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1.
Simulation model of multi-shuttle automated storage and retrieval systems
Iztok Potrč, Tone Lerher, Janez Kramberger, Matjaž Šraml, 2004, original scientific article

Abstract: Automated storage and retrieval systems (AS/RS) brought to industry the advantages of faster storages and retrieval of products, efficient utilizationof storage space, high reliability and better control inventory, improved safety and decrease in damages of products. Therefore AS/RS which areused in manufacturing, warehousing and distribution centers have to be designed to provide quick response for storages and retrievals of products in order to keep the system operating efficiently. Heuristics travel time models for AS/RS with equal-sized cells in height and randomized storage under single- and multi-shuttle system are presented in this paper. The main contribution of proposed model is the implementation of the "Strategy x" and determination of relationship between average travel times and throughput capacity for different types of high storage racks and velocity profiles of storage retrieval machine.
Keywords: transport systems, high storage rack, automated warehousing, discrete event simulation, storage location assignment policies
Published: 01.06.2012; Views: 1279; Downloads: 60
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2.
Multicriteria evaluation of high-speed rail, transrapid Maglev and Air passenger transport in Europe
Milan Janić, 2003, original scientific article

Abstract: This article deals with a multicriteria evaluation of High-Speed Rail, Transrapid Maglev and Air Passenger Transport in Europe. Operational, socio-economic and environmental performance indicators of the specific high-speed transport systems are adopted as the evaluation criteria. By using the entropy method, weights are assigned to particular criteria in order to indicate their relative importance in decision-making. The TOPSIS method is applied to carry out the multicriteria evaluation and selection of the preferable alternative (high-speed system) under given circumstances.
Keywords: high-speed transport systems, Europe, multicriteria analysis, entropy method, interest groups
Published: 05.06.2012; Views: 1445; Downloads: 73
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3.
Načrtovanje avtomatiziranih regalnih skladiščnih sistemov z uporabo simulacijskega postopka
Iztok Potrč, Tone Lerher, Janez Kramberger, Matjaž Šraml, 2004, original scientific article

Abstract: V prispevku je predstavljen simulacijski model avtomatiziranega regalnega skladiščnega sistema z enojno pomično in večpomičnimi mizami. Glavni namen predstavljene raziskave je določitev zmogljivosti sistema z večpomičnimi mizami, glede na sistem z enojno pomično mizo. Slednje pomeni glavni delež in pomoč pri postopku načrtovanja avtomatiziranega regalnega skladiščnega sistema. Povečanje pretočne zmogljivosti transportno-skladiščnih enot je mogoče z uporabo sistema z večpomičnimi mizami, glede na sistem z enojno-pomično mizo. V inženirski praksi se največkrat uporablja sistem z enojno pomično mizo, ki temelji na dvojnem delovnem krogu, medtem ko sistem z večpomičnimi mizami temelji na štirikratnem in šestkratnem delovnem krogu. Problem se pojavi pri uporabi ustrezne upravljalne strategije, za zagotovitev pogoja o najmanjših vožnjah regalnega dvigala. V ta namen smo uporabili posebno domiselno metodo, poimenovano "Strategija x", ki razvrsča zaporedje skladiščnih in odpremnih zahtev, z namenom po minimizaciji povprečnega časa vožnje regalnega dvigala. Za ovrednotenje domiselne metode s sistemom večpomičnih miz smo uporabili tehniko diskretnih numeričnih simulacij. Rezultati simulacijske analize so pokazali očitno povečanje pretočnih zmogljivosti sistema z večpomičnimi mizami v primerjavi s sistemom enojne pomične mize.
Keywords: transport systems, high storage racks, automated warehousing, discrete event simulation, storage operation, performance analysis
Published: 10.07.2015; Views: 684; Downloads: 21
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