Design of Experiments Lecture Seven
Introduction Researchers use EXPERIMENT to answer questions such as … Under what conditions the chemical refinery should be operated? Is a drug a safe, effective cure for a disease? Experiments allow researchers to examine different conditions to get the optimum outcomes. Prepared by … Dr. Magdy A. Khalaf 2
Introduction Prepared by … Dr. Magdy A. Khalaf 3 Input Output Process Controllable factors Uncontrollable factors
Introduction … DOE terminology Response Variable … the parameter we are observing as the outcome of the experiment. Mfg: Yield of a Process Service: Customer Satisfaction Factors … Input variables that can be changed during experiments. Levels … Specific values of factors (inputs ) Continuous or discrete Prepared by … Dr. Magdy A. Khalaf 4
Introduction … DOE terminology Controllable Factors … factors that we vary in the process to achieve changes in the response. These factors are controlled by setting them at specific levels for each run, or trial, of the experiment to calculate the effect of each factor on the response. Mfg: Furnace Temp., Fill Pressure, Material Moisture Service: Process Design, Follow-up process Uncontrollable Factors … factors that cannot be controlled in actual operations, but may be controlled during experimentation. Mfg: Humidity, air pollution Service: Arrival rate, efficiency Prepared by … Dr. Magdy A. Khalaf 5
Introduction … DOE terminology Replication Completely re-run experiment with same input levels Used to determine impact of measurement error Interaction Effect of one input factor depends on level of another input factor Prepared by … Dr. Magdy A. Khalaf 6
DOE … Objectives Determine influential variables (factors) Determine where to set influential factors to optimize response Determine where to set influential factors to minimize response variability Determine where to set influential factors to minimize the effect of the uncontrollable factors Prepared by … Dr. Magdy A. Khalaf 7
DOE vs. Historical Data
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- Spring '19
- Magdy Khalaf
- Dr. Magdy A. Khalaf