The Component Importance Evaluation Based on System Network and Fuzzy Partial Ordering Relation

The reliability and safety of a system, notwithstanding it intended function, can be significantly influenced by the characteristics of components that define the system, especially the critical components. Importance evaluations are component related indices that allow to assessing how a component in the system affects one or more components. This paper assesses the component importance through two aspects. The first perspective is based on the system network modeled, which is the assessment of the structure position effect. The other aspect is the component reliability taken into account which reflects the function status on the basis of the fuzzy partial ordering relation model. Finally, a numerical instance of the bogie system is presented to show the rationality of the results compared with a previous method.