Taguchi DoE - strength of interactions
Taguchi DoE - strength of interactions
(OP)
In real life cases where the process is already reasonably well centred, has anybody come across systems where interactions are as strong as the individual factors? That is where the sensitivity to A.B is as great as A or B alone? I'd like to exclude chemical reactions or other 'obvious' examples.
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Greg Locock
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RE: Taguchi DoE - strength of interactions
RE: Taguchi DoE - strength of interactions
Hmm, yes designing aeroplanes is an example where interactions are important, but I wonder if that is true for small perturbations in design that is already near an optimum? Once upon a time I was discussing the mad enthusiasm for DOEs that had taken over the company with a friend of mine and either me, him or the beer said that "You should only use DoEs when you know everything about the system, or nothing"
The example I'm looking at is crosswind stability for an SUV, I'm changing the yaw and roll moment coefficients and the side force coefficient, vs yaw angle, (and the other 3 but they don't matter) and I'm only getting very weak interactions, which is great because I can go and ask the aero people to change specific things, but I then started wondering how often other people see strong interactions.
Cheers
Greg Locock
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RE: Taguchi DoE - strength of interactions
In the case of many systems, proportional control means that the closer you get to the control point, the less effect the feedback mechanisms have, which applies to any conventional nulling system.
TTFN (ta ta for now)
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RE: Taguchi DoE - strength of interactions
So, in a simple 3d surface of optimisation between 2 factors, near the peak the surface tends to be well rounded, and does not have any clefts or spiky ridges near it (those are interactions), for a general mechanical system. Whereas with a chemical reactions between two reagents, calculating %age in a solution say as the response, the response surface is an almost perfect ridge along the ideal proportions for the two reagents. Sounds good.
So for general mechanical type problems, are there practical examples where the interactions are as strong as the primary effects?
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: Taguchi DoE - strength of interactions
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Taguchi DoE - strength of interactions
In your SUV, you'd probably see pretty strong coupling if the corners of the vehicle were sharp vs. rounded, or if steering was set up to have a lot of adverse roll coupling. Or if you put a giant rudder vane on the roof?
RE: Taguchi DoE - strength of interactions
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: Taguchi DoE - strength of interactions
RE: Taguchi DoE - strength of interactions
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: Taguchi DoE - strength of interactions
RE: Taguchi DoE - strength of interactions
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?