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ISSN:2222-7059 (Print);EISSN: 2222-7067 (Online)
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Title : Lot Size Formulation Minimizing Makespan with Transactional and Movement Times
Author(s) : Lanndon Ocampo, Eppie Clark, Alaine Liggayu
Author affiliation : 1 Department of Industrial Engineering, De La Salle University, 2401 Taft Avenue, 1004 Manila, Philippines
2 Department of Industrial Engineering, University of San Carlos, Cebu City, 6000 Cebu, Philippines
Corresponding author img Corresponding author at : Corresponding author img  

This paper proposes a lot size formulation with the objective of minimizing manufacturing makespan. A simple manufacturing system is considered with single product that is processed through pre-defined task sequence of known tasks, transactional and material handling times. The lot size problem yields a nonlinear optimization model whose solution satisfies the Kuhn-Tucker necessary and sufficient conditions. Results show that lot size is a function of the demand, the transactional activities and the length of the material handling times at the constraint task, and the sum of unconstrained task times. When transactional and material-handling times are considered, optimal lot size is independent of the longest task time but dependent on the sum of the processing times of the unconstrained tasks. The main contribution of this paper is the proposed method of minimizing makespan without spending resources in improving the constraint task but instead, considers developing an optimal lot size. This paper poses relevant applications especially for high-volume manufacturing systems.

Key words:lot size; nonlinear optimization; makespan

Cite it:
Lanndon Ocampo, Eppie Clark, Alaine Liggayu, Lot Size Formulation Minimizing Makespan with Transactional and Movement Times, Advances in Industrial Engineering and Management, Vol.3, No.2, 2014, pp.13-18, doi: 10.7508/AIEM-V3-N2-13-18

Full Text : PDF(size: 2.16 MB, pp.13-18, Download times:1135)

DOI : 10.7508/AIEM-V3-N2-13-18

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