Journal of Engineering, Project, and Production Management, 2015, 5(1), 48-58

Multi-Objectives Finite Capacity Scheduling of Make-and-Pack Production with Options to Adjust Processing Time

Sophea Horng¹ and Pisal Yenradee²

¹Master of Engineering Student, Logistics and Supply Chain Systems Engineering Program, School of Manufacturing Systems and Mechanical Engineering, Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, 12121, Thailand.  Email: horngsophea@yahoo.com

Production Management

Received January 27, 2014; received revision April 21, 2014; Accepted on May 7, 2014

Abstract: Make-and-pack production is characterized by two stages of production namely, “make-stage” and “pack-stage” where each stage consists of parallel processing units. In make-stage, raw materials are converted into final products by batch processing. Then, the final products are packed into containers in pack-stage. This paper develops finite capacity scheduling (FCS) system of make-and-pack production with multi-objectives and options to adjust processing time (OAPT). Multi-objectives including minimizations of total tardiness, total earliness, total flow time, and total processing costs are conflicting and a compromised solution is needed. Moreover, the processing time can be adjusted by adding some special chemicals. This paper proposes mixed-integer linear programming models to determine the compromised solution by using weighted average of satisfaction levels (WASL) of all objectives as performance measure. The proposed compromised solution method consists of three steps, (1) determining the best and worst values of each objective, (2) determining the initial compromised solution of all objectives when OAPT is not included in the model, and (3) determining the compromised solution with OAPT. The effect of chemical costs to the OAPT is evaluated. The results showed that the proposed FCS system offered a compromised solution between conflicting objectives. The compromised solution is relatively good but not the best for all objectives. The OAPT can improve the performance of the system and it is significantly affected by the chemical cost per unit. When the chemical cost per unit is reduced, the special chemical is used more to reduce processing time per batch and then the performance measure is more improved.

Keywords: Make-and-pack production, mixed-integer linear programming, multi-objectives, compromised solution, adjustable processing times.

Copyright © Journal of Engineering, Project, and Production Management (EPPM-Journal).

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 Unported License.

Requests for reprints and permissions at eppm.journal@gmail.com.

Citation: Horng, S. and Yenradee, P. (2015). Multi-Objectives Finite Capacity Scheduling of Make-and-Pack Production with Options to Adjust Processing Time. Journal of Engineering, Project, and Production Management, 5(1), 48-58.

DOI: 10.32738/JEPPM.201501.0006

Full text