Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Factorial design 1

Status
Not open for further replies.
Karikoga

Karikoga

Chemical
Joined
Feb 10, 2013
Messages
3
Location
ZA
I hope I will explain my problem clearly. I want to do pilot plant tests to first screen the significant factors out of five factors, then carry out a response surface DOE to optimise the plant settings based on a few of the significant factors.

My problem is that it is not possible to set any of the factors to their exact values according to the matrix, e.g. pressure 100.0 bar, temperature 80.0 oC. There will be a slight variation in all of these values. For some of the factors the variation can not simply be ignored, not too much, but it is significant. Is there a way of taking this into account?

I hope someone will be able to assist.

Thanks
 
Sort by date Sort by votes
There is a slightly complex theoretical answer, in which you examine noise in your experiment, or there is a rather easier if less efficient answer, which is to measure the sensitivity of your responses to small changes in each factor and then use those to 'correct' your main DOE results.

Personally I'd be inclined to make sure that your levels are set say at least 5 times the natural variability in the factor apart, and use the nominal level in your analysis.



Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376
 
Upvote 0 Downvote
Thanks Greg. This really helps. Thanks again.
 
Upvote 0 Downvote
Thanks Greg. This really helps. Thanks again.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

naah
  • Locked
  • Question Question
Risk assessment/ Riskanalysis of design change
Replies
2
Views
965
GregLocock
GregLocock
JerinG
  • Locked
  • Question Question
Books on welded structure design
Replies
7
Views
1K
JerinG
JerinG
michael0456
  • Locked
  • Question Question
Actuator Design game-changer
Replies
4
Views
367
michael0456
michael0456
JimSlice
  • Locked
  • Question Question
Incorporation of prototype drawings into design drawings and certification of drawings
Replies
0
Views
239
JimSlice
JimSlice
joybaker
  • Locked
  • Question Question
Mixture design in Minitab, calculate coefficient and P-value
Replies
2
Views
300
joybaker
joybaker

Part and Inventory Search

Sponsor

Back
Top