On-line knowledge-based simulation for FMS

Gonzalez, Lissette R.; Garcia, Marelys L.; Centeno, Martha A.

doi:10.1145/256562.256904

Cited by 3 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If not, online simulation is used to select the best control policy among candidate control policies Banks, 1991, 1992;Tayanithi et al, 1992Tayanithi et al, , 1993. Gonzalez et al (1996) reviewed the literature on the online knowledge-based simulation for FMS. They stated that the determination of frequency of data collection is important for the overall system performance because a large database causes a negative effect in the response time.…”

Section: Discussionmentioning

confidence: 99%

Simulation-based real-time decision making for manufacturing automation systems: a review

Yoon¹,

Shen²

2006

IJMTM

View full text Add to dashboard Cite

As computing power increases, many researchers have addressed online discrete event simulation approaches for real-time decision making in manufacturing shop floors. They typically use real data received from monitoring systems in a shop floor to support real-time decision making, and then the results are transmitted to the shop floor through an execution system. The online discrete event simulation is used to evaluate various 'what-if' scenarios and to predict the behaviours of the shop floor. This paper presents a state-of-the-art review of the researches and developments on real-time decision making based on online discrete event simulations. To provide a comprehensive review, the various approaches proposed and developed in the literature are classified into four categories: general approaches, artificial intelligence-based approaches, distributed systems approaches and virtual manufacturing and/or virtual factory approaches. Finally, future research challenges and opportunities are identified.

show abstract

Section: Discussionmentioning

confidence: 99%

Simulation-based real-time decision making for manufacturing automation systems: a review

Yoon¹,

Shen²

2006

IJMTM

View full text Add to dashboard Cite

show abstract

“…Hybrid systems are receiving greater attention from researchers because of their comprehensive nature. Gonzalez (1995) reviewed the various ways in which on-line knowledgebased simulation for FMS has been approached.…”

Section: Introductionmentioning

confidence: 99%

Real-time scheduling with deadlock avoidance in flexible manufacturing systems

ElMekkawy

ElMaraghy

2003

The International Journal of Advanced Manufacturing Technology

View full text Add to dashboard Cite

The dynamic nature of manufacturing makes rescheduling essential in today's complex production environment, particularly in flexible and re-configurable systems. Research on optimising schedules, which includes deadlock avoidance, is rather limited. Furthermore, the deadlock problem is mostly ignored in research on rescheduling. A rescheduling algorithm, that uses time petri-nets and the minimal siphons concept, was developed to deal with sources of disturbance such as machine breakdowns in real-time. The algorithm guarantees a deadlock-free new schedule. The existence of alternative routes, availability of material handling facilities and the limitation of buffer capacities were taken into consideration. The developed algorithm modifies only the affected portion of the original schedule, rather than rescheduling all jobs, in order to limit changes to the original schedule and reduce the impact on the response time.The effect of flexible routing, machine breakdowns, machine downtime, routing criterion and the use of the dispatching rule on the performance of manufacturing systems was studied. The systems performance was measured by the average flow time, the makespan and the average machine utilisation. The results indicate that utilising the system routing flexibility in real-time rescheduling, while avoiding deadlocks, improves system performance. Moreover, routing the interrupted operation to an alternative machine, based on the minimum expected completion time rather than the least utilised machine criterion, resulted in better performance.

show abstract