leaper 发表于 2024-7-29 17:30:47

DOE实验设计4因子2水平，做部分因子实验如何避免效应混淆？

各位专家，

请问你们平时审核工厂DOE文件吗？我发现有的工厂有做过。有的根本就不会DOE解析度，所以没做。有一次发现DOE实验设计4因子2水平，全因子就要做16次，工程师做了半因子的8次。8次即满足解析度IV（主效应和三阶相混淆，二阶与二阶相混淆）的实验设计了。全因子可以避免但是成本高不愿意实施。通常二阶与三阶混淆能接受。对于8次实验解析度IV该如何准确判断实验效果呢？做部分因子实验如何判断效果混淆的影响？

nanfeng36 发表于 2024-8-1 21:58:34

What is the design resolution in a factorial design?

Design resolutions describe how much the effects in a fractional factorial design are aliased with other effects. When you do a fractional factorial design, one or more of the effects are confounded, meaning they cannot be estimated separately from each other. Usually, you want to use a fractional factorial design with the highest possible resolution for the amount of fractionation required. For example, it is usually better to choose a design where main effects are confounded with 3-way interactions (Resolution IV) instead of a design where main effects are confounded with 2-way interactions (Resolution III).

Resolution III, IV, and V designs are most common:

Resolution III
No main effects are aliased with any other main effect, but main effects are aliased with 2-factor interactions.
Resolution IV
No main effects are aliased with any other main effect or 2-factor interactions, but some 2-factor interactions are aliased with other 2-factor interactions and main effects are aliased with 3-factor interactions.
Resolution V
No main effects or 2-factor interactions are aliased with any other main effect or 2-factor interactions, but 2-factor interactions are aliased with 3-factor interactions and main effects are aliased with 4-factor interactions.

114729789 发表于 2024-7-30 08:13:42

内容太深奥，完全看不懂{:1_184:}

Rexxar 发表于 2024-7-30 08:34:34

查会话栏，看哪些二阶存在混杂。我查了一下默认是AB=CD，AC=BD，AD=BC。再根据工程经验，判断感兴趣的交互作用是否存在混杂。如有混杂，调整ABCD因子的顺序看是否能够解决，不能解决就只能做16次试验了。

njkiller 发表于 2024-7-30 08:47:11

学习学习

32558683 发表于 2024-7-30 09:07:57

{:1_180:}

Shane1392016 发表于 2024-7-30 10:23:12

审核很少审核DOE吧，只有看具体问题解决可能看到你们这个了

leaper 发表于 2024-7-30 10:26:36

Rexxar 发表于 2024-7-30 08:34
查会话栏，看哪些二阶存在混杂。我查了一下默认是AB=CD，AC=BD，AD=BC。再根据工程经验，判断感兴趣的交互 ...

谢谢。 这些我也查过，最后还是我们自己决定。工厂工程师看不懂因子效应混淆。他们只会等客人让他怎么测就怎么弄？又嫌全因子试验耗时耗材不执行。

leaper 发表于 2024-7-30 10:33:39

Shane1392016 发表于 2024-7-30 10:23
审核很少审核DOE吧，只有看具体问题解决可能看到你们这个了

是的。就是看具体问题解决办法发现的。缺乏专业知识很多都不做实验设计。

刘大棒子 发表于 2024-7-30 10:58:27

{:1_180:}

xiaowei646 发表于 2024-7-30 20:25:49

工厂存在的价值是生产产品。公司是靠卖出产品盈利的。DOE这么复杂的事情，占用产线来做本来就不对，工厂是在替设计擦屁股！
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