民机结构环境损伤的组合赋权评定方法

摘要

针对民机结构环境损伤评定问题进行研究,基于国内研究的现有赋权方法或者偏重主观经验或者过分依赖客观数据的现状,提出基于组合赋权的评定模型方法.该模型采用层次分析法确定主观权重,采用粗糙集理论中决策表的信息熵知识确定客观权重,然后利用向量夹角公式,找到二者之间合理的权重分配系数,实现组合赋权,进而确定总等级,并根据等级间隔对应关系确定检查间隔.最后以某型飞机的重要结构项目为例进行验证分析,效果良好.%Environmental deterioration rating of aircraft structure is studied.The existing weighting methods depend on either subjective experience or objective data overly,and the rating method based on combination weighting is presented.The rating model uses analytic hierarchy process to determine the subjective weight,and the objective weight is obtained with information entropy of decision table in rough sets theory.Then the reasonable distribution coefficients between the two weight vectors are calculated with vector angle formula,and the combination weighting is obtained.Furthermore,the determination of total rating and inspection interval by rating-interval regression equation is performed.Finally,the structural significant items of a certain type aircraft are taken as examples to verify the proposed method.