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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
661

Deformačně-napěťová analýza povrchové náhrady kyčelního kloubu / Strain-stress analysis of the surface replacement of the hip joint

Vosynek, Petr January 2008 (has links)
Today is the surface hip repacement very often surgery becouse of new studies and improvements. For young and active people it's the best way to delay implantation of a total hip replacement. The objective of this study was to perform finite-element analyses of computational model of the partial/total surface replacement, conventional partial/total replacement and physiological hip joint. We obtained strain-stress states from these analyses. All results were compared one another and then were confronted with results of the physiological hip joint. The three-dimensional computational model consists of these components: sacral, pelvic and femoral bone, muscles, artificial socket, and surface hip replacement. We were using FEM system ANSYS. The geometrical models of bones were generated by means of computed tomography (CT) images. The FE model of bone reflects two types of the bone tissues (trabecular and cortical bone) and muscles which are important when standing on one leg. The model of the muscle corresponds to isometric contraction. The implants material and bone tissues were modelled as isotropic linear elastic material. The model was loaded by force, corresponding to load by standing on one leg.
662

Hnací ústrojí řadového tříválcového vznětového motoru / Cranktrain of In-line Three-cylinder Diesel Engine

Langer, Zdeněk January 2008 (has links)
Increasing requirements on products quality e.g. internal combustion engines, and growing demand on producing major parts lead to the giant development of the engines. With the engine development also great progress in the software tools has come. By decreasing costs on production of the prototypes and by support of the measured data the verification of the computational models is possible. This development has connection with using CAE tools like CAD systems, FEM programs and multi-body systems. The subject of this thesis is about using these systems to solve cranktrain dynamic. Also cranktrain dynamic results are introduced there. Interaction between the engine block and the crankshaft is solved by the hydrodynamic bearing model. All simulation methods are presented on a diesel free-cylinder in-line engine.
663

Čtyřdobý motor pro malý motocykl / 4-stroke Engine for Small Motorcycle

Břečka, Lukáš January 2008 (has links)
This diploma work dissertate of 4-stroke engine for small motorcyle design concept with set points. There is description design concept of single part, analysis of crank mechanism, draft calculations of cran and cam mechanism with solidity calculation of motor piston. Part of this diploma wokr is strain analysis of motor piston with finite element method (FEM).
664

Manipulátor ovocnářských produktů / Manipulator of fruit products

Riesner, Tomáš January 2008 (has links)
The work deals with construction project of manipulator for loading of fruit products to a means of haulage (lorry semi-trailers, railway wagons). One part of the writnig is an idea concept of whole machinery and a detailed project of a lifting part with its strentght calculation. That was firstly worked out manually as a design and then subsequently optimalised by the Finite Element Method. Design documentation was made up based on the construction project and the calculated values.
665

Deformačně napěťová analýza rotorového svazku synchronního generátoru / Stress analysis of rotor packet of synchronic generator

Bureš, Jiří January 2008 (has links)
This diploma thesis deals with distribution stress and strain of sheets metal of rotor packet and in critical locations of supporting bars of synchronous generator. These variants are calculated and one another comparison of analytic calculation results, numeric calculation of 2D model and numeric calculation of 3D model in three vriants ( with bars of rectangle section, circular section, with upper radius). The calculation include influence of thermal expansion, centrifugal force, interference of the packet on the shaft and prestress in the axial direction of bolt. To creation of geometric model and numerical calculation is used program ANSYS 11.
666

Návrh cvičného letounu s tandemovým uspořádáním sedadel / Design of Trainer Aircraft with Tandem Seats

Dycka, Jan January 2008 (has links)
The diploma thesis deals with the project of composite constuction of aeroplane VUT 001 Marabu and its FEM stress-deformation analysis. The project of pilt´s cockpit is solved in the light of basic ergonomic requirements. Mass analysis, calculation and resulting selection of conclusive events of load are parts of the work. The results are applied on FEM model of fuselage and the state of stress in individual sections of composite structure are determined by the MSC Patran/Nastran system.
667

Deformačně-napěťová analýza patologického kyčelního kloubu / Strain-stress analysis of pathological hip joint

Stodola, Martin January 2008 (has links)
This work deals with stress-strain analysis pathological hip joint. In its introduction a research study from accessible literature sources is carried out. It covers contemporary state of scientific studies, anatomy of single components hip joint, their material properties, ways and magnitudes of loadings and most often FE model used. With use of all these informations, computational system ANSYS and gained CT scans, a model of geometry of pelvis and femur is created. Subsequently, the complete computational model o pathological hip point is compiled. On this model computational solution is executed stress-strain and sensitivity analysis. Subsequently, surgery operation is simulated on this model and it is executed stress-strain analysis. These analyses are compared with analysis of physiological hip joint.
668

Nalezení optimální geometrie kryogenní nádoby / Optimum design selection of a cryogenic tank

Létal, Tomáš January 2009 (has links)
The purpose of this work is to find optimal design for mounting cryogenic tank into ISO container frame. Solution is based on stress analyses of several designs and theirs interpretation. According to standards, set of tests, which all cryogenic containers have to pass before being put into operation, is created. Designs are tested by final element method using software ANSYS. At first, results of the stress analyses provide base for improvements targeted to better meeting with needs of the standards. In final stage, the results participate in optimum design selection.
669

Optimalizace pasivních metod snižování hluku počítačů pomocí modelování / Application of modelling for noise control of computers

Nešetřil, Čeněk January 2010 (has links)
The aim of this thesis is to discuss the diffusion of noise inside the personal computer and possibilities of decrease it. The results of this thesis are presented in this work. I used the Ansys FEM program for simulation of the noise diffusion and effectivity of anti-noise equipment.
670

Návrh řešení potrubní sítě procesní jednotky / Design of process unit pipeline

Butek, Petr January 2010 (has links)
The master’s project deals with the pipeline systems of process unit. The design of the industrial pipeline is usually extensive and complex task interwoven with a lot of technical disciplines. Diploma thesis is focused on the strength calculation of the pipeline specified by the ČSN EN standard. The main goal of the calculation is appraisal of the most stressed parts under operating and testing conditions. The diploma thesis is handled with the key aspects that influence the overall concept of the pipeline design as well as the strength calculation.

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