Power tells us the probability of rejecting the null hypothesis for an effect of a given size and helps us select an appropriate design prior to running the experiment. This paper describes a general approach for sizing effects that covers a wide variety of designs. Quality and Reliability Engineering International.
After a new hardcoat raised the protection of polycarbonate to a new level, chemists used DOE tools to survey the product and process design spaces. By modeling the critical factors for weatherability and abrasion resistance, they re-optimized their product. (This case study on DOE won the Best Paper Award at the 2001 International Coatings for Plastics Symposium.)
Via case studies, this paper reviews the strategy of foldover on low-resolution (III) two-level fractional factorials and demonstrates how to reduce experimental runs by making use of semifoldover methods to augment medium-resolution (IV) designs.
Apply powerful design of experiments (DOE) tools to make your system more robust to variations in component levels and processing factors.
Mary Kay Inc., the Dallas-based global direct-selling manufacturer of skin care and beauty products, used Design-Expert software from Stat-Ease (Minneapolis, MN) to help avoid product launch delays and unnecessary rework costs. This case study on personal care packaging demonstrates the benefits of multifactor testing. Mary Kay saved over $100,000 in this one application of DOE alone.
This article shows how to do a comprehensive experiment that combines mixture components with process factors in one crossed design, thus revealing interactions that would remain hidden by not combining all the variables in one study.
A 3-year study by the National Renewable Energy Laboratory relied on design of experiments software to plan the experiments. With the aid of this powerful tool, the researchers worked to find the most cost-effective materials for solar air heaters.
PRI Automation has been meeting wafer transport traffic challenges through the manufacturing processes by using designed experiments software. The firm designed and built overhead automated material handling systems (AMHSs) that transport wafers through the manufacturing lines of Intel, Motorola, and other global semiconductor giants. PRI has succeeded partly by discovering how rapidly transport vehicles ought to travel in order to minimize transit time between process steps while increasing AMHS throughput using Design-Expert.
Coding Products’ Hot Ink Rollers, pre-inked foam rollers measuring approximately one inch in diameter, are impregnated with ink before being sent to our wide variety of customers. Before they used DOE to improve the rollers, a customer might get 65,000 impressions from one of our rollers, while the next roller would produce anywhere from 30,000 to 120,000 impressions. Consistency in the number of impressions is crucial because it allows customers to schedule roller changes. Using DOE, the scientists revealed which factors were most critical, leading to decreased manufacturing time, improved productivity, and increased capacity.