Design of Experiments Flashcards
Design of Experiments
systematic procedure that is carried out under controlled conditions in order to discover an unknown effect and/or to test or to establish a hypothesis
Factors
inputs or controllable variables
Levels
different settings of each factor
Response
output of the experiment
Replication
refers to the repetition of one or more
levels of one or more factors in the DOE
How is statistical significance tested
using ANOVA (analysis of variance)
How is predicted model obtained
regression analysis
Errors
refer to unexplained variations, either within an experimental run or between experimental runs.
Noise Factors
uncontrollable factors that induce variation under normal operating
conditions and these should be avoided.
Correlation
Two factors that vary together may be
highly correlated; they may both be affected by, or
related to, a third factor.
Full‐Factorial DOE
Specify levels for each factor; evaluate
outputs at each combination of factor–level values. Complete,
but requires more experiments; planning is more detailed; can
locate global extremum
One Factor At a Time (OFAT)
Change one factor, keep all others at base value; If output is improved, keep the new level for that factor; Move on to next factor & repeat; Cheaper with fewer experiments, but can’t reveal interactions between factors and locate local extremum.
