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Approximation algorithms for simple assembly line balancing problems

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Abstract

This work considers the three main optimization variants of the Simple Assembly Line Balancing problem (SALBP): SALBP-1, SALBP-2 and SALBP-E. These problems have origin in typical industrial production processes, where, to obtain a final product, partially ordered operations must be processed in workstations connected by a transportation equipment. Each version determines a different objective to be optimized: SALBP-1 focuses on minimizing the number of workstations while maintaining a certain production rate, SALBP-2 tries to maximize the production rate with a bounded number of workstations, and SALBP-E attempts to maximize the line efficiency. These problems are NP-hard and have been largely studied in the literature, however, the results on their approximability are scarce. This work approaches SALBP-1, SALBP-2 and SALBP-E, proving an equivalence on approximating in polynomial time SALBP-2 and a generalization of SALBP-E, and proposing very efficient polynomial time 2-approximation algorithms for each one of these three versions of SALBP.

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Notes

  1. In the Multiprocessor Scheduling problem, minimizing the completion time may be similar to minimizing the cycle time in SALBP-2, however, the precedence constraints of these problems enforce different conditions, implying that the problems are actually different. In SALBP-2 the precedence constraints prohibit to assign some operations to previous workstations, while in the Multiprocessor Scheduling problem, the precedence constraints obligate tasks to wait for the completion of the others, but the tasks can be scheduled at any processor.

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Correspondence to Santiago Valdés Ravelo.

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Ravelo, S.V. Approximation algorithms for simple assembly line balancing problems. J Comb Optim 43, 432–443 (2022). https://doi.org/10.1007/s10878-021-00778-2

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  • DOI: https://doi.org/10.1007/s10878-021-00778-2

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