An analysis of dual-command operations in common warehouse designs

Pohl, Letitia M.; Meller, Russell D.; Gue, Kevin R.

doi:10.1016/j.tre.2008.09.010

Cited by 59 publications

(36 citation statements)

References 16 publications

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“…This result is consistent with research on optimal shapes for single-command travel in traditional warehouses [2,4,13], and with the results of Gue and Meller [6,7].…”

Section: Esupporting

confidence: 91%

“…There are several articles that model dual-command travel in Layout A such as Mayer [11] and Malmborg and Krishnakumar [9,10], but they do not use their results to optimize warehouse design parameters, such as number and length of aisles. Pohl et al [13] develop analytical expressions for single-command and dual-command travel in Layouts A, B, and C. They derive equations to determine the number of aisles that minimizes dual-command travel in each layout. We use these travel models to describe the traditional warehouse performance that is compared with the performance of fishbone warehouses.…”

Section: Previous Researchmentioning

confidence: 99%

“…For example, the reserve area of a distribution center may be used to receive and store pallets until they are needed to replenish a fast-pick area, when they are then "shipped" to another part of the warehouse [1]. As discussed in [13], import warehouses play a critical role in today's global economy, which suggests a renewed investigation into unit-load warehouse design.…”

Section: Introductionmentioning

confidence: 99%

“…However, when more than one location is visited in a single tour, the addition of a cross aisle creates more possible routes for travel between locations and therefore has the potential to reduce expected travel [15]. For single-command travel, Layouts A and C are preferred, whereas Layouts B and C are generally preferred for dual-command travel [13]. In fact, Pohl et al [13] show that when the number of aisles in Layouts B and C is chosen to minimize expected dual-command travel, their performance is very similar and both layouts require the same amount of aisle space.…”

Section: Introductionmentioning

confidence: 99%

“…For single-command travel, Layouts A and C are preferred, whereas Layouts B and C are generally preferred for dual-command travel [13]. In fact, Pohl et al [13] show that when the number of aisles in Layouts B and C is chosen to minimize expected dual-command travel, their performance is very similar and both layouts require the same amount of aisle space.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing fishbone aisles for dual‐command operations in a warehouse

Pohl

Meller

Gue

2009

Naval Research Logistics

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Unit-load warehouses store and retrieve unit-loads, typically pallets. When storage and retrieval operations are not coordinated, travel is from a pickup and deposit (P&D) point to a pallet location and back again. In some facilities, workers interleave storage and retrieval operations to form a dual-command cycle. Two new aisle designs proposed by Gue and Meller ("Improving the unit-load warehouse." In Progress in Material Handling Research: 2006. Material Handling Industry of America, Charlotte, NC, 2006) use diagonal aisles to reduce the travel distance to a single pallet location by approximately 10 and 20% for the two designs, respectively. We develop analytical expressions for travel between pallet locations for one of these-the fishbone design. We then compare fishbone warehouses that have been optimized for dual-command to traditional warehouses that have been optimized in the same manner, and show that an optimal fishbone design reduces dual-command travel by 10-15%.

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“…This result is consistent with research on optimal shapes for single-command travel in traditional warehouses [2,4,13], and with the results of Gue and Meller [6,7].…”

Section: Esupporting

confidence: 91%

Section: Previous Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing fishbone aisles for dual‐command operations in a warehouse

Pohl

Meller

Gue

2009

Naval Research Logistics

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A novel approach for modeling order picking paths

Ozden

Smith

Gue

2020

Naval Research Logistics

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We introduce the visibility graph as an alternative way to estimate the length of a route traveled by order pickers in a warehouse. Heretofore it has been assumed that workers travel along a network of travel paths corresponding to centers of aisles, including along the right angles formed where picking aisles join cross aisles. A visibility graph forms travel paths that correspond to more direct and, we believe, more appropriate "travel by sight." We compare distance estimations of the visibility graph and the aisle-centers method analytically for a common traditional warehouse design. We conduct a range of computational experiments for both traditional and fishbone warehouse layouts to assess the impact of this change in distance metric. Distance estimations using aisle-centers calculates a length of a picking tour on average 10-20% longer compared to distance estimations based on the visibility graph. The visibility graph metric also has implications for warehouse design: when comparing three traditional layouts, the distance model using a visibility graph resulted in choosing a different best layout in 13.3% of the cases.

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Warehouse Layouts

Đukić¹,

Opetuk²

2012

Warehousing in the Global Supply Chain

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An analysis of dual-command operations in common warehouse designs

Cited by 59 publications

References 16 publications

Optimizing fishbone aisles for dual‐command operations in a warehouse

Optimizing fishbone aisles for dual‐command operations in a warehouse

A novel approach for modeling order picking paths

Warehouse Layouts

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