Corrective maintenance process modeling and simulation of multi-indenture multi-echelon systems based on MFBD

Due to the increased complexity of the equipment and the uncertainty of the maintenance process, simulation based on a conceptual model is generally used to analyze a complex repairable system's corrective maintenance (CM) process. On the basis of building a maintenance process concept model, the modeling method via a stochastic maintenance function block diagram (MFBD) is presented. Testability characteristics are considered in the model and the simulation model can describe multi-indenture multi-echelon (MIME) system corrective maintenance, in which complicated hierarchy and logical relationship between the process are concentrated. Subsequently, a calculating simulation method of mean repair time of complex repairable system is given according to simulation objects status, which changed in the processes of system maintenance influenced by resources queueing, and finally, a simulation application case of complicated repairable system is constructed to illustrate the simulation, and correctness and applicability of the model is confirmed through the sensitivity analysis by ajusting the influenced factors such as testability design parameters.