170346 20260410165451.0 doi 10.1177/1748006X251414181 sideral 148839 ART-2026-148839 eng Badía, Francisco Germán Universidad de Zaragoza (orcid)0000-0002-6651-3306 A mixed non-homogeneous Poisson process to model the quality of maintenance 2026 We present a model for the corrective and preventive maintenance of a system. The latter is based on a bivariate policy that replaces the system either at age T or after the M failure, whichever comes first. A repair follows each of the M − 1 first failures, restoring the system operational state, but with a lower reliability than before failing. We present two scenarios with constant and time-dependent repair costs. The results reveal that systems with low initial reliability can greatly benefit from the bivariate policy. The advantage decreases for poor quality repairs. We also obtain conditions to obtain the optimum number M when T is given. This result is helpful to assess whether a system should be replaced sooner than originally planned. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by-nc https://creativecommons.org/licenses/by-nc/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Berrade, María Dolores Lee, Hyunju Villegas, Iker 2007 265 Universidad de Zaragoza Dpto. Métodos Estadísticos Área Estadís. Investig. Opera. (2026), [19 pp.] PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART O-JOURNAL OF RISK AND RELIABILITY Proceedings of the Institution of Mechanical Engineers. Part O, Journal of risk and reliability 1748-006X 659855 http://zaguan.unizar.es/record/170346/files/texto_completo.pdf Versión publicada 2357032 http://zaguan.unizar.es/record/170346/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:170346 articulos driver 2026-04-10-13:47:00 ARTICLE