Using Mixture Designs in DOE++

Reliability HotWire is a monthly eMagazine by ReliaSoft providing information and tips on how to best improve your reliability practices and get the most out of ReliaSoft’s tools for reliability and life data analysis.

In design of experiments, a mixture is defined as a product that is formed by mixing together two or more individually distinct ingredients, known as the mixture components. In some cases, the properties of the mixture are only dependent on the components and their proportions, and not on the amount of the mixture. For example, one cup of 10% hydrogen peroxide solution in water has the same properties as one gallon of 10% hydrogen peroxide solution in water. In other cases, outside influences such as process variable settings can affect the properties of the mixture as well. For example, the viscosity of a polymer solution will depend not only on the concentration of polymer in the solution, but also the mixing speed because higher speeds can break the polymer chains, leading to shorter chains and therefore a lower viscosity of the mixture. In this article, we describe the four common mixture designs followed by an example using DOE++ that illustrates how to create a mixture design. Read more

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ReliaSoft Award Winner at Annual RAMS Symposium

Congratulations to Miklós Szidarovszky, Harry Guo and Ferenc Szidarovszky, winners of the 2016 Stan Oftshun Award, an honor given for the best paper at the Annual Reliability and Maintainability Symposium (RAMS) presented by a Society of Reliability Engineers (SRE) Member. Their paper “Optimal Maintenance Policies under Changing Technology and Environment” was presented during RAMS in Tucson, Arizona from January 25 – 28, 2016. To view the research papers presented by ReliaSoft, please visit http://www.weibull.com/knowledge/papers.htm

Call for Presenters at ARS India We are looking for presenters who want to share applications, success stories and lessons learned in reliability and maintainability engineering and also spark discussion and help discover best practices. The deadline for presentation proposals is March 25, 2016 for the August 10 – 12 Symposium in Bangalore, India. If you are interested in presenting, please visit http://www.ARSymposium.org/india/whypresent.htm for more information. Further Information To read more on the above topics or to subscribe to the monthly eMagazine please click here If you would like to speak to someone regarding ReliaSoft software, training and consultancy services, please contact us.