Presentation on theme: "ME 388 – Applied Instrumentation Laboratory Design of Experiments (DOE)"— Presentation transcript:
ME 388 – Applied Instrumentation Laboratory Design of Experiments (DOE)
Reference (If you can find it) R.D Moen, T.W. Nolan, L.P. Provost, Improving Quality Through Planned Experimentation, McGraw-Hill, 1991 D.C. Montgomery, Design and Analysis of Experiments, 5 th Edition, Wiley, 2001
Six Sigma (black belt) System for constant improvement Use of statistical tools for process analysis, problem solving and improvement Six Sigma statement by GE: …The central idea behind Six Sigma is that if you can measure how many "defects" you have in a process, you can systematically figure out how to eliminate them and get as close to "zero defects" as possible…
Definition A powerful “statistics-based” experimental methodology that is used to efficiently determine how multiple independent variables affect dependent variables of a system or process.
Steps to use DOE Have some technical knowledge of process or system (assumed here) Have some statistics background (assumed here) Design experiment (and run) Analyze data
Terminology Factor = independent variable Level = a given value or setting for an independent variable (for example, a 2- level experiment involves testing a high and low value for each independent variable)
Fractional Factorial Designs Reduce number of test At the expense of complete data Rely on reasonable judgments and technical knowledge –Assume triple, quadruple and greater interactions are not significant