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Dissertations / Theses on the topic 'Pruty'

Author: Grafiati

Published: 28 June 2021

Last updated: 1 February 2022

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1

Röder, Václav. "Ocelobetonové tlačené pruty z materiálů vysokých pevností." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-234537.

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The main objective of this thesis is the verification of the buckling strength of the composite compression members which were made from high-strength materials. This thesis is divided into four main chapters which are interconnected. The first chapter summarizes the current state of the problem of the compression members. The basis of this part is the elementary theories and researches, the task of this text is attempted to understand and obtain normative procedures which are important for practical use. The second part deals with the theoretical analysis of composite column, mainly with the examination of the individual effects on the buckling strength. The result of the first and the second parts is analytical algebraic equations which determine the buckling strength of the member. The third part contains the numerical analysis, which leads to create a numerical model of the compression column. The numerical model is used for the verification of the theoretical analysis and for the investigation of the behaviour of the column loaded by axial force. The last part deals with the experimental verification of the previous analyses. There are tested various types of the composite columns, which were made of steel with a yield strength up to 455 MPa and of the concrete with a cube compression strength up to 102 MPa. Experimental results confirmed the high reliability of centrally loaded column and every tested columns failed by flexural buckling. The final step is evaluation and comparison of the results obtained from previous four parts. It was founded that design criteria for centrally loaded steel-concrete column are too conservative and design relationships doesn´t use the positive properties of high-strength materials for economic design.

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2

Nosek, Jakub. "Analýza teplotního chování procesu aditivní výroby mikro-prutových struktur z materiálu AlSi10Mg." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443192.

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Using Additive manufacturing it is possible to manufacture complicated components, that cannot be manufactured using conventional methods. The typical example is the lattice structure. Fabrication of these structures is complicated, and it is different from the fabrication of bulk parts. Using numerical simulation which can reflect process parameters it is possible to analyze the thermal behaviour of vertical and inclined struts fabrication. Results show that the diameter of struts influences weld track width. This influence is caused by preheating the powder material by previous scanning paths. The final geometry of inclined struts is made in more scanning layers. In this work influence of the start and endpoint of trajectory is described.

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3

Křivohlavý, Petr. "Aditivní výroba prostorových prutů z polymerních materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442803.

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This thesis is focused on creating polymer lattice struts without any necessary support in full length using robotic 3D printing. The aim of the thesis is to find suitable process parameters and printing strategies with respect to the accuracy of the polymer struts. A statistical model of effects of individual process parameters has been produced to achieve stated objectives. The model enables finding optimal process parameters. The printing strategies for thus established process parameters are tested to increase the accuracy of the finished print and the quality of the bonds between individual struts. The accuracy assessment is executed using optical 3D metrology. The maximum deviation from the nominal shape 0.54mm has been accomplished using discovered process parameters and printing strategies.

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4

Pešek, Ondřej. "Stabilitní problémy prutů z vrstveného konstrukčního skla." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390277.

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Transparent and subtle structures are features of modern architecture. Structural glass is constructional material that provides to realize architect's visions and ideas. Glass as a constructional material is more often used as a material for primary load-bearing structures. Realization of safe, reliable and economic glass structure is real challenge for structural engineers because of absence of standards for designing of glass members and elements. Compressed members (columns), bended members (beams) and members loaded by compression and bending (beam-columns) were analysed in the frame of the doctoral thesis whereby the emphasis is being placed on the lack of stability – flexural buckling, lateral-torsional buckling and flexural-lateral-torsional buckling. Measuring of shape and amplitude of initial geometrical imperfections is a part of doctoral thesis. The theoretical analysis describes the behaviour of the member by means of solving the differential equations. The solution according to the second order theory developed for metal members is applied on structural laminated glass members with use of effective cross-sectional characteristics. Numerical analysis is focused on the use of commonly available software based on finite element method in order to predict the load-bearing resistance of laminated glass members. Actual behaviour of laminated and monolithic structural glass members was found within experimental program. The correctness of FEM model and analytical solutions were evaluated by comparing with test results. The goal of the doctoral thesis was determine of buckling curves for calculation of flexural buckling and lateral-torsional buckling resistances by the same calculation procedure as for metal members. Because of small number of experimentally tested specimens the Monte Carlo simulation was performed.

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5

Vild, Martin. "Zesilování ocelových prutů namáhaných osovou silou pod zatížením." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390269.

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Dissertation focuses on strengthening of axially loaded steel members strengthened under load. Strengthening under load using welding is time and financially efficient. Plastic design can be used for members without stability problems. However, the design of members susceptible to buckling is difficult and opinions of researchers differ on this matter and there are only several experiments. The dissertation is focused on strengthening under load of members with selected cross-sections susceptible to flexural buckling. It is necessary to check the resistance of the base member weakened by the elevated temperatures caused by welding. The preload and welding – residual stress and deformations – must be taken into account for the determination of the buckling resistance of the member strengthened under load. The aim of this dissertation is to provide the load resistance of selected compressed members strengthened under load. Author performed experiments on members with the H and L shaped cross-sections and seamless tubes. Other experiments were performed on members with H shaped cross-section and rectangular hollow sections to determine the resistance of base member during welding. These served to validate numerical models which helped to increase the number of specimens for statistical evaluation. Analytical models to determine the load resistances of the base member during welding and the strengthened member were developed using experiments from literature and author’s experiments and numerical models. The simplified model is conservative and suitable for practical design. The complex model is suitable for scientific purpose and it provides both deformation and load resistance using modified imperfection factor. It provides a good agreement with the experiments. Doctoral thesis also includes practical recommendations for design and execution of strengthening under load using welding.

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6

Petrík, Tomáš. "Pavilon šelem v zoologické zahradě Lešná." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226062.

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The subject of the diploma thesis is a processed design of a steel construction of a pavilion shaped by spherical segments. The pavilion has exhibition purpose as a part of the zoological garden Lešná, and is intended for African beasts. The design meets architectonical requests - roundness and luminosity. A shape of the pavilion consists of three intersecting cupolas with a frontal curved cut out for glass facade. Construction of the pavilion consists of the radial arranged arched ribs with transversal bars, which are supplemented by horizontal purlins. Forehead of the pavilion is formed by columns and girts. Cladding is designed in combination: aluminum profile and insulated glass. Comparison of alternative steel structure solutions is also a part of the diploma thesis.

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7

Gulve, Nitish [Verfasser], Thomas [Gutachter] Rudel, Joerg [Gutachter] Wischhusen, and Bhupesh [Gutachter] Prusty. "Subversion of Host Genome Integrity by Human Herpesvirus 6 and Chlamydia trachomatis / Nitish Gulve ; Gutachter: Thomas Rudel, Joerg Wischhusen, Bhupesh Prusty." Würzburg : Universität Würzburg, 2019. http://d-nb.info/1176411152/34.

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8

Baxant, Radek. "Řešení stability prutových konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227507.

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This diploma thesis deals with the subject of slenderness bars’ stability assessment, especially in the steel structures. Before the assessment of bars in the frame constructions, we search for the influence of the computational model’s settings on the final result. The initial geometrical imperfections are examined on the model of Euler’s bar. The influence of the rigidity of girders on the poles’ buckling length is examined on the basic frame construction. The buckling lengths are assessed in the comparison with the figures we got from the statistical tables and the computational software. The influence of construction’s initial tilt and its replacement by the system of outer forces is examined on the frame structure. Three-hinged frame structure with variable cross-section member is designed then and the influence of non-linear calculations on the inner forces is studied. In the complex frame assessment, the influence of the number of parts of variable cross-section member on the bars’ buckling length is examined.

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9

Nezbedová, Anna. "Problematika spolehlivosti ocelových prutových prvků citlivých na imperfekce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227705.

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This thesis deals with the problems of reliability of steel members sensitive to imperfections. Formulas for nonlinear analysis of compressed and bended members are derived. For compressed elements, there is described the issue of buckling, for bended elements it is lateral-torsional buckling. Then a statistical analysis of reliability of these problems is performed and also comparison with the approach described in Eurocode 3.

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10

Mazáč, Petr. "Koncepční návrh ultra lehké konstrukce lunárního habitatu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230821.

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This master’s thesis deals with ultra lightweight structural design concept of a lunar habitat. The beginning of the thesis is focused on basic properties of the Moon and different concept designs of lunar habitats and bases. Afterwards the main concept is introduced with defined loads followed by application of loads on the construction and design of main parts of the construction, especially design of an inflatable beam. Thesis is ended by manufacturing technology of an inflatable beam and design concept of main structural nodes.

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11

Zeizinger, Lukáš. "Předávací most kolesového rypadla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241840.

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The document deals inspecting forces of the structure. The task of diploma thesis is analyze the crane load and chech up the stress of steel construction. Perform stress analysis forwarding bridge of bucket-wheel excavator by using finite element method. Further assess the consequences resulting from the design modifications. The project was carried out with cooperation with NOEN, a.s.

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12

Hanzelka, Jan. "Posouzení únosnosti rámu kočky mostového licího jeřábu o nosnosti 120/40t - 21m." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229660.

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This diploma thesis deals with a steel construction of crab frame of ladle crane with lifting capacity of 120 and 40 tons and maximum lifting height of 21 meters. The aim of the work is analysis and assessment of the support frame of crane with a load of fatigue according to ČSN 27 0103/89. For this analysis is used thin shell and beam model. The diploma thesis was developed in cooperation with the Královopolska a.s. company.

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13

Šedrla, Jakub. "Most na dálnici nad Dolanským potokem." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226425.

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My thesis is focused on a design and comparism of the highway bridge across Dolansky creek. The bridge is built by balanced cantilever method. The common span length is 110metres. The bridge is post-tensioned concrete structure.The static model is made of beams.The static analysis during lifespan of bridge is made by Time discretization analysis . The design of reinforcement is made for longitudinal section and cross section.

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14

Machů, Zdeněk. "Výpočtové modelování piezoelektrických vrstevnatých kompozitů a analýza jejich elektro-mechanické odezvy při harmonickém kmitání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400492.

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V současnosti je velmi aktuálním tématem generování elektrické energie z alternativních zdrojů, zejména z vibrací. Zařízení, která přeměňují mechanickou energii na elektrickou, využívají často ke své činnosti piezoelektrický jev. Pro optimální nastavení takového elektromechanického měniče pro danou aplikaci je třeba mít k dispozici výpočtový model, který bude schopný postihnout všechny klíčové aspekty jeho provozu. Tato práce se tedy zabývá vytvořením takovéhoto nástroje, který je schopen komplexně popsat elektromechanickou odezvu studovaného piezoelektrického měniče energie v podobě vetknutého, vícevrstvého keramického nosníku s piezoelektrickými vrstvami. Uvažovaná vícevrstvá konstrukce je během své činnosti vystavena kinematickému buzení a je rovněž zatížena tepelnou zbytkovou napjatostí vznikající při její výrobě. Vytvořený výpočtový model využívá klasickou laminátovou teorii k určení statické elektromechanické odezvy dané konstrukce. Elektromechanická odezva při kmitání uvažované konstrukce v ustáleném stavu je získána s využitím Hamiltonova variačního principu a teorie kmitání prutů. Vytvořený výpočtový model je dále schopen odhadnout zdánlivou lomovou houževnatost dané vícevrstvé konstrukce pomocí metody váhových funkcí. Výstupy vytvořeného výpočtového modelu jsou ověřeny s využitím numerických simulací na bázi MKP a dostupných experimentálních výsledků. V diplomové práci je následně vytvořený výpočtový model aplikován při hledání optimálního rozložení jednotlivých vrstev konkrétního vícevrstvého nosníku s cílem maximalizovat jeho elektrický výkon a odolnost vůči šíření povrchových trhlin, resp. vzniku křehkého lomu. Tohoto cíle je dosaženo pomocí vhodného rozložení tepelných zbytkových napětí v jednotlivých vrstvách uvažované konstrukce (řízeného použitými materiály a tloušťkami jednotlivých vrstev).

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15

Žák, Ondřej. "Obchodní galerie." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226649.

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Master's thesis addresses the design and assessment of the load bearing structure of the shopping gallery. The building is designed as a three-storey rectangular plan with a flat roof. The structure is composed of steel frames and composite steel and concrete slabs. There are proposed two possible solutions - variant with a flat roof and direct central gallery, a reinforced rigid steel frames and a variant with a cupola roofed circular inner atrium, solidified with rods.

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16

Grebeň, Petr. "Výpočet průhybu součástí při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228344.

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Selected chapters of the science branch "Elasticity and strength" applied to manufacturing of thin parts with various solution approaches. Applying theory of bars and a non-linear differential equation for the deflection line of the second order to a machined shaft. Numerical calculation in the ANSYS program. Evaluation and design of solution variants to machine thin shaft parts without supporting them.

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17

Vondráček, Vít. "Nosná konstrukce atypického rodinného domu ve Vrchlabí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240297.

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The subject of master’s thesis is design and assessment of steel load-bearing construction of atypical family house in Vrchlabí. Structure is designed as multi-storey steel structure, cooperating with stiff concrete core. The design was considered in four different options which combines possibility of using steel, steel and timber with different way of stiffness for whole structure. There is also composite steel-concrete alternative floor trimmer for selected option. Design and assessment was conducted in accordance with the applicable standards and by using software Scia Engineer.

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18

Shánělová, Lenka. "Výstavní pavilon." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226635.

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The Master´s thesis contains design of steel construction of exhibition pavilion, which is consists of columns, dome, lantern and suspension footbridge. Building will be intended for organizing exhibitions and conferences by town Trutnov. Two models of variants of dome´s construction are drafted in this work– Schwedler´s and Föpple´s dome. Models are space tubular structures.The work contains static assessment of spatial structures and spherical steel joint in program SCIA Engineer for both variants. Hand assessment of bars, basic details and anchoring, technical report and drawing dokumentation are drafted for selected variant construction with Schwedler´s dome.

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19

Dojava, Marian. "Detekce jízdních pruhů a překážek." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219062.

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This master´s thesis deals with depiction aplication of camera like sensitive element for assisting system of car. It was proposed, how find a road, a lane and a obstacle on roadways. Only one camera was aplication for it. Solution is realized by methods, that are based on color and gradient of image. It applies simple methods and methods with mathematical model. Result is sum of method and its test and comparing. Realization of my program is present at resume of this thesis.

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20

Prusty, Manamohan [Verfasser]. "Directed chaos in magnetic billiard systems / vorgelegt von Manamohan Prusty." 2007. http://d-nb.info/983572372/34.

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21

Murmu, Reena Priti [Verfasser]. "Refinement of neuronal networks in the rodent prefrontal cortex and hippocampus: critical impact of early and late social experiences / von Reena Prity Murmu." 2008. http://d-nb.info/988206161/34.

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22

Blahutová, Jitka. "Diagnostika a terapie úchopu s cílem nácviku grafomotoriky u dětí z pohledu ergoterapeuta. Podtitul: Možnosti využití speciálně vyvinuté grafomotorické pomůcky v testování tužkového úchopu u dětí předškolního věku." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-351411.

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The main topic of my diploma thesis is the diagnosis and the therapy of handwriting training of hand grasp in preschool children. This diploma thesis describes and evaluates possibilities of using a handwriting tool, which was developed in cooperation with Centre for Biomedical Engineering and 1. Faculty of Medicine, for hand grasp testing. A handwriting tool measures fingers grip pinch while the fingers are used in hand grasp. The theoretic part comprehend useful findings about handwriting, its development. In detail it is focused on diagnosis and therapy of hand grasp, which is an important aspect in handwriting development. This theoretic part also includes description of handwriting disabilites in preschool children and description handwriting tools, which are used for correct hand grasp training. The conclusion of the theoretic part is focused on therapy of hand grasp and handwriting training from the ergotherapist point of view. The goal of the practical part is to find out fingers pinch in hand grasp in normal healthy preschool children using a specialy developed handwriting tool and to recommend another possibilites of using this new tool in handwriting training.

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