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On a new age‐replacement policy for items with observed stochastic degradation
Author(s) -
Finkelstein Maxim,
Cha Ji Hwan,
Levitin Gregory
Publication year - 2020
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/qre.2619
Subject(s) - degradation (telecommunications) , sensitivity (control systems) , process (computing) , failure rate , gamma process , computer science , preventive maintenance , stochastic process , reliability engineering , mathematics , mathematical optimization , statistics , engineering , telecommunications , electronic engineering , operating system
A new methodology for preventive maintenance of degrading items is discussed. It combines the classical age‐replacement strategy when a system is replaced either on failure or on reaching the predetermined age, with replacement on reaching the predetermined level of deterioration at some intermediate time. Degradation of an item is modeled by the nonhomogeneous gamma process, whereas its failure occurs when this process reaches the predetermined deterministic level. It is shown that the proposed policy outperforms the classical one, i.e., it achieves the lower value of the corresponding long‐run cost rate. The detailed numerical illustration is presented, and the relevant sensitivity analysis for the main parameters of the model is performed.