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2. Optimizacija delovanja rotorja na rotorskih zgrabljalnikihUrban Lukanc, 2024, undergraduate thesis Abstract: V diplomski nalogi smo v podjetju SIP, d. d., obravnavali problem formiranja zgrabkov pri rotorskih zgrabljalnikih. Glavni fokus naloge je bil na
ekonstrukciji sledilnega mehanizma, nameščenega v notranjosti rotorja, ki služi za formiranje zgrabkov. S pomočjo programskega paketa SolidWorks smo izdelali model sledilnega mehanizma ter prilagodil pot le-tega za formiranje lepših zgrabkov. Hkrati sta bila v sklopu rekonstrukcije izdelana nova odkovka, ki služita kot nosilca ležaja, določen je bil tudi nov ležaj, ki se kotali po sledilnem mehanizmu za večjo obstojnost celotnega mehanizma. Rezultate delovanje starega sledilnega mehanizma v primerjavi z novim sledilnim mehanizmom smo primerjali v programskem paketu SolidWorks, pri čemer
smo ugotovili izboljšano delovanje novega mehanizma v primerjavi s starim.
Keywords: sledilni mehanizem, rotorski zgrabljalniki, rotor, SolidWorks, konstruiranje
Published in DKUM: 11.04.2025; Views: 0; Downloads: 0 |
3. Fatigue behaviour of copper-brazed 316L stainless steelJernej Kralj, Blaž Hanželič, Srečko Glodež, Janez Kramberger, Roman Satošek, Branko Nečemer, 2024, original scientific article Abstract: The plate heat exchanger (PHE) is a component that provides heat to be transferred from hot water to domestic cold water with-out mixing them with high efficiency. Over the lifetime of the PHE, cyclic pressure acts on the brazing points and the plates, andthis can lead to fatigue failure. The fatigue behaviour of the PHE, designed by using copper-brazed 316L (also known as 1.4404) stainless steel, was investigated by performing fatigue tests to obtain the S-N curve of the analysed brazed joint. The fatigue tests were performed on a Vibrophore 100 testing machine under the load ratio R= 0.1 for different values of calculated ampli-tude stress. Based on the obtained experimental results, an appropriate material model of the analysed brazed joint was created, which was validated with a numerical calculation in the framework of a program code Ansys. A validated material model canthen be used for the subsequent numerical analysis of the PHE.
Keywords: plate heat exchanger, brazed joint, fatigue, experimental testing
Published in DKUM: 10.04.2025; Views: 0; Downloads: 8
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4. Fatigue behaviour of PA66 GF30 at different temperaturesMarko Zadravec, Janez Kramberger, Branko Nečemer, Srečko Glodež, 2024, original scientific article Abstract: A comprehensive experimental investigation to understand the mechanical properties and fatigue behaviour of glass-reinforced polyamide (PA66 GF30) at different temperatures is presented in this paper. The specimens for quasi-static and fatigue testing were machined from previously extruded plates, where two orientations were considered: (i) the extrusion direction (ED) and (ii) the direction perpendicular to extrusion (PED). Both the quasi-static and fatigue tests were performed under different temperatures (22 ◦C and 100 ◦C). The fatigue tests were performed in a load control regime under pulsating loading (R = 0.1) to create S–N curves for all the temperatures and loading directions. The experimental results of the quasi-static tests showed that the test specimens manufactured in the extrusion direction have better mechanical properties when compared to those of the specimens manufactured perpendicular to the extrusion direction. Furthermore, the analysis of the quasi-static tensile test results showed that tensile strength, yield strength, and the modulus of elasticity are significantly dependent on the temperature and deteriorate when the temperature is increased from 22 ◦C to 100 ◦C. The results of the fatigue tests showed that at both the temperatures (22 ◦C and 100 ◦C), the samples produced in the direction of extrusion exhibited higher fatigue strength than those produced perpendicular to the direction of extrusion. For all the sample orientations, the fatigue strength decreased significantly with increasing temperature. The obtained experimental results could be very useful when designing and dimensioning different dynamically loaded engineering components made of PA66 GF30 subjected to high temperatures.
Keywords: PA66 GF30, increased temperatures, fatigue, experimental testing
Published in DKUM: 10.03.2025; Views: 0; Downloads: 5
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6. Uporaba superelastičnega materialnega modela za numerične simulacije stiskanja žilne opornice : magistrsko deloJernej Rihter, 2025, master's thesis Abstract: Žilne opornice omogočajo neoviran krvni obtok. Pogosto se za material žilnih opornic uporablja zlitina niklja in titana, znana pod komercialnim imenom Nitinol. Ta spada v skupino materialov z oblikovnim spominom. Posebna značilnost teh materialov je pojav superelastičnosti. Magistrsko delo proučuje vpliv uporabe superelastičnega in linearno elastičnega materialnega modela na rezultate simulacije stiskanja obroča žilne opornice, ki je parametrično modeliran v programskem jeziku Python in z uporabo knjižnic projektov PyAnsys (PyMAPDL). Rezultati so osredotočeni na napetosti in radialno togost, kjer opazujemo reakcijsko silo. Numerična simulacija temelji na metodi končnih elementov in je izvedena v programu Ansys. Analiza ob različnih materialnih modelih primerja tudi vpliv diskretizacije modela z enodimenzionalnimi in trodimenzionalnimi končnimi elementi. Rezultati magistrskega dela ugotavljajo, da ima materialni model pomemben vpliv na pravilen opis napetosti ob stiskanju obroča žilne opornice kot tudi na vrednosti reakcijske sile. Opazimo, da različna diskretizacija ne vpliva na reakcijsko silo, povzroča pa razlike v napetosti med obema modeloma.
Keywords: žilna opornica, spominske zlitine, superelastičnost, Nitinol, numerična simulacija, metoda končnih elementov, Ansys, Python, PyAnsys
Published in DKUM: 27.02.2025; Views: 0; Downloads: 31
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7. The development of patient-specific vascular stents using computational modeling and optimisation : doctoral disertationŽiga Donik, 2024, doctoral dissertation Abstract: Minimally invasive endovascular procedures are becoming a preferred approach to treat aortic dissection compared to traditional open surgery. Despite their advantages, endovascular options are currently limited to less complex geometries and are not without challenges. Endoleak, caused by the geometric mismatch between the straight cylindrical endograft and the curved aorta, remain a significant concern and lead to reinterventions. Understanding the underlying physical mechanisms governing the interfacial behavior of the seal zone is crucial to establishing guidelines for optimal stent sizing and developing more reliable endografts. Computational simulations are an essential tool in that regard, offering insights into the mechanical behavior of stents and aiding in their development. A computational study is performed to analyze the effects of endograft oversizing and artery curvature on potential endoleak. Based on identified mechanisms of endoleak creation, an optimal oversizing that minimizes potential endoleak is determined as a function of curvature. The findings will help develop new generations of endografts and define new standards. The Dissertation also involves computational modeling of a novel method to treat aortic arch dissection, where a bare metal stent is employed to expand the true lumen and displace the dissection flap. The simulation is compared to images from surgery, which shows a good agreement of the deformation patterns. An analysis of different dissection flap stiffnesses underscores the potential for this type of endovascular treatment if higher radial force can be provided by the stent. A methodology for lumen characterization is presented, based on which a personalized bare metal stent can be constructed for the aortic arch. Initial tailored stent designs indicate increased flap displacement compared to the original stent but encounter local instabilities at one of the support rings, which poses certain risks. Rectifying this design flaw is essential for advancing patient-specific bare metal stents, which hold the potential to revolutionize aortic arch dissection repair.
Keywords: endovascular aortic repair, TEVAR, vascular stent, endograft, aortic dissection, finite element analysis (FEA)
Published in DKUM: 17.10.2024; Views: 0; Downloads: 111
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8. Nadgradnja traktorske potisne prikolice : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnjeMihael Verdnik, 2024, undergraduate thesis Abstract: V diplomski nalogi je predstavljeno načrtovanje in izdelava nadgradnje traktorske potisne prikolice. Na začetku so analizirane obstoječe nadgradnje in izluščene uporabne ideje. Začetku sledi zahtevnik, ki vsebuje želje in zahteve naročnika, na podlagi katerih so identificirane funkcije nadgradnje in oblikovana funkcijska struktura. Zasnovani so različni koncepti za vsako funkcijo. Izbrani so najboljši koncepti, ki sestavljajo dve variantni rešitvi. Na podlagi stroškovne analize je izbrana najboljša variantna rešitev, ki je tudi zmodelirana. Poleg tega je izvedena trdnostna kontrola komponent s preračunom ter numerična analiza (MKE). Načrtovanju sledi izdelava in testiranje nadgradnje ter izračun dejanskih stroškov izdelave.
Keywords: konstruiranje, nadgradnja, traktorska potisna prikolica
Published in DKUM: 07.10.2024; Views: 0; Downloads: 26
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9. Nadgradnja kombiniranega tovornega vozila za prevoz krst : diplomsko deloPatrik Vogrin, 2024, undergraduate thesis Abstract: V diplomskem delu je predstavljena zasnova ter snovanje konstrukcije in dvižnega mehanizma za nadgradnjo kombiniranega tovornega vozila za prevoz krst. Na začetku je predstavljen zahtevnik, sledi mu razdelava naloge na funkcije ter osnovne koncepte. Temu sledi snovanje konstrukcije in dvižnega mehanizma s kratko MKE analizo in analitičnim izračunom.
Diplomsko delo prikazuje postopek izdelave celotne nadgradnje vozila. Predstavljen je celoten postopek razvoja izdelka ter njegove izdelave. Pri izdelavi nadgradnje so bili uporabljeni postopki 3D skeniranja vozila, modeliranje konstrukcije s pomočjo CAD programa SolidWorks in Creo ter kasnejša izdelava v podjetju.
Keywords: nadgradnja, dvižni sistem, 3D modeliranje, izdelava, električni linearni aktuatorji
Published in DKUM: 07.10.2024; Views: 0; Downloads: 46
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10. Uporaba umetne inteligence v konstruiranju : diplomsko deloVid Stanovnik, 2024, undergraduate thesis Abstract: Namen diplomskega dela je raziskati uporabo umetne inteligence pri procesu konstruiranja. Delo se osredotoča na uvajanje različnih orodij umetne inteligence in tehnik za izboljšanje učinkovitosti, natančnosti in inovativnosti v procesu načrtovanja in modeliranja. Predstavljene so teoretične osnove umetne inteligence, vključno s strojnim učenjem, nevronskimi mrežami in globokim učenjem. Analizirane so prednosti in slabosti uporabe umetne inteligence, kot so zmanjšanje človeških napak, izboljšana produktivnost, vendar visoki stroški in kompleksnost uvajanja. Poleg tega so predstavljeni praktični primeri uporabe umetne inteligence pri konstruiranju, vključno z orodji, kot so ChatGPT za generiranje zahtevnikov, Autodesk Fusion 360 za generativno oblikovanje in Solidworks za avtomatizacijo oblikovalskih procesov.
Keywords: umetna inteligenca, konstruiranje, generativno oblikovanje, globoki generativni modeli, strojno učenje, globoko učenje.
Published in DKUM: 30.09.2024; Views: 0; Downloads: 57
Full text (2,91 MB) |
