Abstract
Workload control mechanisms are widely studied in the literature for the control of job-shop systems. The control of these systems involves acceptance, order release and priority dispatching. At the release level, the workload norm controls the “enters” of the jobs; it is relevant how the aggregate workload is computed. Few works have studied new computation methods of the aggregate workload but use the adjusted aggregate workload proposed in the literature. This paper proposes a dynamically adjusted aggregate workload to improve the performance of the workload control mechanism in job-shop systems. The adjusted aggregate workload is updated when each part exits from a workstation; this means that the workload used to release the orders is related to the state of the job shop in real-time. Simulation is used to evaluate and compare the proposed model to the classical models proposed in the literature. The simulation experiments demonstrate improvement of performance and how the model proposed is robust under different manufacturing system conditions.
Highlights
Workload control (WLC) approaches are widely used in the case of small and medium enterprises with make to order (MTO) production systems
The WLC is an order release mechanism for controlling work in process (WIP) and flow time using a pre-shop pool where the jobs wait until the conditions to enter are verified
This study evaluates a modified computation of the workload, considering the dynamic adjusted workload aggregate computation by Oosterman et al [11], and other studies on this issue adjustment of the workload that can use the development of Internet of things (IoT) technologies
Summary
Workload control (WLC) approaches are widely used in the case of small and medium enterprises with make to order (MTO) production systems. The input of a new order is allowable, considering the workload limits of the workstations (norm limit) This allows maintaining an optimal level of WIP, reducing the shop floor flow time and queue lengths in front of the work centers. The first decision is the release decision of the orders that wait in the pre-shop pool of the manufacturing system [7]: the approaches proposed in the literature are periodic and continuous. The research proposed in this paper concerns the study of a job shop under a continuous workload control method. The main focus of the research concerns the computation of the aggregate workload of the manufacturing system used to define the norm level for the release of jobs.
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