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1.
Modeliranje delovnega mesta s pomočjo tri-dimenzionalnega skenerja
Jakob Jakolič, 2024, master's thesis

Abstract: Digitalizacija se vse bolj uporablja na vseh področjih življenja, od poslovanja in izobraževanja do proizvodnje in komunikacije. Magistrska naloga obravnava vizualizacijo in razmestitev delovnih mest. Delovna mesta se zajamejo z nizkocenovnim tri-dimenzionalnim skenerjem Einstar SHINING 3D in vstavljajo v programski paket Factory Design Suite, podjetja Autodesk. Magistrsko delo ugotavlja, ali lahko pridobimo uporabne modele z resničnimi teksturami, in, če jih lahko smiselno umestimo v digitalni dvojček proizvodnje. Digitalni dvojček proizvodnje se uporablja za lažji pregled nad proizvodnjo in pri morebitni novi razmestitvi delovnih mest.
Keywords: digitalizacija, razmestitev delovnih mest, 3D skener
Published in DKUM: 03.06.2024; Views: 63; Downloads: 8
.pdf Full text (5,16 MB)

2.
Optimizing smart manufacturing systems using digital twin
Robert Ojsteršek, Aljaž Javernik, Borut Buchmeister, 2023, original scientific article

Abstract: Presented paper investigates the application of digital twins for the optimisation of intelligent manufacturing systems and focuses on the comparison between simulation modelling results and real-world production conditions. A digital twin was created in the Simio software environment using a data-driven simulation model derived from a real-world production system. Running the digital twin in real time, which was displayed graphically, facilitated the analysis of key parameters, including the number of finished products, average flow time, workstation utilization and product quality. The discrepancies were attributed to the use of random distributions of input data in the dynamic digital twin, as opposed to the long-term measurements and averages in the real-world system. Despite the limitations in the case study, the results underline the financial justification and predictive capabilities of digital twins for optimising production systems. Real-time operation enables continuous evaluation and tracking of parameters and offers high benefits for intelligent production systems. The study emphasises the importance of accurate selection of input data and warns that even small deviations can lead to inaccurate results. Finally, the paper high-lights the role of digital twins in optimising production systems and argues for careful consideration of input data. It highlights the importance of analysing real-world production systems and creating efficient simulation models as a basis for digital twin solutions. The results encourage extending the research to different types of production, from job shop to mass production, in order to obtain a comprehensive optimisation perspective.
Keywords: smart manufacturing, digital twin, optimisation, simulation modelling, Simio, case study
Published in DKUM: 25.03.2024; Views: 171; Downloads: 9
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3.
The impact of changing collaborative workplace parameters on assembly operation efficiency
Klemen Kovič, Aljaž Javernik, Robert Ojsteršek, Iztok Palčič, 2024, original scientific article

Abstract: Human–robot collaborative systems bring several benefits in using human and robot capabilities simultaneously. One of the critical questions is the impact of these systems on production process efficiency. The search for high-level efficiency is severely dependent on collaborative robot characteristics and motion parameters, and the ability of humans to adjust to changing circumstances. Therefore, our research analyzes the effect of the changing collaborative robot motion parameters, acoustic parameters and visual factors in a specific assembly operation, where efficiency is measured through operation times. To conduct our study, we designed a digital twin-based model and a laboratory environment experiment in the form of a collaborative workplace. The results show that changing the motion, acoustic and visual parameters of the collaborative workplace impact the assembly process efficiency significantly.
Keywords: collaborative robot, collaborative workplace, digital twin, assembly operation, efficiency
Published in DKUM: 26.02.2024; Views: 218; Downloads: 5
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4.
Audio-visual effects of a collaborative robot on worker efficiency
Aljaž Javernik, Klemen Kovič, Iztok Palčič, Robert Ojsteršek, 2023, original scientific article

Abstract: Collaborative workplaces are increasingly used in production systems. The possibility of direct collaboration between robots and humans brings many advantages, as it allows the simultaneous use of human and robotic strengths. However, collaboration between a collaborative robot and a human raises concerns about the safety of the interaction, the impact of the robot on human health, human efficiency, etc. Additionally, research is unexplored in the field of the collaborative robot’s audio-visual effects on the worker’s efficiency. Our study results contribute to the field of studying collaborative robots’ audio-visual effects on the worker’s behavior. In this research, we analyze the effect of the changing motion parameters of the collaborative robot (speed and acceleration) on the efficiency of the worker and, consequently, on the production process. Based on the experimental results, we were able to confirm the impact of robot speed and acceleration on the worker’s efficiency in terms of assembly time. We also concluded that the sound level and presence of a visual barrier between the worker and robot by themselves have no effect on the worker’s efficiency. The experimental part of the paper clearly identifies the impact of visualization on work efficiency. According to the results, the robot’s audio-visual effects play a key role in achieving high efficiency and, consequently, justifying the implementation of a collaborative workplace.
Keywords: collaborative robot, worker efficiency, motion parameters, visual contact, sound, human-robot symmetry, repeated measures ANOVA
Published in DKUM: 11.12.2023; Views: 269; Downloads: 22
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5.
Vpliv parametrov sodelovalnega robota na fizično in psihično obremenitev delavca : magistrsko delo
Luka Falež, 2023, master's thesis

Abstract: V magistrskem delu je obravnavana tema sodelovalnih robotov. Z naraščanjem potrebe po bolj prilagodljivi proizvodnji raste tudi število vpeljanih sodelovalnih robotov, ki skupaj s človekom predstavljajo visoko prilagodljiva, produktivna in ekonomsko upravičena delovna mesta. Pri neposrednem sodelovanju med robotom in človekom je nujno potrebno raziskati kakšen vpliv ima sodelovalni robot s svojim delovanjem na človeka in njegovo psihofizično stanje. V teoretičnem delu so predstavljene osnove sodelovalnih robotov in njihova interakcija z ljudmi, te pa v nadaljevanju služijo kot podlaga za zasnovo eksperimentalnega sodelovalnega delovnega mesta, s katerim vrednotimo vpliv hitrosti delovanja sodelovalnega robota na človekovo psihično in fizično stanje. Obremenitev človeka smo med eksperimentom vrednotili s pomočjo standardiziranega vprašalnika NASA TLX in zajemanjem EKG signala (elektrokardiogram). Po uspešno izvedenem eksperimentu s štiriinštiridesetimi sodelujočimi smo z analizo podatkov jasno pokazali vpliv hitrosti delovanja sodelovalnega robota na zaznano obremenitev. Subjektivno zaznana obremenitev se je skozi scenarije povprečno povečala za kar 223 %, indeks stresa pa se je povečal iz 9,89 na 12,28, kar nakazuje močan vpliv hitrosti delovanja sodelovalnega robota na človeka.
Keywords: sodelovalni roboti, sodelovanje med robotom in človekom, psihična in fizična obremenitev, eksperimentalni pristop, NASA TLX, EKG
Published in DKUM: 18.09.2023; Views: 386; Downloads: 0
.pdf Full text (15,65 MB)

6.
Aplikativni primer razmeščanja delovnih mest s pomočjo računalniške podpore : magistrsko delo
Aljaž Javernik, 2021, master's thesis

Abstract: Magistrsko delo obsega teoretično področje oblikovanja proizvodnih sistemov kot študijo aplikativnega primera. Osnovni problem aplikativnega primera je predstavljala razmestitev delovnih mest v proizvodnem procesu. Primer je podprt z uporabo analitičnih preračunov (izračuni za planiranje kapacitet, diagram toka, OD-KAM matrika, trikotna metoda) in razširjen s pomočjo računalniških okolij, kot so Autodesk Inventor, AutoCAD Mechanical in Autodesk Process Analysis. Kljub izvedenim analitičnim izračunom je uporaba simulacijskih okolij omogočila prikaz morebitnih težav delovanja proizvodnega sistema, katerih s samo uporabo analitičnih metod ne zaznamo oz. izpustimo. Primer obsega izvedbo treh simulacijskih scenarijev, kateri kljub pomanjkanju specifičnih podatkov sistem dodobra opišejo in pripomorejo k boljšemu razumevanju delovanja proizvodnega sistema. Po uspešno zaključenih izračunih in simulacijah so predstavljeni dobljeni rezultati, ki so tudi ustrezno analizirani in ovrednoteni.
Keywords: Razmeščanje delovnih mest, načrtovanje in oblikovanje proizvodnih sistemov, simulacije proizvodnih sistemov, programsko orodje Autodesk.
Published in DKUM: 03.08.2021; Views: 1189; Downloads: 147
.pdf Full text (4,42 MB)

7.
Zasnova dvosmernega teleskopskega hidravličnega valja za stiskalnico : diplomsko delo
Aljaž Javernik, 2019, undergraduate thesis

Abstract: Ena glavnih komponent stiskalnice je hidravličen valj. V našem primeru stiskalnica stoji v nizkem prostoru, kjer glede na željen delovni hod ni mogoče zasnovati normalnega hidravličnega valja. Glede na dovoljeno višino delovni hod valja ter ostale pogoje smo zasnovali dvosmeren teleskopski hidravličen valj. Diplomska naloga vsebuje pregled literature o že obstoječih rešitvah, zasnovo dvosmernega teleskopskega hidravličnega valja, teoretične preračune, opis delovanja hidravličnega sistema ter vso potrebno dokumentacijo za izdelavo valja. Valj je zasnovan tako, da izpolnjuje naročnikove želje ter omogoča normalno delovanje stiskalnice.
Keywords: dvosmeren hidravličen teleskopski valj, stiskalnica, zasnova, pogon
Published in DKUM: 19.09.2019; Views: 925; Downloads: 105
.pdf Full text (5,06 MB)

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