1. Towards productive and ergonomic order picking : multi-objective modeling approachBrigita Gajšek, Simona Šinko, Tomaž Kramberger, Marcin Butlewski, Eren Özceylan, Goran Đukić, 2021, original scientific article Abstract: The logistics sector should strive for sustainability alongside productivity by protecting its order pickers' health and welfare. Existing storage assignment models are mainly based on the criterion of order picking time and, to a lesser extent, the human factor. In the paper, a solution to a storage assignment problem using a multi-objective model based on binary integer linear programing is presented by developing a solution that considers order picking time, energy expenditure and health risk. The Ovako Working Posture Assessment System (OWAS) method was used for health risk assessment. The downside of solely health risk-optimization is that the average order picking time increases by approximately 33 % compared to solely time-optimization. Contrary to this, the developed multi-objective function emphasizing time has proven to be promising in finding a compromise between the optimal order picking time and eliminating work situations with a very-high risk for injuries. Its use increases the time by only 3.8 % compared to solely time-optimization while significantly reducing health risk.
Keywords: productivity, energy expenditure, order picking, order picking system, health risk, OWAS, multi-objective modeling, planning, logistics, ergonomics
Published in DKUM: 13.08.2024; Views: 109; Downloads: 11
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2. Single-tray VLM vs dual-tray VLM : quantitative throughput comparisonGoran Đukić, Tihomir Opetuk, Brigita Gajšek, Tone Lerher, 2021, original scientific article Abstract: In this paper quantitative comparison of resulting throughputs for single-tray and dual-tray VLM devices is presented. Comparison is based on mathematical models for throughput approximating dual command times of VLM's crane, for selected parameters of VLM device (height and crane's velocity) and selected picking times per delivered tray. Analysis showed that throughput increase achieved by using dual-tray VLM's depends mostly on the average picking time relative to the expected dual command time of the VLM's crane. Highest improvements are possible for picking time equal to expected dual command time and amounts over 80%, however for extremely low or high picking times improvements are significantly reduced.
Keywords: order-picking, throughput model, vertical lift module systems, quantitative analysis, intralogistics, dual-tray VLM, single-tray VLM
Published in DKUM: 12.08.2024; Views: 48; Downloads: 9
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3. Bi-objective assignment model for lean order picking in a warehouseBrigita Gajšek, Hrvoje Cajner, Tihomir Opetuk, Goran Đukić, Marcin Butlewski, 2022, original scientific article Abstract: With the introduction of Lean Warehousing, we are committed to using lean principles for more efficient warehousing operations, which are performed with quality and safety. Manual order picking, on which the paper is focused, is currently considered the most unfriendly to humans because, in the long run, it contributes to the appearance of musculoskeletal disorders. We record not only the increase in the average age of employees in warehouses but also in the number and duration of sick leave due to back and muscle pain. This paper explores the possibility of productive work while preventing order pickers from Work-Related Musculoskeletal Disorders. Using a laboratory experiment, we determine retrieval times for units with different characteristics and study required postures by guidelines of Revised NIOSH Lifting Equation. The final goal is to create a bi-objective assignment model.
Keywords: warehousing, order picking, ergonomics, intralogistics, lean logistics, manual order picking, productivity, revised NIOSH lifting equation, warehousing, work-related musculoskeletal disorders
Published in DKUM: 13.06.2024; Views: 105; Downloads: 8
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4. An optimisation model for minimising totes exchange in VLM and SBS/RS integrated systemJakob Marolt, Goran Đukić, Fabio Sgarbossa, Tone Lerher, 2022, published scientific conference contribution Abstract: Warehouses and distribution centres are based on integrated material handling solutions. Most of the research papers in intralogistics are only concerned with one system to analyse and optimise the addressed system's performance, such as maximum throughput performance, minimum total cost, maximum energy efficiency, etc. This paper presents a concept to justify the proposed VLM and SBS/RS integrated system and a binary integer programming (BIP) model that minimises totes exchange between the two storage systems. The results show that the minimal number of exchanges between VLM and SBS/RS was achieved in a case study with a longer order list (T = 1600) and a highly dependent SKU's Pareto relationship (20-50).
Keywords: automated warehousing, intralogistics, VLM, SBS, RS, integrated systemoptimisation, performance analysis
Published in DKUM: 02.08.2023; Views: 390; Downloads: 59
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5. Avtomatska vozila in mobilni roboti v intralogistikiTone Lerher, 2022 Abstract: Učbenik obravnava avtomatizacijo in robotizacijo notranjega transporta v intralogistiki, kjer so navedena avtomatsko vodena vozila AGV in avtonomni mobilni roboti AMR. Poleg tehnično-tehnoloških karakteristik AGV in AMR so predstavljene posamezne izvedbe AGV in AMR, ki se uporabljajo širse v logistiki. V učbeniku so posebej obravnavani avtomatski vozički za delo v avtomatiziranih regalnih skladiščnih sistemih in avtonomni mobilni roboti za delovanje v skladiščih prihodnosti. Navedeni so temeljni analitični in numerični modeli za določitev pretočne zmogljivosti AGV in AMR v skladiščnih sistemih. Poleg ze ustaljenih rešitev AGV in AMR v skladiščih v praksi so predstavljeni novi idejni koncepti avtomatiziranih in robotiziranih transportno-skladiščnih sistemov AGV in AMR, ki so trenutno se v fazi koncipiranja in nadaljnjega razvoja.
Keywords: lntralogistika, skladišča, avtomatizacija in robotizacija, AGV in AMR, idejni koncepti AGV in AMR
Published in DKUM: 26.04.2022; Views: 1376; Downloads: 186
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6. Skladiščno-komisionirni sistemiTone Lerher, 2021 Abstract: Učbenik obravnava skladiščno-komisionirne sisteme v intralogistiki, kjer so navedeni temeljni skladiščni procesi. Najbolj delovno intenzivni in zahtevni proces v skladiščih predstavlja proces komisioniranja, ki se še vedno najpogosteje izvaja ročno ali samo delno avtomatizirano. Procesu komisioniranja v literaturi in v praksi namenjamo največ pozornosti z vidika vpeljave učinkovitih komisionirnih metod in strategij ter avtomatiziranih in robotiziranih tehnologij pri zagotavljanju procesa komisioniranja paletiziranega blaga, kartonov ali posameznih artiklov. V učbeniku so posebej obravnavani avtomatizirani regalni skladiščni sistemi in analitični modeli za določitev manipulacijskega časa enojnega in dvojnega delovnega cikla ter pretočne zmogljivosti skladišča.
Keywords: intralogistika, skladišča, komisionirne metode in strategije, skladiščne tehnike in tehnologije, avtomatizirani skladiščni sistemi
Published in DKUM: 11.10.2021; Views: 927; Downloads: 90
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7. Inovativen koncept naslona za roke pri zadnjih avtomobilskih sedežihGoran Đukić, 2012, undergraduate thesis Abstract: Nasloni za roke pri zadnjih avtomobilskih sedežih predstavljajo način sprostitve mišic in hrbtenice pri sedenju v avtomobilu. Uporabniku nudijo oporo ter možnost spreminjanja položajev med vožnjo. V diplomski nalogi smo opisali ergonomske in biomehanske dejavnike, ki so ključnega pomena za optimalno oblikovanje naslona za roke. S pomočjo ankete smo raziskali mnenja uporabnikov naslonov, z metodo opazovanja smo ugotovili aktivnost določenih mišic pri opravljanju različnih del med vožnjo na zadnjih sedežih, preučili pa smo tudi že obstoječe rešitve naslonov.
Rezultat diplomske naloge je inovativna zasnova naslona za roke, ki je ergonomsko in biomehansko dovršen ter tako prijazen širokemu spektru uporabnikov.
Keywords: ergonomija, biomehanika, pravilno sedenje, hrbtenica, ročna podpora, naslon za roke
Published in DKUM: 13.07.2012; Views: 2255; Downloads: 113
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