×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Factorial design

thread962-354961

Factorial design

Factorial design

(OP)
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

RE: Factorial design

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: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Factorial design

(OP)
Thanks Greg. This really helps. Thanks again.

RE: Factorial design

(OP)
Thanks Greg. This really helps. Thanks again.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close