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Measurement and modelling of power SiC MOSFET transistors
Darjan Molnar, 2021, master's thesis

Abstract: The increasing demand for smaller, faster, and more efficient switch mode power supplies (SMPS) and energy converters has led to the development of new power MOSFET technologies, such as SiC (silicon carbide) power MOSFET transistors. Switching parameters, output voltages and currents and power consumption need to be measured accurately to assess different types of power electronics components more efficiently in today’s rapid implementation of new energy transfer and modulation technology. The need for improving switching circuits in power electronics and trying to use simple simulation circuits for designing PCBs to measure output values of said power electronics transistors is the basis of this thesis. Even though manufacturers of power electronics transistors provide data on drain-source voltages and currents, these are mostly measured for specific conditions regarding pulse duration, gate-source voltage, case temperature of the transistor etc., and as such do not provide information as to where the limits of the drain source voltages and currents for different measurement parameter values are. The goal of the thesis is to find a way to measure the limits of drain-source voltages and currents of power electronics transistors (in this case a SiC MOSFET transistor), and to see if a simple SPICE-model could be built for other power electronic transistors as well, based on the results of this thesis.
Keywords: SiC, MOSFET, transistor, simulation, PCB
Published: 02.06.2021; Views: 101; Downloads: 10
.pdf Full text (4,35 MB)

Laboratorijski oblagalnik tablet
Matej Štrucl Rojko, 2020, undergraduate thesis

Abstract: V diplomskem delu je predstavljen razvoj naprave za oblaganje tablet. Posebnost te naprave je transparentno zunanje ohišje, ki omogoča spremljanje in nadzor procesov med postopkom oblaganja. V programskem okolju SOLIDWORKS je bil izdelan virtualni 3D model in tehnična dokumentacija. S pomočjo vtičnika Flow Simulation je bila narejena numerična simulacija za optimizacijo toka zraka skozi vhodni nastanek. Na podlagi načrtov je podjetje RAJH PLUS d.o.o. izdelalo delujoč prototip.
Keywords: laboratorijski oblagalnik tablet, konstruiranje, Solidworks Flow Simulation
Published: 24.09.2020; Views: 172; Downloads: 51
.pdf Full text (2,88 MB)

Ergonomsko oblikovanje delovnega mesta na montažni liniji žarometov
Aljaž Majcen, 2020, undergraduate thesis

Abstract: V diplomski nalogi ergonomsko oblikovanje delovnega mesta na montažni liniji žarometov je predstavljena ergonomska analiza delovnega mesta na montažni liniji žarometov. V uvodu je predstavljeno podjetje, znanstvena veda ergonomija, ter njena načela. Opisani sta tudi ergonomski metodi OWAS in RULA, ter programski paket Tecnomatix Jack. Osrednji del diplomske naloge predstavlja predstavitev delovnega mesta, ki je predmet analize, ocena kontrole z vidika ergonomskih načel in opravljene ergonomske analize. Analize so opravljene ročno in računalniško z uporabo paketa Human simulation Jack. V zaključnem delu diplome so predstavljeni rezultati vseh analiz in predlogi izboljšav.
Keywords: ergonomija, Human simulation Jack, OWAS, RULA, ergonomske metode, ergonomska analiza
Published: 22.09.2020; Views: 219; Downloads: 62
.pdf Full text (2,56 MB)

Electrified powertrain configurator
Jernej Kosi, 2019, master's thesis

Abstract: This master’s thesis describes the development, use and simulation results of the Excel based electrified powertrain configurator tool. First, different electrified powertrains are introduced and divided based on the powertrain type. Within the scope of this master’s thesis, we focused on battery electric vehicles. A mathematical vehicle model was developed to describe different battery electric vehicle powertrain architectures. The mathematical vehicle model was implemented in Excel. The performance of the Excel tool was demonstrated by simulating various driving cycles. To evaluate the accuracy and usability of the tool, simulation results from Excel tool were compared with those from AVL Cruise.
Keywords: electrified powertrain, vehicle longitudinal dynamic, driving simulation, Excel, tool development
Published: 23.12.2019; Views: 470; Downloads: 0

Technological valley of death as an emergent evolutionary phenomenon
Petra Fic, 2019, master's thesis

Abstract: Perceptual researchers often argue that natural selection supports veridical perceptions, respectively those that accurately reflect the environment. They also claim that beings whose perceptions are truer are also more fit. This assumption was tested using standard tools of evolutionary game theory in a simple environment. The result was that more veridical perceptions are not necessarily more successful. In the majority of the parameter space, veridical perceptions are extinct in competition with simplified perceptions, based on adaptive behavior in a given environment. In the thesis, we build upon mentioned territorial games introduced by Mark, Marion, and Hoffman in 2010, and extend four of their territory perception and selection strategies with two novel ones that together constitute a model of technological readiness valley of death. Whenever utility of a resource is not monotonous in the amount of that resource, the technological valley of death emerges. While the development of the science behind these models is in its infancy, modeling and understanding the phenomenon may shed light on progress and related phenomena in society.
Keywords: evolution, perception, utility, Monte Carlo simulation, game theory
Published: 22.11.2019; Views: 455; Downloads: 61
.pdf Full text (1,56 MB)

Ergonomska študija in optimizacija delovnega mesta končne kontrole
Matic Breznik, 2018, undergraduate thesis

Abstract: V diplomskem delu je ročno in s pomočjo programske opreme Human simulation Jack ocenjeno delovno mesto končne kontrole v podjetju KLS Ljubno, d. o. o. Bistvo dela sta ergonomska študija in optimizacija delovnega mesta. V uvodnem delu je predstavljeno podjetje, pomen ergonomije in obrazložitev, kako se bom lotil rešitve problema. V osrednjem delu je prikazana celotna analiza delovnega mesta in izsledki, ki so bili pridobljeni ročno ter z uporabo programske opreme. V zaključnem delu pa so predstavljeni optimizacija in predlogi za izboljšanje delovnega mesta, z največjim poudarkom na uvedbi kontrolne linije za končno kontrolo.
Keywords: ergonomija, optimizacija, Human simulation Jack, končna kontrola, OWAS, analiza ledvenega dela hrbtenice
Published: 17.09.2018; Views: 618; Downloads: 109
.pdf Full text (3,51 MB)

Design of geometry and numerical simulation of the operating characteristic of the rotor of the wind turbine
aljaž Janič, 2018, undergraduate thesis

Abstract: The diploma thesis consists of design and numerical simulation of the wind turbine. Geometries are designed according to two theories, the Betz theory and the Schmitz theory. I used Solidworks for 3D modeling of the both rotors. Using Ansys software package, we performed numerical simulations of a rigid body for two different wind speed regimes. We were interested in the angular velocity of the spinning blades, which in combination with moment give us power.
Keywords: Renewable energy, wind energy, numerical simulation, wind turbine, blade design, Betz and Schmitz theory
Published: 09.08.2018; Views: 712; Downloads: 149
.pdf Full text (2,19 MB)

Reinforced piled embankment for a high-speed railway over soft soil
Yan Zhuang, Xiaoyan Cui, 2015, original scientific article

Abstract: A geosynthetic, reinforced, piled embankment is an effective and economic method to solve the problems of possible bearing failure, unacceptable settlement and slope instability for an embankment built over soft soil; this has led to its widespread use, especially for high-speed railway embankments. Some design methods have been developed to assess the performance of these reinforced structures, which are mainly based on the results from small-scale models and numerical simulations. However, the reliability of these methods needs to be validated under full-scale field tests. This paper presents a numerical and analytical study for a full-scale field test of the Fengyang high-speed railway embankment. The results were analyzed and discussed in terms of the settlement of subsoil, the stressconcentration ratio (SCR), the axial force and the frictional stress of the pile. They showed that the settlement of the subsoil, from both the finite-element method (FEM) and the analytical method, were in good agreement with the measurement, and thus was a reliable parameter to assess the performance of the piled embankment with reasonable accuracy. The SCR was overestimated by the modified Terzaghi method, with a difference of 25%, while it was underestimated by the FEM, with a difference of approximately 20%. It was also shown that the tensile force in the reinforcement could be effectively assessed using the proposed analytical method, while it was overestimated by the FEM with a difference of 44%.
Keywords: reinforced piled embankment, high-speed railway, numerical simulation, analytical method
Published: 15.06.2018; Views: 618; Downloads: 43
.pdf Full text (578,98 KB)
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The geo-mechanics behaviour of soft marine silts under a nearshore rubble-mound breakwater
Lien-Kwei Chien, Feng Tsung-Shen, Tsung-Ching Chen, 2009, original scientific article

Abstract: In this study, the soft marine silts under a rubble-mound breakwater in Ma-Zu of west Taiwan are adopted as a test sample. The specimens were prepared by a new, remolded method at dry density and consolidated stresses. Tri-axial shear-strength tests were performed to evaluate the pore-water pressure and the shear strength. The test results show that the pore-water pressure increases gradually and is close to the critical values as the axial strain increases. In addition, under isotropic and K0 consolidation, both the c and c' of the soft marine silts were 0 kPa, which means that the silts do not have any shear resistance, just like fluid under a rubble-mound breakwater. Based on the linear-elasticity and the one-dimensional consolidation theory, the model of the settlement and stability was evaluated in SIGMA/W. The results show that the soft marine silts at the breakwater induced a displacement, greatly increasing with the filling rubble-mound loading. The figures and results can be referenced for a stability evaluation of the silt soil deposits under the rubble-mound breakwater. The results are useful for marine silts mechanics and a stability analysis for the planning, design, and related research on near-shore engineering.
Keywords: geo-mechanics behavior, soft marine silt, rubble-mound breakwater, settlement, numerical simulation mode
Published: 06.06.2018; Views: 581; Downloads: 46
.pdf Full text (1,18 MB)
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