rescheduling management system.pdf

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Journal of Scheduling 6: 39±62, 2003. # 2003 Kluwer Academic Publishers. Printed in the Netherlands. RESCHEDULING MANUFACTURING SYSTEMS: A FRAMEWORK OF STRATEGIES, POLICIES, AND METHODS GUILHERME E. VIEIRA 1 , JEFFREY W. HERRMANN 2, , AND EDWARD LIN 3 1 Department of Control and Industrial Automation Engineering, Catholic University of Parana, Curitiba, Parana, Brazil 2 Department of Mechanical Engineering and Institute for Systems Research, University of Maryland, College Park, MD 20742, USA 3 Institute for Systems Research, University of Maryland, College Park, MD 20742, USA ABSTRACT Many manufacturing facilities generate and update production schedules, which are plans that state when certain controllable activities (e.g., processing of jobs by resources) should take place. Production schedules help managers and supervisors coordinate activities to increase productivity and reduce operating costs. Because a manufacturing system is dynamic and unexpected events occur, rescheduling is necessary to update a production schedule when the state of the manufacturing system makes it infeasible. Rescheduling updates an existing production schedule in response to disruptions or other changes. Though many studies discuss rescheduling, there are no standard definitions or classification of the strategies, policies, and methods presented in the rescheduling literature. This paper presents definitions appropriate for most applications of rescheduling manufacturing systems and describes a framework for understanding rescheduling strategies, policies, and methods. This framework is based on a wide variety of experimental and practical approaches that have been described in the rescheduling literature. The paper also discusses studies that show how rescheduling affects the performance of a manufacturing system, and it concludes with a discussion of how understanding rescheduling can bring closer some aspects of scheduling theory and practice. KEY WORDS: rescheduling; predictive-reactive scheduling; dynamic scheduling 1. INTRODUCTION Many manufacturing facilities generate and update production schedules, which are plans that state when certain controllable activities (e.g., processing of jobs by resources) should take place. In dynamic, stochastic manufacturing environments, managers, production planners, and supervisors must not only generate high-quality schedules but also react quickly to unexpected events and revise schedules in a cost-effective manner. These events, generally difficult to take into consideration while generating a schedule, disturb the system, generating considerable differences between the predetermined schedule and its actual realization on the shop floor. *Correspondence to: Dr Jeffrey W. Herrmann, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742. E-mail: [email protected] Contract/grant sponsor: CAPES; Contract/grant number: 3135/95-3

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Page 1: Rescheduling management system.pdf

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Rescheduling environments

Static (finite set of jobs) Dynamic (infinite set of jobs)

Deterministic(all information given)

Stochastic(some information

uncertain)

No arrival variability

(cyclic production)

Arrival variability

(flow shop)

Process flow variability(job shop)

Rescheduling strategies

Dynamic (no schedule) Predictive-reactive (generate and update)

Dispatching rules Control-theoretic

Periodic Event-driven Hybrid

Rescheduling policies

Rescheduling methods

Schedule generation Schedule repair

Nominal schedules Robust schedules Right-shiftrescheduling

Partialrescheduling

Completeregeneration

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