TY - GEN
T1 - Petri net-based cycle time analysis of dual-arm cluster tools with wafer revisiting and swapping strategy
AU - Wu, Naiqi
AU - Chu, Feng
AU - Chu, Chengbin
AU - Zhou, Mengchu
PY - 2011
Y1 - 2011
N2 - There are wafer fabrication processes in cluster tools that require revisiting. It is shown that swapping is efficient in operating a dual-arm cluster tool. For dual-arm cluster tools with wafer revisiting, if a swap strategy is applied, it forms a three wafer periodical process with three wafers completed in each period. Such a period contains three cycles in a revisiting process and another three cycles in non-revisiting process. Hence, analysis and scheduling of dual-arm cluster tools with wafer revisiting become very complicated. In this work, a Petri net model is developed to describe the operations of such tools. Based on it, it is found that if a swap strategy is applied to a dual-arm cluster tool with wafer revisiting, it is always in a transient state. A systematic method is presented to analyze its performance.
AB - There are wafer fabrication processes in cluster tools that require revisiting. It is shown that swapping is efficient in operating a dual-arm cluster tool. For dual-arm cluster tools with wafer revisiting, if a swap strategy is applied, it forms a three wafer periodical process with three wafers completed in each period. Such a period contains three cycles in a revisiting process and another three cycles in non-revisiting process. Hence, analysis and scheduling of dual-arm cluster tools with wafer revisiting become very complicated. In this work, a Petri net model is developed to describe the operations of such tools. Based on it, it is found that if a swap strategy is applied to a dual-arm cluster tool with wafer revisiting, it is always in a transient state. A systematic method is presented to analyze its performance.
UR - http://www.scopus.com/inward/record.url?scp=82455167620&partnerID=8YFLogxK
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U2 - 10.1109/ICRA.2011.5980119
DO - 10.1109/ICRA.2011.5980119
M3 - Conference contribution
AN - SCOPUS:82455167620
SN - 9781612843865
T3 - Proceedings - IEEE International Conference on Robotics and Automation
SP - 5499
EP - 5504
BT - 2011 IEEE International Conference on Robotics and Automation, ICRA 2011
T2 - 2011 IEEE International Conference on Robotics and Automation, ICRA 2011
Y2 - 9 May 2011 through 13 May 2011
ER -