a new continuous multi-state reliability model with time dependent component performance rate

A css is a system with the continues-state components. when a component has the ability to obtain all the situations from completely working to completely failed, it named continues-state component. in the real world, performance rate of elements are continuous and decrease by time. continuity of components causes infinite working states and grows up the system states. in this paper we propose a new method for series-parallel continues-state rap using ugf for multi-state systems. in this method at first we consider a binary cfr system. using weibull distribution function for the performance rate of working state, this system upgraded to a csc. then the ugf for a series-parallel system has been studied and a numerical example presented to illustrate the reliability and availability computation.