Browsing by Author "Jerman, Boris"

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Citation - WoS: 12
Citation - Scopus: 10
Cost and performance comparison of tier-captive SBS/RS with a novel AVS/RS/ML
(Taylor and Francis Ltd., 2024) Banu Yetkin Yetkin Ekren; Tone Lerher; Melis Küçükyaşar; Boris Jerman; Yetkin Ekren, Banu; Jerman, Boris; Lerher, Tone; Küçükyaşar, Melis; Ekren, Banu Yetkin
This paper introduces a novel autonomous vehicle-based storage and retrieval system that utilizes movable lifts (AVS/RS/ML) proposed as an alternative to the tier-captive shuttle-based storage and retrieval system (SBS/RS). The newly proposed system aims to provide an affordable solution with highly utilised AGVs that can also perform operations out of warehouse. The performance of this novel system is compared with the equivalent tier-captive SBS/RS warehouse design where each shuttle is dedicated in a specific tier in that design. The comparison is based on the initial system investments costs throughput rates and average utilisation of lifts/MLs in the system. Collision prevention rules are also applied to AVS/RS/ML and its performance is tested through simulation. The results show that the tier-captive SBS/SR system becomes cost-efficient under high throughput rate requirements while the AVS/RS/ML technology is preferred for relatively moderate and low process rate requirements. The unit-cost per month performance metric of AVS/RS/ML is less sensitive to an increase in number of tiers in the system compared to the tier-captive SBS/RS case indicating that AVS/RS/ML may be promising for high-tier warehouse system designs. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 24
Citation - Scopus: 28
Simulation-Based Performance Analysis for a Novel AVS/RS Technology with Movable Lifts
(MDPI, 2021) Boris Jerman; Banu Yetkin Ekren; Melis Kucukyasar; Tone Lerher; Jerman, Boris; Kucukyasar, Melis; Lerher, Tone; Ekren, Banu Yetkin
This paper studies a novel autonomous vehicle-based storage and retrieval system (AVS/RS) design with movable lifts (AVS/RS/ML). In the proposed system there are aisle-captive lifts that are able to travel along the warehouse aisle to position themselves at the target column location. Those lifts can lift up/down the autonomous vehicles to/from the target storage compartment when they are in standstill. This novel design is proposed as an alternative to existing AVS/RSs to balance the resource utilizations as well as to provide an inexpensive solution with highly utilized autonomous vehicles (i.e. AGVs). As an initial work for this novel system two alternative operating designs under different racking configurations are experimented. We compare those two designs by their throughput rate performance metrics under the arrival rate scenarios with highly utilized AGVs (i.e. 95%). Besides we experiment with two warehouse capacity scenarios: 900 and 1800 storage compartments. The results show that designs with two separate I/O point locations provide a better throughput rate than designs with single I/O point location. Besides a decreased number of columns in the system improves the system's performance.