Comprehensive Performances Test and Evaluation Based on Entropy Weight and Membership Degree Theory for Machine Tools

Kuo Liu, Yongqing Wang, Jiakun Wu, Yue Ma
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Abstract

On the base of analyzing the disadvantages of evaluating machine tools' performances by actual machining method, a kind of comprehensive performances test and evaluation method for machining center is proposed. Comprehensive performances test is done on a VMC-type machining center and the test items include accuracy, reliability, static/dynamic characteristic and efficiency. Suggestions for the improvement of performances are proposed for the tested machining center based on the test results. The evaluation index matrix is established and standardized by TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) method. The evaluation grades of indexes are established based on expert knowledge, the comprehensive weights of indexes are calculated based on entropy weights and expert knowledge, and the single-factor evaluation sets of machine's performances are calculated by membership degree method. Finally, the comprehensive evaluation result of machining center's performances is got based on comprehensive weights and single-factor evaluation sets. The proposed test and evaluation method can also be used for other kinds of machine tools.
基于熵权和隶属度理论的机床综合性能测试与评价
在分析用实际加工方法评价机床性能的缺点的基础上,提出了一种加工中心综合性能测试与评价方法。对vmc型加工中心进行了精度、可靠性、静态/动态特性和效率等综合性能试验。根据试验结果,提出了改进加工中心性能的建议。采用TOPSIS (Order Preference by Similarity to an Ideal Solution)方法建立评价指标矩阵并进行标准化。基于专家知识建立指标的评价等级,基于熵权和专家知识计算指标的综合权重,采用隶属度法计算机器性能的单因素评价集。最后,基于综合权重和单因素评价集,得到加工中心性能的综合评价结果。所提出的试验评定方法也可用于其他类型的机床。
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