基于区间层次分析法的数控机床可靠性预计

针对将传统相似比较法用于数控机床可靠性预计时,评价对象和相似产品之间可靠性水平的差异程度很难准确评定的问题,提出了一种引入区间层次分析的数控机床可靠性预计方法。首先分析了整机和子系统的可靠性关系,建立了整机的可靠性预计模型。在子系统可靠性预计过程中,充分利用了相似产品的可靠性数据。全面分析了评价对象和相似产品之间的差异,建立了可靠性修正因子评估模型。使用区间层次分析法求出了可靠性修正因子,实现了确定性信息和模糊信息的互补。结合实例进行了数控机床的可靠性预计,验证了该方法的可行性。

Reliability prediction for NC machine tool based on interval AHP

In view of the problem that it is difficult to determine the difference degree of reliability levels between the evaluation object and similar products when using similar comparison method to predict the reliability level of NC machine tools,a reliability prediction method introducing interval analytic hierarchy process(AHP) was presented.The relationship between the whole machine and its subsystems was analyzed,and a reliability prediction model was built for the whole machine.The reliability data of similar products were used in the course of reliability prediction for subsystems.The differences between the evaluation object and the similar products were comprehensively analyzed and an evaluation model for reliability correction factor was built.The reliability correction factor was obtained by using the interval AHP,realizing the mutual complement of certain and fuzzy informations.The application of this method was illustrated with an example,verifying the feasibility of the method.