Selective Maintenance Decision For Phased Mission Systems Considering Multiple Failure Modes

With the severe operational environment and the development of science and technology,the missions,structures,and working environments of large-scale weapon systems are becoming increasingly complex.These types of systems are generally referred to as PhasedMission Systems(PMSs).For example,aviation security systems,satellite attitude and orbit control systems,and cruise missile systems,they are all typical PMSs.PMS has the characteristics of multiple failure modes,dynamic structure,and dynamic degradation,which poses great challenges to the reliability evaluation and selective maintenance of PMS.Therefore,this paper considers the multiple failure modes and their correlations of components to study the reliability evaluation and selective maintenance of PMS.The main research content includes:(1)Reliability evaluation for PMS considering multiple failure modes.The system configuration and working conditions of PMS are complex,and its components often have multiple failure modes that are interrelated.On the one hand,taking multiple correlated failure modes into consideration can describe the multistate characteristics of the system more accurately and decouple the correlation between different phases of the system more clearly.On the other hand,its complexity makes the reliability evaluation of PMS more difficult.this paper discusses the modeling method of multiple failure modes and their correlation,proposes an improved combination method of Multiple Failure Mode Tree(MFMT)and Multistate and Multivalued Decision Diagram(MMDD)model,and realizes the reliability evaluation of PMS in cross-level(failure mode-component-system)and cross-scale(single phase-multiple phases).(2)Selective maintenance decision for PMS considering repair-based structural importance measure(RSIM).Dynamic structures and degradation process of PMS bring new challenges to the existing selective maintenance.This paper proposes a selective maintenance decision-making method based on importance measure for the limited maintenance resources.First,a multi-state structural importance(MSI)is defined,which analyzes the role of components in the system structure to evaluate its impact on system state.Then,a repair-based structural importance measure(RSIM)is innovatively proposed.It takes into account the influence of the current reliability,maintainability and structural attributes of components on the system.Aim to dynamically identify key components,determine their maintenance sequence and degree during the mission intervals.Finally,a new selective maintenance optimization model was established with the reliability of the next phase considering multiple failure modes as the objective function,with RSIM importance and maintenance resources for constraints.(3)Reliability evaluation and selective maintenance for aviation support systems(ASS)considering multiple failure modes.Taking ASS as an engineering example,analyze the multiple failure modes and their correlations of components at different phases through the function and configuration of it,mission reliability for the ASS is evaluated based on the MFMT-MMDD hierarchical modeling method,and selective maintenance decision is formulated for the ASS based on RSIM importance.