论文部分内容阅读
以k-out-of-n:f系统为研究对象,首先根据失效的部件数量和系统状态,将故障分为第一类故障和第二类故障。在周期性维护策略模型中,对于预防维护周期内的第一类故障采用最小维护进行处理,并在到达预防维护周期时对系统进行预防性维护,对于周期内的第二类故障通过替换使系统恢复正常。在模型基础上,运用更新过程理论,通过建立包含预防维护成本、最小维护成本和故障性维护成本在内的成本函数,导出使长期单位时间期望成本最小的最佳预防维护周期。最后,通过数值算例的分析说明了模型的有效性。
Taking k-out-of-n: f system as the research object, the fault is divided into the first type of fault and the second type of fault according to the number of failed components and system status. In the periodic maintenance strategy model, the first type of failure in the preventive maintenance cycle is handled with minimum maintenance and the system is preventively maintained when the preventive maintenance cycle is reached, and the second type of failure in the cycle is replaced by the system Back to normal. Based on the model, by using the update process theory, an optimal preventive maintenance cycle that minimizes the expected long-term unit time cost is derived by establishing a cost function that includes preventive maintenance costs, minimum maintenance costs, and faulty maintenance costs. Finally, the validity of the model is illustrated by numerical examples.