization of coolling vents and optimal structure of internal sound isolation layers http://www.root.cz/serialy/pocitac-bezici-vetrajici-spici/ http://www.pctuning.cz/
Goal of this dissertation is to find an influence of simple parts of rotating electrical machines on modal property of whole machine. The work will deal with influence of stator core stiffness on modal properties of whole stator part. Significant part of the work will attend to non-linear phenomena's which occur in rotating electrical machines (it is mainly non-linear unbalanced magnetic pull, non-linear bearings and etc.).
Tutor: Dušek Daniel, Ing., Ph.D.
a. Design of the new type of hydrodynamic damper. b. Computational analysis of the dynamic behavior using FLUENT and ANSYS c. Experimental identification of the dynamic behavior the damper with rheological oil. d. Experimental verification dynamic behavior of the rotor dynamics system with damper.
Tutor: Malenovský Eduard, prof. Ing., DrSc.
a. Design of the new type of thrust bearings. b. Computational analysis of the dynamic behavior using FLUENT and ANSYS c. Experimental identification of the dynamic behavior. d. Experimental verification dynamic behavior of the rotor dynamics system with bearings.
Movement optimization of t mobile robots aroud obstacles with AI.
Tutor: Ošmera Pavel, prof. Ing., CSc.
The advanced polymer structures contain material interfaces, which can influence its final lifetime. Important topic of the research is than study changes of the crack behaviour due to material nonhomogeneity. Therefore, general goal of the project lies in the development and suggestion of reliable techniques for estimation of a residual life time of multilayer polymeric structures. Slow crack growth, which can be described by the corresponding fracture mechanics parameters, plays an important part in this estimation. In the case of viscoelastic polymer materials the current methodology will be developed. The correlation between the experimental data and results of relevant numerical model will be presented. The results enable to estimate material's composition with respect to the optimal mechanical properties of multilayer structure.
Tutor: Hutař Pavel, prof. Ing., Ph.D.
The work will be focused on research and development of nonlinear control algoriths which use the dynamical model of the system. The simulation modelling in Matlab+ environment is supposed to use as well as experimental work with Real-Time Rapid Prototyping hardware dSPACE, which is currently de facto standard in automotive industry. Teoretické výsledky budou prakticky ověřeny na konkrétním reálném zařízení.
Tutor: Grepl Robert, doc. Ing., Ph.D.
This theme is focused on the methodology of the experiments and their evaluation. Accuracy of the numerical models based on FEM applied in high thermo mechanic loading is limited by an exact description of the thermal loading. In-line processing of steel profiles, cooling, and direct reduction at continuous casting of steel or hot rolling are such processes. The goal of the theme is a development of such methodologies enabling to obtain boundary conditions from very fast tests at steel deformation and cooling. Laboratory stands used for obtaining reliable and repeatable information about examined process are complex mechatronic systems. The whole series starting with a design of an experiment and ending with its evaluation by an inverse task must be optimised. The proposed theme follows up the EU project supported by Research Found for Coal and Steel Program. Student is expected to take part in a half-year stay in the UK.
Tutor: Raudenský Miroslav, prof. Ing., CSc.
The problems of mechanics of hyperelastic materials are motivated by the possibility of computational assessment of reliability of tyres. The objective is to increase the level of computational modelling of stress-strain states and failures in steel-rubber composites. As no generally acceptable failure criterion has been fomulated till now, not only for elastomers, the first step is the verification of suitable constitutive models, then the description of failures of elastomers; the failure mechanisms depends on the type of the stress state. A criterion of failure of elastomers under statical load proposed by the supervisors recently requires a comprehensive experimental-computational modelling to be verified or falsified. To achieve this, enlargement of knowledge on material characteristics of components of these gradient materials is necessary.
Tutor: Burša Jiří, prof. Ing., Ph.D.
Advanced structures are often created by composite materials with interfaces, which can influence their service lifetime. As an example can be introduced e.g. multilayered polymer composites applied as water or gas pressure pipes or layered ceramics. The aim of thesis is determination of interface influence in layered materials on their failure conditions, crack propagation and eventually residual fatigue lifetime. PhD student will contribute to develop of suitable procedure for determination of interface influence on lifetime of composites. For necessary numerical calculations FEM system Ansys and mathematical software Matlab will be used.
Tutor: Náhlík Luboš, prof. Ing., Ph.D.
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The aim is to develop the methods of continuous heat treatment of hot rolled materials to reach specified structure and mechanical characteristics. This theme demands a considerable scope of the study of mathematical methods, as well as experimental work applied in thermo mechanics. This interdisciplinary theme is focused on the theory of experiment, measuring methods, scanning and recording of parameters and technological process controlling. The Heat Transfer and Fluid Flow Laboratory supports the problem solution with its laboratory facilities. The study is linked with the research projects related to spray cooling. The participation in the Grant Agency of the Czech Republic/GAČR projects, which are oriented to the experimental research of hot processes, is also expected.
The work will be focused on research and development of algorithms for thermal phenomena description of air electronic unit. The aim will be development software for modelling of thermal transient state and simulation a operating and disrepair states. Theoretical results will be practically verified on real electronic units.
Tutor: Vlach Radek, doc. Ing., Ph.D.
The objective of the assignment will be to obtain new findings concerning transfer phenomena during crystallization and cooling of concast massive steel billets and rounds inside a caster. It will be necessary to establish an off-line and on-line model of the transient temperature field that will analyse the process and - in the case of the on-line model - in real time. The models will be corrected and verified via experimental measurement directly in the operation. The model is to be implemented for the optimization of the concasting technology at TŘINECKÉ ŽELEZÁRNY, a.s.
The work will be focused on research and development of state and parameter estimation of dynamic holonomic model in real-time. Application area includes e.g. traction stability systems. The simulation modelling in Matlab+ environment is supposed to use as well as experimental work with Real-Time Rapid Prototyping hardware dSPACE, which is currently de facto standard in automotive industry. Designed simulation models will be based on both holonomic as well as nonholonomic kinematics. Theoretical results will be practically verified on particular real model of four wheeled vehicle.
Tutor: Florian Zdeněk, doc. Ing., CSc.
Microlaminate systems are an attractive class of microstructures for engineered materials due to the natural tendency of some materials to form laminate structures and since multilayer structural toughening is an effective toughening mechanism. Microlaminate structures are utilized to in many electronic and structural applications such as MEMS. The objective of the thesis is to develop a computational model of crack propagation through microlayers. A particular attention will be devoted to the analysis of the transition of crack across the sharp material interfaces. Moreover, high residual stresses developed in individual layers will be taken into account. In case of smooth transitions, Betti's-Rayleigh reciprocal theorem in conjunction with FEM will be employed for the calculation of both, the stress intensity factors and the T-stress. A novel approach will be based upon non-equilibrium auxiliary stress field which implies retaining a domain term in Betti's-Rayleigh reciprocal theorem. Theoretical predictions will be compared with experimental data obtained by Brittle Fracture Group, Institute of Physics of Materials ASCR. It is also expected that the results of molecular dynamics simulations of interface performed at the Lund University will be employed.
Tutor: Kotoul Michal, prof. RNDr., DrSc.
Thermo mechanical degradation of steel surfaces at high temperatures A cyclic thermo-mechanical load of steel surface causes a formation of cracks in the surface layer, and also makes an abrasive worn resulting in a degradation of material structure. A typical example is a surface layer loading of a roll in hot rolling. The goal of the theme is to find a portion of each part of the load on the wear; numerical modelling and laboratory and industrial experiments will be used as the tools expecting to solve the problem of the wear minimizing. Methods for an estimation of the wear should be developed for given load and type of material. A laboratory test bench developed at the Heat Transfer and Fluid Flow Laboratory will be used for the experiments; and FEM package Ansys is expected for modelling within the research. The proposed theme follows up the EU project supported by Research Found for Coal and Steel Program. Student is expected to take part in a half-year stay in the Netherlands and France.
The cochlea serves to transformation of acoustics perceptions into electrical signals that are delivered further into the brain. The goal of the study will be the computer modelling of the cochlea structure so that the model will ensure the transformation of acoustic perceptions into the vibrations of the basilar membrane. There will be used the principle of acoustic waves travelling along the basilar membrane.
Study plan wasn't generated yet for this year.