Maintainability virtual evaluation method based on fuzzy multiple attribute decision making theory for civil aircraft system

Maintainability evaluation is the main method to assess the maintainability level of product. Maintainability design attributes of civil aircraft are determined by analysis of maintainability influencing factors; and the calculation method of each attribute is proposed by the means of maintenance task virtual simulation, rapid upper limb assessment and maintainability checklist. In terms of multiple attribute decision-making theory, the pretreatment methods of maintainability attributes are proposed, and the comprehensive maintainability evaluation model of civil aircraft system is established based on fuzzy theory and multiple attribute decision making method in this paper. Moreover, an instance combined with comprehensive evaluation of two different types of nose landing gear system is given to illustrate the effectiveness of the model.