System repairs: When to perform and what to do?

A myopic policy for optimal inspection scheduling for condition based maintenance

“…This approach makes decisions by considering one decision interval at a time; as such, it is a myopic approach [37]. Since this approach optimizes over one interval at a time, rather than over the entire life of the asset, it is suboptimal in the long run.…”

“…This repair state and other combinations of the component age and covariate value can be added to the model, using a probability distribution of the possible repair outcome. The degree of repair and the renewed age may be considered as in [37], which includes detailed discussion on repair indicators and virtual age.…”

An integrated safety prognosis model for complex system based on dynamic Bayesian network and ant colony algorithm

“…They involve collecting statistical information from a large number of component samples to indicate the survival duration of a component before a failure occurs, and use these statistical parameters to predict the remaining useful life (RUL) of individual components (Tran et al, 2009). A few statistical models in survival analysis, such as HSMM (Dong and He, 2007), PHM (Samrout et al, 2009), PIM (Lugtigheid et al, 2008;Vlok et al, 2004), PCM (Sun et al, 2006) and EHRM (Louzada-Neto, 1997) are useful tools for RUL estimation. Iung et al (2008) and Muller et al (2004Muller et al ( , 2008 also include maintenance policies in the consideration of the machine prognostic process, in order to provide decision support for maintenance actions.…”

Preventive maintenance and replacement policies for deteriorating production systems subject to imperfect repairs

“…Nguyen and Murthy (1981) considered a special case of imperfect maintenance in that, it could restore the system's effect age back to zero with a higher failure rate. Lugtigheid et al (2008) proposed replacing failed subsystems along with some non-failed parts, to take advantage of the fact that the system has already been uninstalled and taken out of operation. This sort of maintenance brings the state of the machine to somewhere between as good as new and the condition it was in immediately before the failure or preventive maintenance.…”