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电火花加工工艺电参数的优化 被引量:1
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作者 郭晓霞 《现代制造工程》 CSCD 北大核心 2013年第11期89-92,共4页
以Cr12MoV为工件材料,研究电火花加工中脉冲宽度、脉冲间隔和放电电流等工艺参数对工艺指标材料去除率、电极损耗率和表面粗糙度的影响。为了优化工艺指标,将相关分析方法与Taguchi方法相结合,通过灰相关度系数值决定优化的工艺参数,最... 以Cr12MoV为工件材料,研究电火花加工中脉冲宽度、脉冲间隔和放电电流等工艺参数对工艺指标材料去除率、电极损耗率和表面粗糙度的影响。为了优化工艺指标,将相关分析方法与Taguchi方法相结合,通过灰相关度系数值决定优化的工艺参数,最后利用方差分析,确定放电电流对工艺指标的最大影响。 展开更多
关键词 电加工 Taguchi方法 灰相关度分析
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Correlation, Principal Component and Grey Relation Analysis of Sweetpotato Root Biological Traits
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作者 汪宝卿 杜召海 +3 位作者 张海燕 解备涛 王庆美 张立明 《Agricultural Science & Technology》 CAS 2015年第3期479-485,共7页
[Objective] This study was conducted to explore the internal relationship among root biological traits of sweetpotato, as well as the regularity in their formation and differentiation. [Method] The root traits of 10 s... [Objective] This study was conducted to explore the internal relationship among root biological traits of sweetpotato, as well as the regularity in their formation and differentiation. [Method] The root traits of 10 sweetpotato cultivars were measured through hydroponic culture in a greenhouse and field survey, and then their correlations were analyzed by statistical methods. [Result] The root morphological traits of sweetpotato at seedling stage such as projected area, surface area, average diameter and volume processed the highest contribution rate (80.56%) 10 d after transplanting, and the contribution rate of root average diameter reached 27.79% 20 d after transplanting. Storage root fresh weight per plant shared extremely significant positive correlations with storage root fresh weight of penultimate node and storage root fresh weight of antepenultimate node, and a significant positive corre- lation with commercial storage root number, and a significant negative correlation with storage root number of penultimate node. Among them, the correlation coeffi- cient of storage root fresh weight per plant with storage root fresh weight of antepenultimate node was the highest (0.659 5). Fifteen days after transplanting, storage root fresh weight per plant had significant negative correlations with root projected area, surface area and volume. There was a significant positive correlation between root dry weight and storage root fresh weight per plant 25 d after transplanting. Root dry weight, volume, length, average diameter of sweetpotato seedlings had higher relational degrees with storage root fresh weight per plant. Ten and twenty days after transplanting were important time for the growth and differentiation of sweetpotato roots. In addition, node length and planting depth had certain influence on sweetpotato yield, and direct relationship existed between the seedling root biological traits and storage root yield of sweetpotato. [Conclusion] The results provide theoretical support for standard cultivation and new variety breeding of sweetpotato. 展开更多
关键词 SWEETPOTATO ROOTS CORRELATION Principal component analysis Grey relational analysis
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