129450 20231219145827.0 doi 10.1016/j.ress.2018.07.032 sideral 107672 ART-2018-107672 eng Badía, F.G. Universidad de Zaragoza (orcid)0000-0002-6651-3306 Optimal replacement policy under a general failure and repair model: Minimal versus worse than old repair 2018 We analyze the optimal replacement policy for a system subject to a general failure and repair model. Failures can be of one of two types: catastrophic or minor. The former leads to the replacement of the system, whereas minor failures are followed by repairs. The novelty of the proposed model is that, after repair, the system recovers the operational state but its condition is worse than that just prior to failure (worse than old). Undertrained operators or low quality spare parts explain this deficient maintenance. The corresponding failure process is based on the Generalized Pólya Process which presents both the minimal repair and the perfect repair as special cases. The system is replaced by a new one after the first catastrophic failure, and also undergoes two sorts of preventive maintenance based on age and after a predetermined number of minor failures whichever comes first. We derive the long-run average cost rate and study the optimal replacement policy. Some numerical examples illustrate the comparison between the as bad-as-old and the worse than old conditions. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.039 2018 OPERATIONS RESEARCH & MANAGEMENT SCIENCE 11 / 84 = 0.131 2018 Q1 T1 ENGINEERING, INDUSTRIAL 5 / 46 = 0.109 2018 Q1 T1 1.944 2018 Applied Mathematics 2018 Q1 Safety, Risk, Reliability and Quality 2018 Q1 Industrial and Manufacturing Engineering 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Berrade, M.D. Universidad de Zaragoza (orcid)0000-0002-8035-5762 Cha, J.H. Lee, H. 2007 265 Universidad de Zaragoza Dpto. Métodos Estadísticos Área Estadís. Investig. Opera. 180 (2018), 362-372 Reliab. eng. syst. saf. Reliability Engineering and System Safety 0951-8320 652043 http://zaguan.unizar.es/record/129450/files/texto_completo.pdf Postprint 1022254 http://zaguan.unizar.es/record/129450/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:129450 articulos driver 2023-12-19-13:59:38 ARTICLE