J. Safari

This paper presents a new mathematical model of a redundancy allocation problem with mixing components redundant in subsystems of a series-parallel system when the redundancy strategy can be chosen for individual subsystems. In practice both active and cold-standby redundancies are used within a particular system design, and the choice of the redundancy strategy becomes an additional decision variable. The proposed model selects the best redundancy strategy, combination of components, and levels of redundancy for each subsystem in order to maximize the system reliability under system-level constraints