Continuous-Time Modeling for Short-Term Scheduling of Multipurpose Pipeless Plants

Bok, Jin-Kwang; Park, Sunwon

doi:10.1021/ie9800703

Cited by 29 publications

(29 citation statements)

References 4 publications

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“…4. Research contributions following this direction include those presented by Pinto and Grossmann (1994, Pinto, Ttirkay, Bolio, and Grossmann (1998), Karimi and McDonald (1997), Lamba and Karimi (2002a,b), Bok and Park (1998), Moon and Hrymak (1999).…”

Section: Sequential Processesmentioning

confidence: 99%

Continuous-time versus discrete-time approaches for scheduling of chemical processes: a review

Floudas

Lin

2004

Computers & Chemical Engineering

593

378

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An overview of developments in the scheduling of multiproduct/multipurpose batch and continuous processes is presented. Existing approaches are classified based on the time representation and important characteristics of chemical processes that pose challenges to the scheduling problem are discussed. In contrast to the discrete-time approaches, various continuous-time models have been proposed in the literature and their strengths and limitations are examined. Computational studies and applications are presented. The important issues of incorporating scheduling at the design stage and scheduling under uncertainty are also reviewed.

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Section: Sequential Processesmentioning

confidence: 99%

Continuous-time versus discrete-time approaches for scheduling of chemical processes: a review

Floudas

Lin

2004

Computers & Chemical Engineering

593

378

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“…The scheduling problems were formulated mainly with the use of the mixed integer linear programming (MILP) [5]- [7]. However, the main weakness of the MILP approach is that, as the complexity of a system increases, the scheduling problem becomes very difficult to formulate properly [8].…”

Section: Motivationmentioning

confidence: 99%

Multirobot Coordination for Flexible Batch Manufacturing Systems Experiencing Bottlenecks

Hoshino

Seki

Naka

et al. 2010

IEEE Trans. Automat. Sci. Eng.

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In this paper, we focus on a batch manufacturing system with multiple industrial robots. In this system, material-handling robots (MHRs) and material-processing robots (MPRs) are operating. Since various operations are conducted at certain places, one of them might include a localized bottleneck. A localized bottleneck is a constraint that dominates the maximum amount of production in a system, that is, the productivity. In addition, the bottleneck induces congestion; as a result, the productivity declines. For these issues, there are two primary challenges: bottleneck prevention and restraint. To solve them, suitable operational techniques with respect to the MHRs and MPRs are needed in order for them to operate appropriately while relating to each other. In this paper, a constructive approach toward multi-robot coordination problems is taken. In this approach, we propose applicable operational techniques for the robots. Through simulation experiments, we examine the effectiveness of the proposed techniques and their combinations and, finally, show an integrated operational technique. Each of the operational techniques solves a localized bottleneck and the congestion, and the integrated technique successfully improves the productivity and results in the most efficient system.Note to Practitioners-The primary motivation for this study was the pursuit of answers to the problems associated with production operations for a pipeless batch plant system in chemical process industries. These solutions will also apply to other manufacturing systems for high-mix low-volume production with a number of machines or robots. In many previous studies, scientists addressed the optimization problem of production scheduling; in this study, however, we focus on a simulation study and aim to develop an applicable integration technology for the coordination of operating robots in the interest of the automation of a highly flexible production activity. In practical batch manufacturing systems, as an entire operational strategy, it is necessary to equalize the flow of products, i.e., bottlenecks, throughout the system. Furthermore, once a localized bottleneck appears, its harmful effect on the system has to be restrained. Therefore, we suggest efficient operational techniques to tackle these challenging issues. Through various simulation experiments, we show that some good combinatorial techniques enable to improve productivity. The results of this paper are feasible and sufficient for flexible batch manufacturing systems, but the application is limited to a system in which the safety of production operations and processes is guaranteed. In future research, we will address design problems regarding safety and reliability in a plant system.

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“…The scheduling problem has been formulated mainly with the use of the Mixed Integer Linear Programming, MILP [3] [4] [5]. However, a main weakness of the MILP approach is that, as the complexity of a plant increases, the scheduling problem becomes very hard to formulate properly [6].…”

Section: Previous and Related Workmentioning

confidence: 99%

Integrated operational techniques for efficient robotic batch manufacturing systems

Hoshino

Seki

Naka

et al. 2009

2009 IEEE International Symposium on Assembly and Manufacturing

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Abstract-This paper focuses on a batch manufacturing system with multiple industrial robots. In this system, material-handling robots (MHRs) and material-processing robots (MPRs) are operating. Inappropriate operations of these robots might cause a bottleneck. In addition, a bottleneck is a constraint that dominates the entire system performance, that is, the productivity. Therefore, for an efficient system, these robots have to operate appropriately while relating to each other. This is a challenge in this study. We propose the following operational techniques: route planning approaches for the MHR and operation dispatching rules for the MPR on the basis of task-assignment to the robots that will reduce the effect of a bottleneck. Furthermore, reactive cooperation among the MPRs, so that the robots respond to a fluctuating heavy workload caused by the shifting bottleneck, is an essential operational technique. Throughout the simulation experiments, each combination of the operational techniques is examined; finally, the integrated operational techniques are shown.

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Continuous-Time Modeling for Short-Term Scheduling of Multipurpose Pipeless Plants

Cited by 29 publications

References 4 publications

Continuous-time versus discrete-time approaches for scheduling of chemical processes: a review

Continuous-time versus discrete-time approaches for scheduling of chemical processes: a review

Multirobot Coordination for Flexible Batch Manufacturing Systems Experiencing Bottlenecks

Integrated operational techniques for efficient robotic batch manufacturing systems

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