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Simulation of Large Particle Systems
Štambachr, Jakub ; Navrátil, Jan (referee) ; Juránek, Roman (advisor)
This bachelor thesis adresses the problem of large-scale particle system simulations. Its main goal is to create an efficient simulation model of cosmological N-body systems and its consequent testing. I chose to implement a version of Barnes-Hut Tree-Code algorithm, which meets the requirement for a high-speed simulation method. The tests carried out within the scope of this thesis imply that tree-code method is of a logarithmic complexity. As an output of this simulation model I present several videos, demonstrating in an illustrative fashion a functionality of the model.
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Fluid Simulation
Štambachr, Jakub ; Polok, Lukáš (referee) ; Jošth, Radovan (advisor)
This diploma thesis addresses the problem of liquid and gas simulation, it particularly deals with computer simulation of flow of viscous newtonian liquids with a free surface. A main goal of this work is to create an efficient simulation model, utilizing the benefits of current GPU parallel architecture for general-purpose computing. I chose to implement Smoothed Particle Hydrodynamics, a lagrangian particle-based method. A significant portion of this thesis consists of speed analysis of the implemented algorithm, comparison with other authors' achievements in the field and a demonstration of benefits brought by GPU involvement in the computation. As an output of the thesis I present an interactive computer program that allows for real-time simulation (and visualization) of water-like fluids.
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Systems Design of Correction Coding
Křivánek, Vítězslav ; Němec, Karel (advisor)
Due to growing transmission speed burst-forming errors tend to occur still more frequently not exclusively in data transmission. The presented paper concentrates on the search for alternative burst error correction solutions complementing the existing methods in use. Its objective is an elaboration of a detailed analysis of the issue of convolution codes for error burst correction which can be used in individual anti-error systems and thus an achievement of better results than those attained by mass application of the existing solutions. First the methods implemented to remove or suppress burst errors are briefly characterized. This part is followed by a detailed description of the individual systematic convolution codes by means of mathematical tools which extend the set of possible evaluative criteria of anti-error systems which can be applied while assessing proposals for individual solutions. The acquired code properties are compared with convolution codes as well as with other versions of proposals for message protection against an error burst. The processed convolution codes are subject to testing by means of Matlab mathematical programme simulation in order to validate the correctness of the derived mathematical tools. This is because simulation represents the principal method applied to verify and present an already proposed security process and enables the acquisition of a better overview of the issue at hand. The feasibility of the individual anti-error systems is then confirmed by way of creating a circuit behaviour description in the VHDL language. Its high portability presents a big advantage when drafting individual systems of the actual implementation.
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Motion control logic sequences making body in the topcoat
Křivánek, Filip ; Hloska, Jiří (referee) ; Škopán, Miroslav (advisor)
This thesis describes the finish-painting area at ŠKODA AUTO a.s. company in Mladá Boleslav. The logistic operations and transporter technology in this production hall are described here. Furthermore this thesis is concerned to sequence making of car body before the finish-painting area. The output evaluation is make of experiments and comparison of influence of an old logic of choosing a colored block with a new control logic for car body with influence on the correct shifting of car body according to a sequence number. The containers for car body including all other workplaces of the painting area are created in the Plant Simulation program.
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Verification of computer simulation in the field of thermal properties of foundry moulds
Šupa, Jan ; Rusín, Karel (referee) ; Cupák, Petr (advisor)
This diploma thesis deals with thermal qualities of moulding mixtures of foundry mould of various types of sand grains and a computer simulation of the solidification of the cast. The aim of this work is to compare the values of thermal qualities of moulding materials bonded with water glass taken in experimental measurements to the values of thermal qualities of moulding materials connected with organic binding agent contained in simulation software. A sample cast will be moulded in order to evaluate cooling capacities of individual moulding mixtures according the shift of thermal axis. These results will consequently be compared to the results of the simulation.
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Vibration Propagation Analysis of Coupled Structure Acoustic Space
Kostelník, Jan ; Pellant, Karel (referee) ; Novotný, Pavel (advisor)
The aim of this Master’s thesis Vibration Propagation Analysis of Coupled Structure Acoustic Space is to analyze vibration propagation in combustion engine, from combustion space through solid structure to fluid surroundings. Then analyze the noise increase as pressure changing in fluid space around the solid structure. There was made a analyze of single piston engine in different frequency and piston location. A simulation of distribution of a pressure waves was made in an ANSYS application.
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Crush Element Design at Vehicle RCAR Simulation
Rydlo, Tomáš ; Svída, David (referee) ; Ramík, Pavel (advisor)
The diploma thesis deals especially with basic crash test conducted by the organizations Euro NCAP and RCAR. On basis of RCAR standard for low speed crash test is designed crush element for a car Ford Taurus by using a virtual simulation. Thesis describes the selection, editing, and creating a finite element model and impact simulation to the barrier. The purpose was use a real vehicle, design into it a new crush element, try different shape and material implementation of crush element and make their comparison.
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Dimensional stability of investment Al castings
Úředníček, Lukáš ; Cileček, Jarmil (referee) ; Horáček, Milan (advisor)
The aim of this paper is to compare a bottom filling of a ceramic form made by lost wax process and a top filling conventional method. A computer simulation of filling and casting solidification will contribute to this comparison. The comparison includes evaluation of readings DAS and characteristic readings of porosity with chosen varieties of casting. The results show that the readings DAS did not change much but characteristic readings of porosity were much better at bottom filling. The computer simulation also showed a certain contribution in the field of model smelting technology.
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Differential amplifiers with bipolar transistors
Vyroubal, Petr ; Boušek, Jaroslav (referee) ; Horák, Michal (advisor)
This bachelor thesis deals with the theory of differential amplifiers with bipolar transistors, an overview of the basic connections and inspection their properties with the help of computer simulation program OrCAD PSpice. The specific type of differential amplifier is carried out experimental measurements, which perform as verification of simulated properties. The aim of this work is to analyze and compare the results obtained using the simulation program and the results obtained by laboratory measurements.
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