1. Analiza procesa zajemanja in praznjenja elevatorja s korci z uporabo numeričnega orodja Ansys RockyMihael Arčan, 2024, diplomsko delo Opis: Pri transportu materiala v vertikalni ali poševni smeri se v praksi pogosto uporabljajo elevatorji, ki omogočajo učinkovito transport različnih vrst razsutega tovora. V okviru diplomskega dela smo obravnavali transport izbranega elevatorja s korci ter izvedli simulacije v numeričnem orodju Ansys Rocky. S pomočjo orodja smo analizirali različne oblike korcev. Zanimalo nas je, kako oblika korca vpliva na zmogljivost elevatorja, pretoke po zajemanju, pretoke v povratni veji ter obrabo korcev. Iz simulacij smo ugotovili, da se je pri našem elevatorju s korci najbolj obrabljal plitek korec. Plitek korec je imel najboljšo zmogljivost in je edini dosegel zahtevano zmogljivost. Ključne besede: elevator s korci, metoda diskretnih elementov, sipki material, numerično orodje Objavljeno v DKUM: 22.10.2024; Ogledov: 0; Prenosov: 16
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2. Innovative approaches to wear reduction in horizontal powder screw conveyors : a design of experiments-guided numerical studyMarko Motaln, Tone Lerher, 2024, izvirni znanstveni članek Opis: Numerical simulations play a vital role in the modern engineering industry, especially when faced with interconnected challenges such as particle interactions and the structural integrity of conveyor systems. This article focuses on the handling of materials and emphasizes the importance of using parametric numerical analysis to improve efficiency, reduce wear, and enhance the structural integrity of horizontal screw conveyors. Through the utilization of the Design of Experiments, we systematically investigated critical parameters such as screw pitch, clearance, wear, rotational velocity, and additional structural factors. This examination was carried out within a well-defined parametric framework, utilizing a combination of software tools provided by the Ansys suite and Minitab. The findings demonstrate the effectiveness of the Design of Experiments analysis in achieving improved performance and provide valuable insights for engineers and researchers involved in the design of conveyor systems. Furthermore, this comprehensive approach clarifies how conveyor systems respond to changes in parameters and highlights the complex interaction between transported particles and the conveyor system. We present a detailed analysis that clarifies the complex relationships and dependencies among different parameters, providing engineers and researchers with valuable insights. By understanding the interactions of these factors, the methodology provides not only results but also a strategic framework for advancing conveyor system design and engineering practices. Ključne besede: discrete element method, design optimization, horizontal screw conveyors, parametric study, conveying equipment, bulk handling, bulk solids, abrasive wear, screw conveyor, FEA, performance analysis Objavljeno v DKUM: 09.04.2024; Ogledov: 275; Prenosov: 44
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3. Energetska učinkovitost avtomatiziranih regalnih skladiščnih sistemov pri uporabi tehnologije regeneracije energije : primer avtomatskega skladiščenja v jeklarski industrijiMarko Motaln, Boris Jerman, Anja Žagar, Jurij Hladnik, Tone Lerher, 2023, strokovni članek Opis: Z namenom doseganja visoke zalogovne velikosti in zahtevane pretočne
zmogljivosti se tudi v jeklarski industriji vse pogosteje uporabljajo avtomatizirani
regalni skladiščni sistemi za uskladiščenje težkih polizdelkov
oz. jeklenih palic in profilov, nameščenih v namenskih kasetah. Izrazito
visoka teža jeklenih palic in profilov ter zahtevane pretočne zmogljivosti z
dodatnimi zahtevami tehnično robustnega in visoko učinkovitega skladišča,
prinaša s sabo tudi visoko potrošnjo električne energije za delovanja
skladišča. V članku je na primeru avtomatiziranega regalnega skladišča za
jeklene palice in profile predstavljena možnost zmanjšanja porabe električne
energije z uporabo koncepta regeneracije pri zaviranju regalnega dvigala
in spuščanju dvižne mize regalnega dvigala. Ključne besede: tehniška logistika, avtomatizirana regalna skladišča, energijski model skladišča, regeneracija energije, analiza učinkovitosti Objavljeno v DKUM: 19.02.2024; Ogledov: 330; Prenosov: 28
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4. Numerical simulation of conveying fine powders in a screw conveyor using the discrete element methodMarko Motaln, Tone Lerher, 2023, izvirni znanstveni članek Opis: Due to their high efficiency and spatial utilization, screw conveyors are widely used in pharmacy, agriculture, and industry. Recently, this has made it a popular research subject in the numerical modelling of the transport of bulk solids. Modelling of granular systems at the level of individual particles is mainly possible due to the use of discrete numerical methods. The most common is the use of the Discrete Element Method (DEM), which is still limited from the point of view of simulations on an industrial scale, as increasing the size of the system also increases the cost of simulation. Certain powders with low density, large angles of repose, poor fluidity, and bad flowability can accumulate during transportation, causing inaccurate and non-uniform movement. Additionally, the friction and impact between the particles can cause wear. To address these issues, the present study utilizes the discrete element method to simulate and analyse powder transportation in an inclined screw conveyor using the commercial software ANSYS-ROCKY. Numerous phenomena that arise while transporting and feeding small-sized or irregularly shaped particles, often present in industrial processes, remain insufficiently investigated. This paper aims to analyse the transportation process of adhesive powders in a screw conveyor, with a focus on evaluating the impact of different screw blade speeds on transport. Multiple simulations were conducted, along with the implementation of an additional wear model, to better understand the transport phenomena and wear. An example was used to demonstrate the impact of screw speed on the wear of the transporter due to the interaction between the material and the structure of the conveyor, power consumption, and performance. Ključne besede: abrasive wear, bulk handling, coarse graining, conveying equipment, discrete element method, screw conveyor Objavljeno v DKUM: 12.09.2023; Ogledov: 457; Prenosov: 68
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5. Planning and construction of the lifting and towing device of the autonomous mobile robot MiR 100 for the delivery of transport trolleys in intralogisticsTone Lerher, Aleš Belšak, Rok Skerbiš, Jure Tumpej, Žiga Volavšek, Domen Stamenov, Marko Motaln, 2022, objavljeni znanstveni prispevek na konferenci Opis: Intralogistics is a very important area in warehousing and production for managing the flow of materials and informational flow. In recent years, automation and especially robotisation have had a major impact on throughput performance in intralogistics. Especially important is the transport of materials and products based on automated guided vehicles (AGVs) and autonomous mobile robots (AMRs) with different top modules,
such as the lifting and towing device.
In this paper, planning and construction of the lifting and towing device of the autonomous mobile robot MiR 100 for the delivery of transport trolleys in intralogistics is presented. Using the engineering design methods, a new design of the lifting and towing device has been proposed and evaluated. Ključne besede: intralogistics, material handling systems, automation and robotisation, planning and construction, lifting and towing mechanism, simulation and animation Objavljeno v DKUM: 15.03.2023; Ogledov: 679; Prenosov: 81
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6. Modeliranje in razvoj kode za analizo statičnega odziva geometrijsko nelinearnih ravninskih konstrukcij : magistrsko deloMarko Motaln, 2022, magistrsko delo Opis: V zaključnem delu obravnavamo statični odziv ravninskih konstrukcij s pomočjo metode končnih elementov. Za ravninsko napetostno stanje je izpeljan štirivozliščni izoparametrični končni element, ki ga uporabimo za razvoj lastne programske kode, s pomočjo katere lahko analiziramo linearne in nelinearne odzive konstrukcij. Najprej so teoretično predstavljene vse metode in količine, ki jih kasneje uporabimo pri razvoju algoritmov. Prav tako je predstavljeno teoretično ozadje nastanka nelinearnosti v numeričnih simulacijah. Osnovo za razvoj kode predstavlja formulacija linearnega odziva, ki je osnova za opis iteracijskih in inkrementalnih formulacij, s katerimi lahko opišemo različne nelinearnosti. Naloga torej predstavi celoten razvoj programa za analizo po metodi končnih elementov, s katerim je moč izvesti procesiranje in poprocesiranje linearnih in nelinearnih ravninskih analiz. Ključne besede: MKE, Abaqus, RNS, statični odziv, geometrijska nelinearnost, materialna nelinearnost, Lagrangeeva formulacija Objavljeno v DKUM: 19.08.2022; Ogledov: 773; Prenosov: 206
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7. Dizajniranje ročice glavne lopute na mali hidroelektrarni : diplomsko deloMarko Motaln, 2020, diplomsko delo Opis: Diplomsko delo prikazuje postopek iskanja optimalnega dizajna ročice, ki je nameščena na glavni loputi male hidroelektrarne. Dizajn nove ročice se išče na osnovi obstoječega mehanizma, ki trenutno služi odpiranju in zapiranju glavne lopute. Skozi nalogo se srečamo z raznimi metodami, kot sta metoda končnih elementov ter optimizacija topologije, s katerimi si pomagamo pri iskanju optimalne konstrukcijske rešitve. Metode so najprej predstavljene teoretično in kasneje aplicirane na konkretnem primeru. Ključne besede: MKE, CAD, ProTOp, optimizacija topologije, dizajniranje, Abaqus, MHE Objavljeno v DKUM: 08.09.2020; Ogledov: 1117; Prenosov: 201
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