Simulation Analysis Of Maintenance Research For Repairable System

With the rapid development of science and technology, the system structure of production equipment is more and more complicated. While their reliability are improved, its purchase and maintenance costs will rise. In this era of economic globalization, factories or business can not only pay attention to high reliability but also the funds of high input. In this situation, it is necessary to have a discussion about the production equipment maintenance plans or strategies. This article is mainly to give explanations from the following three aspects:the introduction of failure regularity and simulation sampling method of different maintenance types; an optimization for cyclical periodic preventive maintenance strategy based on rate minimum principle, a research for complex system preventive maintenance strategy based on maintenance scheduling.Firstly, it analyzes the chang of the failure rate in three circumstances:minor repairs, incomplete maintenances, complete maintenances. The chang rule of the failure rate is discussed in these different situation.And the optimal preventive maintenance strategy model is established by the principle of maximum exploitation degree and minimum loss of life cycle respectively in minor repairs and complete maintenances situation. We get the scope of application of the model by comparison, and then we have a discussion in whether or not to have preventive maintenance by different failure rate changing. Further more,we get the recursive formula of fault time sampling in minor repairs and complete maintenances situation based on the random sampling method of continuous functions.Secondly, in view of the defects that economic utilization of the system is considered just by macroscopic ways, we propose a microscopic way, that using every minor repairs time value of each component to analysis the unit time utilization of each component throughout the preventive maintenance interval. Then we establish a model which can compute the best repairing cycle according to principle "the average loss cost per unit time minimum ". Meanwhile, we take the example of a system which components obey weibull distribution and get the optimal preventive maintenance period of this system after the simulation calculation.Finally, basing on the needs of modern maintenance control theory, we launched research on getting preventive maintenance cycle and workload. We make this assumption to simulate the real situation:the different reliability threshold reflects the importance of system components; the changing age reduction factor and failure rate reduction factor show the fault changing rules of each component in real operation; the failures of repairing equipment reflect the fix mistakes in real maintenance. In this assumption, the preventive maintenance cycle can be got by the reliability threshold. We can also obtain the optimal preventive maintenance frequency(optimal replacement policy) for each part through the principle of minimum loss of life cycle. Then we introduce a preventive maintenance control factor and construct a dynamic preventive maintenance policy model for the system. At last, we take the example of Weibull distribution which is a common life distribution for the engineering components to analyze numerical simulation of 5 unit series systems, and get the annual optimal preventive maintenance plan. This case shows some practical significance for the real operation.