Resilience allocation for resilient engineered system design

Most engineered systems are designed with high levels of system redundancies to satisfy required reliability requirementsunder adverse events, resulting in high systems' LCCs (Life-Cycle Costs). Recent years have seen a surge of interest and tremendousadvance in PHM (Prognostics and Health Management) methods that detect, diagnose, and predict the effects of adverse events. ThePHM methods enable proactive maintenance decisions, giving rise to adaptive reliability. In this paper, we present a RAP (ResilienceAllocation Problem) whose goal is to allocate reliability and PHM efficiency to components in an engineering context. The optimallyallocated reliability and PHM efficiency levels serve as the design specifications for the system RBDO (Reliability-Based DesignOptimization) and the system PHM design, which can be used to derive the detailed design of components and PHM units. The RAPis demonstrated using a simplified aircraft control actuator design problem resulting in a highly resilient actuator with optimallyallocated reliability, PHM efficiency and redundancy for the given parameter settings.