earticle

영어

A preventive maintenance model, called FNBM( a , , )? model, is proposed to decide an optin. repair number under inherent availability requirements(r) along with taking two types of failures (repairable or irrepairable) into account.
In this model, the current system is replaced by a new one in case when it doesn't meet the inherent availability requirement, even though it is repairable failure; Otherwise it is replaced in time of the first irrepairable failure.
Assumed that the j -th failure is repairable with probability a j' minimal repairs are allowed for repairable failures between replacements. Expected cost rate for preventive maintenance model is developed using NHPP(Non-Homogeneous Poisson Process) in order to determine the optimal number N*.
This pr'osed model is thought to be better than previous models, especially for weapon system which requires availability as primar' parameter.