Reliability Equivalence Factors of Series and Parallel Systems in Proportional Hazards Model

This paper considers series and parallel systems with independent identically distributed component lifetimes. The reliability of these can be improved by using the reduction method. In method, system is increased reducing failure rates some its components a factor 0<ρ<1, called equivalent factor. Closed formulas are obtained for equivalence factors. comparisons among performance systems, factors helpful. We discuss that method considered as particular case proportional hazard (PHR) model. Sufficient conditions relative aging comparison under PHR model also developed.