Measuring Resilience: A New Perspective on Assessing Production Facilities Through an OEE Based Resilience Metric

Abstract Measuring the resilience of industrial production facilities during the production is very complex due to the variety of possible influences and interactions. In addition, production systems are characterized by a dynamic environment with increasing adjustments and changes. A metric for measuring the resilience of individual production facilities during usage phase is intended to help overcome these challenges while meeting requirements such as applicability and comparability. The objective of the metric focuses on the evaluation of measures to remedy resilience relevant events. For this purpose, classified events are considered as a total quantity of changes, adjustments and disruptions together with the measures taken, each in isolation with regard to the productivity of a production facility. An adapted OEE approach with the three weighted influencing factors of quality, performance and availability is developed as the basis for evaluating productivity. This approach evaluates quality based on the direct and indirect costs incurred for rework and post-production. Performance is determined by the cycle time of the facility. The time share of value-adding processes in the period under review is evaluated as a measure of availability. Including the time parameter, which is recorded alongside the resilience event, the metric results in a comparable resilience value. By classifying the event in terms of speed of occurrence and degree of awareness, it is possible to derive the characteristics of adaptability, innovation capability, robustness and improvisation capability of a production facility. In addition, the resilience value determined enables further analysis and the application of resilience strategies.