A Selective Maintenance Decision Method for Phased-Mission Systems Considering the Consequences of Failures

Owing to the hierarchical configuration, mission phasing, and diverse failure modes inherent in phased-mission systems (PMS), the consequences of failures occurring during mission execution exhibit considerable variability. This paper addresses the complexities of maintenance decision-making arising from mission requirements and the differentiated consequences of failures under constrained maintenance resources. A selective maintenance decision method that incorporates failure consequence considerations is proposed. Initially, a novel severity index for failure consequences is developed, encompassing four dimensions: safety, environmental impact, usability, and economic factors, thereby facilitating precise quantification of failure impacts. Subsequently, a selective maintenance decision model is formulated based on the system's current state, integrating constraints such as mission cycles within each phase, maintenance opportunity windows, resource limitations, and the severity hierarchy of failure consequences. The primary objective is to optimize the mission reliability of PMS, thus informing the system maintenance strategy. Finally, a numerical case study is conducted to validate the feasibility and efficacy of the proposed approach.

Keywords: Selective maintenance, phased-mission system, failure consequence, mission reliability.