Maintenance of a deteriorating control system based upon controller reconfiguration
Proceedings of ESREL'2015 . ETH Zurich
Safety and Reliability of Complex Engineered Systems
Podofillini et al. (Eds) © 2015 Taylor & Francis Group, London
In this paper, a modeling framework of a degrading control system is proposed with a focus on actuator deterioration. An actuator is costly and is the physical link between the control action and the governed process. For these reasons, it is a critical component. It is assumed a relationship between the controller setting and the actuator deterioration process. Moreover, as the degradation level increases, the actuator has more and more difficulties implementing the control action. The prognosis of the remaining useful lifetime of an actuator is then derived. Finally, a condition-based maintenance policy is proposed including the possibility to reconfigure the controller setting in order to be less stressful for the actuator. The impact of this additional action on the maintenance cost as well as on the system performances is assessed for several controller settings.