2 6 = 64! Taguchi method (Genechi Taguchi) says only a few needed">

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Design of experiments (DOE) Steps Define problem Define experimental objectives Define problem Define experimental objectives Select factors that influence.

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Presentation on theme: "Design of experiments (DOE) Steps Define problem Define experimental objectives Define problem Define experimental objectives Select factors that influence."— Presentation transcript:

1 Design of experiments (DOE) Steps Define problem Define experimental objectives 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

2 Design of experiments (DOE) Breadmaking problem: Level Factor flour2 1/3 cups all-purpose2 1/3 cups special 2.sugar2 Tsp2 1/2 Tsp 3.salt1 tsp 1/2 tsp 4.butter1 Tsp1 Tsp margarine 5.milk1 cup homogenized1 cup low-fat 6.dry yeast1 tsp brand A1 tsp brand B Level Factor flour2 1/3 cups all-purpose2 1/3 cups special 2.sugar2 Tsp2 1/2 Tsp 3.salt1 tsp 1/2 tsp 4.butter1 Tsp1 Tsp margarine 5.milk1 cup homogenized1 cup low-fat 6.dry yeast1 tsp brand A1 tsp brand B

3 Design of experiments (DOE) How many loaves of bread to get "best" set of ingredients? 6 factors, each w/ 2 levels ––> 2 6 = 64! Taguchi method (Genechi Taguchi) says only a few needed

4 Design of experiments (DOE) Testing methods Factors and factor levels Trial ABCD Factors and factor levels Trial ABCD

5 Design of experiments (DOE) Testing methods Factors and factor levels Trial ABC Factors and factor levels Trial ABC Better…….."orthogonal" Standard L4 orthogonal array Better…….."orthogonal" Standard L4 orthogonal array

6 Design of experiments (DOE) Which OA to use? Depends on: # of factors & interactions # of levels for each factor Which OA to use? Depends on: # of factors & interactions # of levels for each factor # of levels usually 2 or 3 Use L4, L8(7 factors), L12(11 factors), L16(15 factors),…..OAs - determined by # trials to be run

7 Design of experiments (DOE) Some factors may interact. Then: Factors and factor levels Trial ABC(=AxB) Factors and factor levels Trial ABC(=AxB)


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