Simulation-Based Online Scheduling in a Make-to-Order Job Shop

Abstract

Scheduling is a core activity in the manufacturing business. It assists with the efficient and effective utilisation of capital-intensive resources and increased throughput, thus increasing profitability. Simulation is appealing in manufacturing, as it can realistically imitate dynamic, stochastic processes while being descriptive in predicting the future process. We combined simulation and scheduling and developed an online simulation-based scheduler for manufacturing orders in a South African make-to-order job shop enterprise. There are frequent changes in this type of environment, including random arrivals of orders with stochastic processing times. A simulation-based scheduler is applicable in this myopic, stochastic environment, and we demonstrate its use under these conditions. OPSOMMINGSkedulering is 'n kern-aktiwiteit in 'n vervaardigingsonderneming. Dit ondersteun doeltreffende en effektiewe benutting van kapitaal-intensiewe hulpbronne asook verhoogde produksiedeurset, wat weer wins verhoog. Simulasie is van nut in vervaardiging omdat dit dinamiese, stogastiese prosesse realisties kan naboots terwyl dit die prosestoekoms op beskrywende wyse toon. Simulasie en skedulering is gekombineer in hierdie projek om 'n simulasiegebaseerde skeduleerder te ontwikkel vir bestellings in 'n maak-op-aanvraag werkwinkel. Veranderings vind gereeld in hierdie tipe omgewing plaas, en sluit toevallige aankomste van bestellings met stogastiese prosestye in. 'n Simulasiegebaseerde skeduleerder is toepaslik in hierdie stogastiese, korttermyn-omgewing, en die werking van die skeduleerder word in hierdie omstandighede gedemonstreer.

Scheduling Customized Orders by Considering the Ergonomic Constraints: A Case Study at YEMTAR Company

“…In the labor intensive project type manufacturing; except a few similar orders produced frequently; there are unlimited types of different orders varying based on the technical specifications demanded by the customers and the state of the shop floor is changed continuously. This variation causes unknown processing times for each type of order which makes order scheduling harder [1][2][3][4][5].…”

Scheduling Customized Orders: A Case Study at BEST Transformers Company

“…In online scheduling, worker assignments to the tasks and allocation of the machines to the jobs are random and vary based on the order properties, status of the machines, machining capabilities, etc. [5].…”