Reliability Allocation of NC Machine Accuracy Based on Analytic Hierarchy Process and Fuzzy Comprehensive Assessment
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摘要: 数控机床进给系统位置精度影响因素的多层次、多因素,且定性与定量同时存在的特点,为了提高其传动系统的精度可靠性,运用五标度的模糊层次分析法对多种影响因素进行了综合考虑。根据影响程度大小为每种因素分配相应的权重,同时使用模糊评判矩阵表达不确定信息,综合专家经验和实验信息,建立了层次分析结构模型。以某重型数控车床为例,进行了纵向进给系统可靠性分配。Abstract: In order to improve the accuracy reliability of a transmission system for numerical control(NC) machine tools,fuzzy comprehensive assessment matrix(FCAM) was applied to allocate the accuracy reliability of NC machine tool feed system whose reliability indexes can be qualitative,quantitative and multi-hierarchic.A fuzzy analytic hierarchy process(AHP) with five-scale was proposed.Many influence factors were considered and endowed with different weight according to the influence degree.A structural model of AHP is proposed for NC machine tools,which used interval number instead of fuzzy assessment matrix to express uncertain information.It can make use of expert's experience and the field test information comprehensively.A heavy duty machine tool was taken as example to illustrate the application of this method.
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Key words:
- analytic hierachy process /
- laser interferometry /
- matrix algebra /
- position measurement /
- reliability
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