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UAV design for civil and commercial purposes
Linhartová, Simona ; Křenek, Ladislav (referee) ; Vespalec, Arnošt (advisor)
The topic of this bachelor thesis is design of an UAV suited for commercial and civil use. The goal is to create a drone with compact looks and user–friendly composition that fulfils ergonomic and technical needs in compliance with professional use. The thesis includes the state of the art in the field, design and technical analysis that shall present the reader to contemporary issues in the field of UAV.
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Design of single-purpose cutting machine for shortening of plant stems
Žižka, Jakub ; Brandejs, Jan (referee) ; Vespalec, Arnošt (advisor)
This bachelor thesis deals with the design of a single-purpose machine for cutting plant stems. The task of the machine is to cut already partially shortened and stripped wheat straw stalks to the required length. The operation of the machine is fully automated, the operator only ensures the supply of semi-finished products to the machine, removes the finished stalks and controls the operation of the machine. In the thesis is a search describing the existing technologies used for cutting plant stalks, the possibility of driving a single-purpose machine and possible solutions for transporting stalks. The research also includes an analysis of the necessary mechanical and physical properties of wheat stalks. Subsequently, the analysis of information from the research part of the thesis and the definition of important parameters for the design construction balance sheet is performed. In the practical part of the work are developed concepts of possible solutions of individual structural nodes and justification of the choice of individual solutions. The second part of the practical part deals with the construction design of a selected conceptual design, including calculations. The work shows a possible solution for the construction of a machine for processing semi-finished products with a large variety of shapes.
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Advanced materials for FDM/FFF 3D print
Rygl, Michal ; Vespalec, Arnošt (referee) ; Koutecký, Tomáš (advisor)
The presented work deals with the issue of FDM / FFF 3D printing with a focus on materials with added carbon fiber. The aim of this work is to experimentally analyze the effect of carbon additive on printed parts using mechanical and thermomechanical tests. Testing of selected materials has shown that the effect of carbon additive varies according to the used base material. For example, carbon in PET-G has reduced impact strength by up to 64%. However, carbon filled CPE has demonstrated the ability to absorb impact energy up to by 28.5%. The different effect of carbon fiber was measured on the CPE material in a tensile test, where the yield strength was reduced during the stretching of the samples at room temperature, but the modulus of elasticity was increased. The absolutely positive effect of carbon was measured on all observed polymer filaments in the thermomechanical 3-point bending test, when the carbon versions of the materials achieved better results. The measured data brings an extension of the possibility of comparing the results with other types of materials suitable for 3D printing in the field of research. From a practical point of view the test results can be used for the actual choice of material when printing models has specific conditions of use. Another practical use of the analyzed data is the use of printable results of advanced materials for the creation of print profiles for other desktop 3D printers of the FDM/FFF type.
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Modification of printhead for 3D print of concrete
Diakov, Jakub ; Paloušek, David (referee) ; Vespalec, Arnošt (advisor)
This bachelor’s thesis deals with the engineering design of the adjustment of the jet used for continuous 3d printing of the concrete mixtures which are used for the printhead which already exists. The main function of the jet is to shape and deposit the printed mixture in a way that it corresponds to the required geometry of the product. The thesis contains a research focused on the issues of 3D printing such as properties of concrete flow, influence of the shape and size of the end of the jet on printing and individual mechanisms related to the optimal use of these jets. The second part of the thesis contains the analysis of knowledge and the determination of the appropriate parameters for the construction of the jet. These parameters influence the geometry and the quality and effectiveness of production. The practical part of the thesis is focused on the possible structural design of the jet adjustment based on the knowledge from the research part of the thesis. The practical part also deals with the design of the jet in a way the flaws and imperfections occurring in case of the previous constructions of the jets. In case of use of the jet designed in the corresponding way, the production can be substantially accelerated, and the quality of products can be substantially higher.
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Design of Stationary Machine for Threadig Plastic Sheathing on Wide Bandsaw Blades
Riedl, Jan ; Vespalec, Arnošt (referee) ; Koutný, Daniel (advisor)
This thesis deals with the design of a machine for threading plastic sheathing on single-sided band saw blades with dimensions from 4500 x 80 x 1.0 mm to 12500 x 290 x 1.85 mm. The aim of the thesis is to create an assembly model, the text is focused on a detailed description of the machine. The device was designed in SOLIDWORKS software. The main goal and partial goals of the thesis were met. The thesis is developed to the level of structural design and assembly description, along with calculations of key parts in the structural solution. The method of operating the machine is outlined. The thesis can serve as a starting point for future designs of a machine for threading protective plastic sheathing on saw bands of the stated dimensions.
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Comparison of tensile properties of polymeric samples produced by extrusion based 3D printing
Krajcar, Ivo ; Vespalec, Arnošt (referee) ; Škaroupka, David (advisor)
The subject of this work is a summary of the contemporary knowledge about 3D printing and mechanical properties of a prototype manufactured this way. Main goal is to compare the frequently used FDM method with the innovative APF method of 3D printing from the Arburg company. ASA and CPE materials were chosen for researching this method. On these materials, tensile strength was measured. Aditionally, for comparison between the two methods, referential samples manufactured by injection moulding were made. A percentual difference in strength of each sample was compared against these. 60 samples in total were made for this comparison. After evaluation of the results, it was found that in the tensile strength the samples made by the APF method are approximately 30 % less strong than the referential sample. The samples made by the FDM method are approximately of the same strength as the referential sample.
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Spatial 3D printing methods
Skurka, Šimon ; Vespalec, Arnošt (referee) ; Krčma, Martin (advisor)
This bachelor's thesis deals with methods of spatial 3D printing, which can solve many problems of manufacturing by fused deposition modelling. The aim of this thesis is to describe their strengths and weaknesses, requirements for hardware, software and their benefits to the world of 3D printing. Methods are introduced in the first part of the thesis, while the final evaluation is placed further.
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3D printing quality evaluation using optical digitization
Schäffer, Matúš ; Vespalec, Arnošt (referee) ; Paloušek, David (advisor)
This thesis focuses on description of selected differences in printing strategy and functionality of proprietary and commercial slicer. These are tested by specially created experiments using the same FDM table printer and filament. 3D optic digitisation is employed to support accurate measuring of individual experiments. Then 3D scans are examined in inspection software which allows to attain the figures describing dimension and geometry accuracy. Subsequently, the results are analysed and the conclusion is defined.
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Design of the autonomous snow groomer
Vespalec, Arnošt ; Surman, Martin (referee) ; Škaroupka, David (advisor)
The subject of this master’s thesis is the design of an autonomous snow groomer intended for the treatment of well-geodetically mapped slopes of ski resorts. Designed design uses an innovative approach to detecting the thickness of a snow cover by an electromagnetic sensor system. The work identifies and presents the concept of solving specific problems of autonomous operation in ski areas, in the form of a design vision. This concept is presented and verified using a parametric model.
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Design of Medical Thermal Imaging Camera
Vespalec, Arnošt ; Haltof, Vladimír (referee) ; Rubínová, Dana (advisor)
The aim of this thesis bachelor is the design of the medical thermal imaging camera, which will be its solution respecting technical, ergonomic and economic requirements. Among other things, it includes an overview of the current market situation, with an emphasis on the development of new technologies, including experimental.
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