e-journal

Blocking Effects in Warehouse Systems With Autonomous Vehicles

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Autonomous vehicle-based storage and retrieval system (AVS/RS) offers considerable flexibility with respect to throughput capacity in the transfer of unit loads in high density storage areas. AVS/RS relies on autonomous vehicles to provide horizontal movement within a tier and uses lifts to provide vertical
movement between tiers. In these systems, vehicle blocking delays in the aisles and cross-aisles could significantly impact system throughput and transaction cycle times. In this research, protocols
are developed to address vehicle blocking, and a semi-open queueing network model is proposed to analyze system performance and evaluate design trade-offs. A decomposition-based method is used to solve the queueing network and quantify the effect of blocking. This model is adopted to analyze the effect of
varying tier configuration parameters such as number of storage locations, depth/width ratio, number of vehicles, and vehicle utilization on blocking delays. These insights are useful for design conceptualization using AVS/RS. Note to Practitioners—Autonomous vehicle-based storage and
retrieval (AVS/R) systems represent a promising technology to handle palletized unit loads in a warehouse. Due to potential flexibility offered by this technology, it is being investigated as
an alternative technology to traditional crane-based systems in many applications. However, analytical models are required to help develop design insights that will allow practitioners to design
efficient systems that satisfy throughput, cycle time and flexibility requirements of particular application. This paper develops efficient analytical models to evaluate system performance under
various configurations. A distinguishing aspect of this research is that it captures the effect of vehicle blocking on system performance. The results show that blocking effects could be significant
in many cases and provide design insights that would be useful in minimizing blocking effects and improving system performance. Index Terms—Automated storage/retrieval system (AS/RS), autonomous vehicles, autonomous vehicle-based storage and

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Informasi Detail

Judul Seri

IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING

No. Panggil

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Penerbit

: ., 2014

Deskripsi Fisik

IEEE TRANSACTIONS ON AUTOMATION SCIENCE AND ENGINEERING, VOL. 11, NO. 2, APRIL 2014

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

VOL. 11, NO. 2

Subjek

TEKNIK

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

Versi lain/terkait

Lampiran Berkas

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