基于可拓学理论的数控机床可靠性评价

Reliability evaluation of numerically-controlled machine tool based on extenics theory

应用可拓学中的物元理论和可拓集合理论,建立数控机床可靠性评价物元模型。引入可拓集合论中的关联函数计算关联度,并结合层次分析法确定指标权重,得到待评机床的可靠性等级。最后以两种国产数控机床为例进行应用研究,结果表明这种方法具有良好的应用性,能得到较合理的评价结果。

A matter-element model was built for the reliability evaluation of the numerically-controlled （NC） machine tool using the matter element theory and the extendible set theory of the extenics. Introducing the relevance function in the extendible set theory to calculate the relevance degree, combining the analytic hierarchy process to define the weights of indexes, and the reliability grade of the NC machine tool to be evaluated can be obtained. Taking two types of home-made NC machine tools as examples to do the practical application study of the proposed method, the results show that the method possesses good practicability, can give the reasonable evaluation on the reliability of the NC machine tool.