A batch scheduling and operator assignment model with time-changing effects to minimise total actual flow time. (18th November 2022)

• Record Type: Journal Article
• Authors: Kurniawan, Dwi; Cakravastia, Andi; Suprayogi, Suprayogi; Halim, Abdul Hakim
• Is Part Of: International journal of manufacturing research. Volume 17:Number 4(2022)
• Page Start: 422
• Page End: 451
• Publication Date: 2022-11-18
• Subjects: batch scheduling -- operator assignment -- learning-forgetting -- fatigue-recovery -- actual flow time; Manufacturing processes -- Periodicals; Manufacturing processes -- Automation -- Periodicals; Production engineering -- Periodicals; Factory management -- Periodicals; 670.5
• Languages: English
• ISSNs: 1750-0591

Abstract

This paper investigates integrated problems of batch scheduling and operator assignment with time-changing effects due to the operators experiencing different degrees of learning and forgetting, and accumulating different degrees of fatigue. Each batch will be processed through a number of operations in a flow shop, where each operation can be performed by one of the alternative operators. Each operator will be assigned to a maximum of one machine, and a minimum of one operator will be assigned to each machine. The production process could produce a number of defective products that can be reworked. The problems are formulated in a model, and the decision variables are operators' assignment to machines, the number of batches, batch sizes, items allocation to batches, and the schedule of the resulting batches. A proposed algorithm is developed to solve the model, and numerical examples show that the model and the algorithm work effectively for the investigated problem. [Submitted 30 January 2020; Accepted 15 January 2021]