Design of experiments DOE

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Design of experiments (DOE)
Steps
Define problem Define experimental objectives
Select factors that influence quality
Select control noise factors
Select levels for factors
Select orthogonal arrays
Select interactions
Conduct tests
Analyze results
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Design of experiments (DOE)
Breadmaking problem
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Design of experiments (DOE)
How many loaves of bread to get "best" set of
ingredients?
6 factors, each w/ 2 levels gt 26 64!
Taguchi method (Genechi Taguchi) says only a few
needed
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Design of experiments (DOE)
Testing methods
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Design of experiments (DOE)
Testing methods
Better.."orthogonal" Standard L4 orthogonal
array
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Design of experiments (DOE)
Which OA to use? Depends on of factors
interactions of levels for each factor
Use L4, L8(7 factors), L12(11 factors), L16(15
factors),..OAs - determined by trials to be
run
of levels usually 2 or 3
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Design of experiments (DOE)
Some factors may interact. Then