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Issue 97, March 2009

 Hot Topics Reliability Basics Tool Tips Hot News Contribute to HotWire

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Hot Topics

Using Multiple Reliability Tools to Augment Limited Data
In last months Hot Topics article, Joe the reliability engineer was forced to make a decision regarding the B10 life of two products with very limited data. Having to make an important decision based on only a few data points is common when suppliers have expensive hardware and/or limited access to testing equipment. In this case, additional research is often necessary. Other reliability tools, such as comparing test data to field data, relating failure modes seen during the test to a failure modes and effects analysis (FMEA) and even using engineering judgment may be employed to substantiate the conclusions reached with limited test data. This article will discuss some follow-up questions that Joe might ask in order to strengthen his analysis.

Reliability Basics

An Application of BlockSim's Log of Simulations
The need for understanding the risk of certain assumptions or predictions has resulted in the use of variability metrics in multiple disciplines, from the quality control field to financial applications. The most widely used metric to express variability is standard deviation (or variance, the square of the standard deviation). Given the expected value of a metric and a standard deviation, one can obtain the metric of interest at any confidence level, sometimes expressed in terms of the risk level α. However, this assumes that the metric in question follows a normal distribution (the well-known, symmetric, bell-shaped curve). In reality, many measures do not exhibit such behavior. This article will present a simple example of an asymmetric estimate using system availability and BlockSim 7. The simulation log feature of BlockSim 7 will then be used for further analysis of the mean availability via a non-parametric approach followed by a parametric approach in order to obtain bounds.

Tool Tips
• What is the difference between Quick Reports and Customized Reports in DOE++?
• When importing FMEA data from Microsoft Excel into Xfmea/RCM++, does my data have to be in a specific format?

Hot News
ARS, North America Program Posted - Last year we introduced a three-track approach in North America due to the fact there were so many worthwhile presentation proposals. This year we are pleased to announce the continuation of this approach. Please take a little time now to review the final matrix of topics, engineers and organizations representing the engineering community this year. Here is a link to the program matrix: http://www.Arsymposium.org/2009/ars2009_matrix.htm. Keep in mind that everyone attending will be voting for their favorite presentations. Plan to be there!
Advance Registration For ARS North America End in April! Act now to take advantage of the \$200 discount for this year's International Applied Reliability Symposium, North America, which will be held June 9 - 12, 2009 at the Catamaran Hotel in San Diego, California. Visit http://www.ARSymposium.org/register.htm to register by April 15, 2009 for this special rate. Hotel rooms at the Catamaran Hotel will also need to be reserved by May 8th to be eligible for the negotiated Symposium rate.

Upcoming Public Training Event Calendar
 March 2009 March 16 - 20, 2009: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Jakarta, Indonesia March 16 - 18, 2009: RS 522 Advanced System Reliability / Maintainability Analysis in Tucson, Arizona March 19 - 20, 2009: RS 470 Failure Modes, Effects and Criticality Analysis in Tucson, Arizona March 25 - 27, 2009: International Applied Reliability Symposium in Barcelona, Spain April 2009 April 15 - 17, 2009: International Applied Reliability Symposium in Pune, India April 20 - 22, 2009: RS 560 Fundamentals of Design for Reliability in Singapore April 20 - 24, 2009: MSMT Foundations in Tucson, Arizona April 20 - 24, 2009: MSMT Foundations in United Kingdom April 28 - 29, 2009: RS 480 RCM Principles and Applications in Singapore May 2009 May 11 - 15, 2009: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Miri, Sarawak, Malaysia May 13 - 15, 2009: RS 521 Advanced Accelerated Life Testing Analysis in Tucson, Arizona May 13 - 15, 2009: International Applied Reliability Symposium in Curitiba, Brazil May 13 - 15, 2009: RS 511 Application of Reliability Growth Models in Developmental Testing and Fielded Systems in Tucson, Arizona May 14 - 15, 2009: RS 480 RCM Principles and Applications in Larnaca, Cyprus May 18 - 20, 2009: RS 588 DOE: Experiment Design and Analysis in Bangalore, India May 25 - 29, 2009: MSMT Foundations in Singapore May 25 - 26, 2009: RS 470 Failure Modes, Effects and Criticality Analysis in Berlin, Germany May 27 - 29, 2009: RS 588 DOE: Experiment Design and Analysis in Berlin, Germany
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