为了建立科学的评价指标体系,降低评价过程的复杂性,合理分配各指标的权重,保证评价结果的客观性和科学性.在对工程材料评价指标进行标准化处理的基础上,提出评价指标的贡献和区分度概念,确定了指标定量筛选依据,即当区分度小于0.002时,该指标应该被剔除.以上述依据对6种低温存储罐材料(不锈钢)的8个评价指标进行筛选,根据筛选前后的两个指标体系,采用加权平均法,对6种候选的不锈钢材料进行综合评价.结果表明,由两组指标得出的评价结果完全一致,且后者由于删除了冗余指标,使得权重的分配更加合理和准确,因而显著提高了评价结果的差异程度,更好体现不同候选材料的优劣差异.说明基于区分度定量分析工程材料的评价指标合理、可行.
In order to build a scientific evaluation index system to reduce the complexity of evaluation course, and distribute the weight of each index reasonably, on the basis of normalizing the evaluation indices of engi-neering materials, the conceptions of contribution and distinction degree of evaluation index are put forward in this paper, and the criterion of index quantitative selection is determined, i.e. the index should be deleted when its distinction degree is less than 0. 002. Eight kinds of evaluation indices of six kinds of low temperature storage container materials (stainless steel) were quantitative analyzed according to the criterion mentioned a-bove, and six kinds of stainless steel were comprehensively evaluated with weighted average analysis according to the index system before and after quantitative analysis. The solution shows that, the evaluation results ob-tained from the indices after quantitative analysis are consistent with those obtained from initial indices, which can more effectively reflect whether the candidate material is applicable to the working condition or not, vali-dating the feasibility of quantitative analysis evaluation indices of engineering materials based on distinction de-gree.
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