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HST Station at the Airport Brno Tuřany
Svobodová, Lenka ; Kyselka,, Mojmír (referee) ; Nový, Alois (advisor)
Main topic of this Masters Thesis is design of railway station for high speed line railway. Building site is situated in East Moravian region in the district of Brno-Tuřany. The building is designed as a detached two-storey object standing on the bridge over the railway. Mass of the building consists of two trimmed blocks which are mutually mirrored. The mass of both parts of the building is pervaded by illuminating stripe. Its shape is also based on the shape of trimmed block and rises over the surrounding surfaces. There are placed vertical paths in the stripes. It helps passengers in orientation because these are visible even from the outside of the building. This arrangement of individual masses symbolizes both direction of the arrival of trains to the station. There is placed arrival and departure hall in the middle of the object. Its height is similar to the height of the object itself. The hall is surrounded by the service facilities of the railway station situated on two floors. The supporting structure is made of steel. Both peripheral housing and roof are supported by the frame construction consisting of planar lattice beams. Construction of the façade is composed of frame system Wicona. The peripheral housing is tiled with panels of expanded metal.
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Steel structure of an industrial building
Jílek, Josef ; Puchner, Josef (referee) ; Sýkora, Karel (advisor)
This thesis deals with structure of the single-aisle steel industrial hall in accordance with the arrangements of the building with a span of 30 m, a height of 84 m and corresponding height of the cantilever of a crane track girder is 9,0 m. In the hall are considered two cranes with a capacity of 50/12,5 t and 32/8 t. The main bearing element is formed by lattic truss stored on solid pillar down anchored in transverse direction. Distance of transversal pillars is 12 m and between them designed hanging purlins. The structure is designed for the district of Brno.
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Model of geometry of micro-lattice structures for finite element method
Javorský, Dominik ; Maňas, Pavel (referee) ; Červinek, Ondřej (advisor)
The growing availability of additive manufacturing technology, such as SLM, enables the creation of innovative structural designs. An example of these are complex lattice structures which are used because of their excellent mechanical properties relative to weight. One significant challenge lies in production tolerances. These are not crucial for the majority of components. However, when dealing with lattice structures and their thin-walled geometry, manufacturing tolerances lead to substantial deviations in mechanical properties. The process of designing such structures and achieving results comparable to the experiment requires the use of non-standard methods. These methods are time-consuming and costly for obtaining real geometry. The real geometry is then used for numerical simulations based on the FEM principle. This thesis focuses on the impact of geometric imperfections occurring in BCC-type structures made of stainless steel 316L. During the solution, the real geometry was obtained through optical digitization using the ATOS Triple Scan scanner. Dynamic drop-weight tests were also conducted, and the obtained results were used to modify the geometry model in combination with the acquired real geometry. The aim was to minimize the deviation between experimental and numerical simulation results below 5%. The knowledge gained from this process was then applied in simulations investigating the impact of geometric imperfections. Deviations up to 30% were observed in simulations investigating the impact of geometric imperfections. These deviations can be minimized by incorporating the knowledge of real geometry into the design. The results also help determine the diameter range within which including geometric imperfections in the design is irrelevant. Furthermore, a significant impact of the node geometry on the results of numerical simulations was observed. This knowledge brought the values closer to the experimental data. Another important contribution of this work is the simplified geometry model. This model will enable the study of the impact of additional imperfections in a range that was previously unattainable.
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Creation of CAD data for structured parts
Kolář, Dominik ; Krčma, Martin (referee) ; Vaverka, Ondřej (advisor)
Lattice structures are a subset of cellular structures used, for example, for topological optimization of components produced by additive manufacturing. However, the design of the structures is very demanding in classical CAD (computer-aided design) modellers. One of the specialized software for structure design is nTop. This thesis describes the creation of a workflow in nTop to create structures with a combination of unit cell types defined by relative cell density. The creation of the workflow consisted of several parts. First, the unit cells of the structure were designed. Then, using polynomial interpolation in Matlab, the relative density to member diameters conversions were made, and finally a procedure for combining the different cell types into a single part was designed. Thus, the resulting workflow allows to build a part of any shape consisting of different cell types determined by relative density.
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Surface roughness of lattice structures produced by SLM technology
Bóssi, Adam ; Malý, Martin (referee) ; Jaroš, Jan (advisor)
Selective laser melting (SLM) is an additive manufacturing technique (AM), that allows production of complex geometries that can be found in lattice structures. Processing of magnesium-based materials with this technology is difficult because of their high reactivity. This bachelor’s thesis clarifies the effects of processing parameters (laser power and laser scan speed) on surface roughness of lattice structures. The theoretical part of this thesis deals with the issue of magnesium alloys and manufacturing of lattice structures. The practical part of this thesis contains the design of the experiment and evaluation of the given experiment. Based on the results of the experiment, the dependencies of process parameters were made on surface roughness and incline angle of struts. The main takeaway of this thesis for the reader is in familiarization with the issue of process parameters and their effect on surface roughness in lattice structures.
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Topological optimization and lattice structures for aerospace components
Petržela, Zdeněk ; Hutař, Pavel (referee) ; Paloušek, David (advisor)
Low product weight in combination with high mechanical properties play a crucial role in reducing operating costs in the aerospace industry. For this purpose, topology optimization and lattice structures are used. Additive manufacturing processes enable the production of optimized parts with geometric complexity. So far, no clear and comprehensive approach for designing a machine part with reduced weight in this way has been presented. The aim of this work was to map the topology optimization process with the use of lattice structures, corrected by experimentally determined production limits. Furthermore, the work deals with the implementation of the proposed methodology in optimization of a real machine part, its production from AlSi10Mg metal powder using selective laser melting technology, and verification of its manufacturing accuracy and vibration response. To determine the production limits, a series of lattice strut tests were performed. According to dimensional, weight and porosity analysis of lattice struts, a minimum applicable cross-section of the strut was chosen. Struts with this cross-section were subsequently applied into the beam samples with the BCC and BCCz lattice structure. Based on the mechanical response, the BCCz lattice structure was selected for application in the optimized part. For a more accurate mechanical behaviour prediction, based on actual lattice structure response, corrected elasticity modulus and yield strength value for BCCz lattice type were determined. These parameters were applied into FEM simulation in the lattice optimization phase. After solving the problem of lattice structure geometry export from FEM software, the optimization methodology could be completely defined, the part was manufactured, and the design potential was verified.
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Favorit Brno / cycling stadium - bicross track / architectural study - design / stage 2021/22
Nováková, Lucie ; Žalmanová, Petra (referee) ; Šindlar, Jiljí (advisor)
The assignment of the diploma thesis is an architectural study of a cycling stadium - velodrome in the Pisárky district in Brno for TJ Favorit Brno. The existing velodrome is located southwest on the edge of the Brno Exhibition Center on Křížovského Street. The Velodrome no longer meets the current requirements of track cycling, but it is historically valuable and has its genius loci. The new 250 m long wooden bike track (together with other parameters of the International Cycling Union) and its associated sports grounds are "inserted" into the existing velodrome, which is modified and reconstructed according to requirements. The grandstands have been preserved. The built-in building with a new track is then completely roofed, creating an enclosed space. As part of the stadium reconstruction, a new facility was also created for TJ Favorit Brno from a modular container system; These are changing rooms for athletes, administrative areas, and facilities for visiting clubs and athletes and IP areas. The container construction system for sports facilities is very practical, economical, fast, environmentally friendly, variable, and flexible to the current requirements of a constantly evolving sport. The Anteroom and ground floor in the southern part of the existing velodrome is equipped with services for the public: a cafe, souvenir shop, cash register, information center, service, and a bicycle and sports equipment store. The new track with grandstands is covered with ETFE foil anchored to new lattice trusses, which are connected to the existing roof.
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THE USE OF ELETRONIC MEASURING SYSTEMS FOR MONITORING STRUCTURES
Kovács, Pavel ; Zich, Miloš (referee) ; Doc.Ing. Karel Kubečka, Ph.D (referee) ; Daněk, Petr (advisor)
This thesis deals with the use of the electronic measuring systems for monitoring structures. The first part of this work is focused on mapping the available measuring systems for monitoring deformations and strains, from the point of their measurement accuracy, the real advantages and disadvantages, including examples of monitoring of constructions. In the second part were selected measuring systems for monitoring strains and deflection interest structure. Subsequently, the measuring system with online recording into the tested roof structure was installed and the loading test was performed. Obtained data were compared with other two independent measurements. In the last part of the thesis, the measured values of each independent measurements were compared together, and with the values calculated from the mathematical model. The achieved results show that the installed monitoring system is capable to reliably measure deformation of the structure in real time and thus to warn the building administrator against the potential danger in advance.
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Design of mold segment for molding tires manufactured using Selective Laser Melting
Kvaššay, Adrián ; Maňas, Pavel (referee) ; Rapant, Martin (advisor)
This diploma thesis deals with development and design modifications of tire mould segment which will be batch produced by additive technology Selective Laser Melting. Material for its production is maraging steel 1.2709. Lattice structure was used inside the segment construction. The geometry of the lattice cell was chose based on two main factors – eliminating production costs and providing sufficient stiffness. Strength of the segment was calculated by FEM. The functional sample was made and its distortion was analyzed by optical digitalization.
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