A SIMULATION MODEL FOR OPTIMIZATION OF MAINTENANCE STRATEGY IN ASSET MANAGEMENT
The optimization of the maintenance strategy of a company is a multi-phase task including contradictory economical and technical requirements. A new simulation model for this area of problems has been developed in Tampere University of Technology in collaboration with Finnish industry. The simulation model can be used for determining the reliability requirements of the system under study (manufacturers viewpoint), for determining the maintenance strategy of the system (owners viewpoint), and for balancing warranty and the risk of failure (manufacturers and service providers viewpoint).The primary concepts of the model are scheduled preventive maintenance (PM), unexpected preventive maintenance (UPM), corrective maintenance (CM) (when a breakdown has occurred), and systems usage and cost profiles during the calendar year. The model connects these concepts by using a multitude of variables, which make the model flexible for interpretations. Stochastic simulation imitates the reality through the life cycle of the system.A critical rolling bearing of a ship propulsion system is used for demonstration. The stochastic failure propagation mechanism after failure detection gives room for a dynamic docking scheduling scheme for cost minimization. The maintenance model is based on replacement of the bearing at regular PM docking and possibly extra replacements at UPM dockings. The failure model is divided into two parts; service life i.e. the lifetime before the detection of a failure and remaining life i.e. the time before the final breakdown of the bearing. If the service life of the bearing ends before the next scheduled PM, and if the remaining life ends with a breakdown, then the ship is unavailable until the planned UPM.In the model the cost of a replacement is fixed, and operators shortage costs depend on the season when the maintenance takes place. By varying the maintenance strategies, the total cost minimization can be performed. In addition to the cost minimization and the maintenance strategy specification, the simulation model is a tool for evaluation of the risk of unexpected failure against the selected warranty terms.
Life model Maintenance Optimization Reliability Simulation Unavailability cost Warranty
Pernu H Hagmark P-E
Tampere University of Technology, Korkeakoulunkatu 6, 33101 Tampere, Finland.
国际会议
北京
英文
1292-1298
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）