SIMMAT: an aircraft materials remanufacturing system simulation model. Part II: implementation and evaluation

Abstract

Following conceptual development a prototype data-driven simulation model was developed, for decision support, with an actual aircraft materials remanufacturing system located in Christchurch, New Zealand. The model consists of structured logic statements based on observations and information supplied by the system's staff. It processes information relating to staffing levels and the work received over time. Processing times are represented using stochastic probability distributions. Outputs include numerical data and animated graphics. For evaluation purposes the model was set to simulate Repair Group operations for a recent period of time. It was found that after an appropriate warm-up period, performance could stabilise at levels consistent with normal operation. Simulated workloads were compared against the expectations of experienced staff. It was felt that the model gave a credible indication of how the actual system had performed. Two ""what-if"" scenarios were also investigated that staff should have found reminiscent with their own experiences. The effect and duration of changes under these scenarios were as consistent with staff expectations.