Simulation-based maintenance support system for multi-functional complex systems

We define a complex system with a complex structure that performs several functions as a multi-functional complex system, and represent it as a pseudo-tree structure using gates. In addition, we develop an object-oriented simulation model to estimate the reliability, availability, and maintainability of the multi-functional system with complex structures. We define attributes, methods, and events for objects and develop logics for the random number generation, breakdowns, maintenance, etc. for simulation. We obtain simulation statistics on availability, utilisation of repairmen and stock probability of spare parts. The user-friendly simulation model is implemented as simulation software using general object-oriented language. Its potentials for application are demonstrated in the case of a transfer crane, which can be considered a representative example of a multi-functional complex system.