Analysis of Downtime Transient Impact for Energy Efficient Manufacturing Systems

In this paper, we investigate how a scheduled downtime would affect the manufacturing system throughput. The impact of a scheduled downtime on manufacturing system future behavior is analyzed based on the system physical constraints. We proposed the concept of downtime recovery time to describe the characteristics of this downtime future production impact, and to identify the future time span within which the system production will be affected by the scheduled downtime. In addition, evaluation methods are developed to predict the downtime production impact in both deterministic and stochastic scenarios. The evaluation results can be utilized in the design of production control policies to strategically schedule downtime actions to effectively improve system energy efficiency while achieving a desirable productivity.