Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Line side placement for shorter assembly line worker paths
Authors: Sedding, Helmut A.
DOI: 10.1080/24725854.2018.1508929
Published in: IISE Transactions
Volume(Issue): 52
Issue: 2
Pages: 181
Pages to: 198
Issue Date: Feb-2020
Publisher / Ed. Institution: Taylor & Francis
ISSN: 2472-5854
2472-5862
Language: English
Subjects: Assembly line; Line side placement; Walking time; Moving conveyor; Time-dependent scheduling
Subject (DDC): 658.5: Production management
Abstract: Placing material containers at moving assembly lines is an intriguing problem because each container position influences worker paths. This optimization is relevant in practice as worker walking time accounts for about 10–15% of total work time. Nonetheless, we find few computational approaches in the literature. We address this gap and model walking time to containers, then optimize their placement. Our findings suggest this reduces walking time of intuitive solutions by an average of 20%, with considerable estimated savings. To investigate the subject, we formulate a quintessential optimization model for basic sequential container placement along the line side. However, even this core problem turns out as strongly NP-complete. Nonetheless, it possesses several polynomial cases that allow to construct a lower bound on the walking time. Moreover, we discover exact and heuristic dominance conditions between partial placements. This facilitates an exact and a truncated branch-and-bound solution algorithm. In extensive tests, they consistently deliver superior performance compared to several mixed integer programming and metaheuristic approaches. To aid practitioners in quickly recognizing instances with high optimization potential even before performing a full optimization, we provide a criterion to estimate it with just few measurements.
URI: https://digitalcollection.zhaw.ch/handle/11475/18867
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Appears in collections:Publikationen School of Engineering

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