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Design of formula SAE rear axle
Tomášek, Pavel ; Blaťák, Ondřej (referee) ; Porteš, Petr (advisor)
This thesis is concerned with the design of Formula SAE rear axle suspension and spring suspension. First part of the thesis deals with the preliminary desing and is followed by the kinematic analysis and optimalization of the rear axle geometric ordering. Next part is related to the verification of the spring suspension characteristics. Both these parts were worked up with the aid of the software ADAMS. Last part of the thesis includes the engineering desing of rear axle components and stress and deformation analysis.
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Study of the Šternberk bypass on road I / 46
Dibďák, Jan ; Čepil, Jiří (referee) ; Kosňovský, Michal (advisor)
The subject of the bachelor´s thesis is the study of the East bypass of the town Šternberk. The reasons for constructing the bypass are divert heavy traffic, to increase safety in the city and to reduce the traffic negative impacts of transport. Road is designed as a S11,5/90 with slow and declining lines. From five searched variants were chosen one, which was designed in more detailes.
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Lateral Torsional Buckling of Thin-Walled Steel Beams with Web Holes
Horáček, Martin ; Škaloud, Miroslav (referee) ; Juhás,, Pavol (referee) ; Melcher, Jindřich (advisor)
The current trend in the design of steel structures leads, due to the saving of the material, to the frequent use of thin-walled cold formed steel sections. Thin cold-formed steel profiles are often manufactured with web holes. A specific example of thin-walled steel profiles are Sigma beams used in additionally installed built-in floors systems in warehouses. The aim of doctoral thesis is the analysis, assessment and experimental verification of the technical solution of thin-walled steel beams with web openings loaded in bending with respect to lateral torsional buckling. The objective is to develop knowledge about the real properties of steel members of considered structural arrangement in order to specify the methods of analysis and design in industrial practice. The theoretical analysis describes the behavior of the beams by means of solving the differential equations of the equilibrium on deformed element of thin walled member under bending. In case of beams with web holes is used the solution in the form of introduction of substitute cross-section properties, which are defined as the weighted average of the properties of full and weakened section. The numerical analysis is focused on the use of commonly available software in order to predict the bending resistance of beams with web opening with respect to lateral torsional buckling. Since the software used in practice solves only the prismatic beams without option to model the web openings, it is in frame of numerical analysis verified the model of beam with reduced thickness of web constantly over the whole beam length in the zone of perforation. The experimental analysis is firstly focusing on the verification of real bending and torsion stiffness of the beams, based on which are being derived the values of basic cross-sectional properties. Subsequently the experimental verification of real bending resistance with respect to the lateral torsional buckling is being performed.
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Problems of Reliability of Steel Members Sensitive to Imperfections
Nezbedová, Anna ; Lehký, David (referee) ; Kala, Zdeněk (advisor)
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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Sensitivity analysis of stability problems of steel structures
Valeš, Jan ; Vičan,, Josef (referee) ; Kučerová,, Anna (referee) ; Melcher, Jindřich (referee) ; Kala, Zdeněk (advisor)
The doctoral thesis is focused on evaluation of global sensitivity analysis of load-carrying capacity of steel hot-rolled beams. These beams are subjected to lateral-torsional buckling, weak axis buckling and strong axis buckling. Very comprehensive computational models which were both geometrically and materially nonlinear were created in Ansys software using solid finite elements to calculate the load-carrying capacity. The computational models allowed modelling of random initial imperfections such as initial curvature, deviations of cross-section dimensions and steel properties. Sensitivity analysis quantified their influence on the load-carrying capacity. Simulation runs of random imperfections were generated using the Latin Hypercube Sampling method. Since the evaluation of sensitivity analysis of load-carrying capacity of all finite element models would cost an extreme amount of computer time, the thesis aimed at developing a meta-model (also known as surrogate model) based on approximation of FEM model. The approximation polynomial then facilitated the evaluation of sensitivity indices using a high number of simulation runs. At the end, the relationships between the slenderness and the first and second-order sensitivity indices are plotted in graphs. Those random input imperfections that influence the variability of load-carrying capacity the most are pointed out.
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Steel Structure of Footbal Grandstand
Kloss, Tomáš ; Pilgr, Milan (referee) ; Hron, Lukáš (advisor)
The aim of this bachelor´s thesis is to design and check the football grandstand roof construction with ground plan dimensions of 30 x 105 m and a height of 20.5 m. Climatic loading is determinated for the location of the construction site - Ostrava. The resulting structural system was chosen spatially co-composed of trusses, purlins trusses, transverse and longitudinal stiffeners, columns and struts. The shape of the roof, which commemorates the air wing, is creating difficult conditions for wrapping air currents. Parts of the work are: technical report, structural analysis of the main structural elements and selected connections and drawings. The computational model for determination of internal forces is implemented in Scia Engineer. The review is created manually according to valid European standards.
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Adaptive control of magnetorheological dampers
Míša, Jiří ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
The topic of this master´s thesis is the design of adaptive damping algorithm for the prototype magnetorheological dampers, which are used for Formula Student vehicle. The prime output is the development and optimization of the control algorithm which included usage of the MBS software and real data from race track. Temperature compensation to supress the effect of dynamic viscosity of magnetorheological fluid due to the increase in operating temperature and testing of the vertical dynamic of the car on 4 - post test rig was realized as well. The main goal was to obtain better control of the car in transient situations and increase usability of tires via changes in damping based on actual conditions and status of the vehicle.
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Nonlinear Response of Steel Structures on Statical Loading
Nezbedová, Anna ; Vlk, Zbyněk (referee) ; Kala, Zdeněk (advisor)
This paper deals with the nonlinear response of steel structures to static loads. There are formulas derived for nonlinear analysis compressed, bended and tension members. By compressed elements, there is described the issue of buckling, by the bended, it is lateral-torsional buckling and tension elements are cables. As an example there is an calculation of a suspension two spans pedestrian steel bridge under load action of asymetrical loads. As another possible calculation process, the finite elements method is described.
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Equipment for installation and service of Spider ILD02
Frühbauer, Jiří ; Pokorný, Přemysl (referee) ; Malášek, Jiří (advisor)
This Bachelor’s thesis deals with constructional solution and design of handling equipment for assembly and service of Spider ILD02 lawnmower. This thesis presents a discretion and evaluation of several alternatives for given problem, which are followed up by establishment of selected technical parameters. This thesis also consists of selected solution of construction, which is followed up by calculation of handling forces. Conclusion describes calculation of structural load and strength inspection of important construction units. This thesis consists of technical report and drawing documentation. Drawing documentation is supported by model processing in 3D CAD system and also contains assembly drawing of the whole device, turntable shaft, lever shaft, large sprocket hub and housing of the stand.
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Lateral-torsional buckling of steel beams with restraints out of bending plane
Balázs, Ivan ; Vejvoda,, Stanislav (referee) ; Studnička,, Jiří (referee) ; Melcher, Jindřich (advisor)
The doctoral thesis focuses on problem of stability of steel thin-walled beams with lateral and torsional restraints along the spans. Theoretical background of lateral-torsional buckling of an ideal beam with and without restraints preventing out-of-plane buckling is briefly described. In the following chapters the problem of stabilization of steel thin-walled beams by planar members is dealt with. The state of the art in this field is summarized and some open questions are identified. The research in this field could bring new findings about actual behavior of these structural systems. The rate of stabilization can be quantified using values of shear and rotational stiffness provided to a thin-walled member by a planar member. In the frame of the thesis the problem of torsional restraint given to steel cold-formed members by sandwich panels under load is discussed. In case of the uplift load applied on the sandwich panels the torsional restraint should be verified by experimental analysis. To contribute to this field, experimental verification of rotational stiffness provided to steel cold-formed beams by sandwich panels was proposed and performed. Torsional restraint under no external load as well as under uplift load applied on the panels was investigated. The purpose was to obtain the values of the rotational stiffness provided by planar members. The performed tests indicate significant and practically applicable rate of the torsional restraint even in case of the uplift load on the surfaces of the panels. Utilization of the values of the rotational stiffness might result in more economical, effective and reliable structural design. Selected problems were investigated using numerical modeling in a finite element method based software.
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