Active Redundancy Allocation Strategy at Component and System Level
Provides theoretical guidance for reliability engineers on where to allocate redundancies in dependent-component systems.
The paper derives sufficient conditions for optimal allocation of two heterogeneous active redundancies at component or system level in coherent systems with dependent components, using copula-based distortion functions. The results guarantee likelihood ratio or reversed hazard ordering between systems.
Researchers and practitioners in the field of reliability engineering and optimization frequently use active redundancy techniques to intensify the performance of systems. In this article, we study allocation strategies of non-matching active redundancies (spares) in coherent systems consisting of possibly dependent and identical components for achieving better system reliability. The dependence of the components is modeled through copulas using the distortion function. Sufficient conditions are derived to establish optimal allocation strategies for two heterogeneous active redundancies at the component or system levels. Moreover, the results are true for the component lifetimes following a general family of parametric distributions. The results guarantee the likelihood ratio (reversed hazard) ordering between the coherent systems at the component level (system level) active redundancies. Some aging properties are also established in this endeavor. Several examples are provided to demonstrate the theoretical results.