In this issue: Issue 102, August 2009
 Hot Topics Reliability Basics Tool Tips Latest Software Updates Hot News Contribute to HotWire

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Hot Topics
ReliaSoft's RENO software tool is a platform for building and running analyses for probabilistic or deterministic scenarios using an intuitive flowchart modeling approach and simulation. RENO can be thought of as a "visual spreadsheet" that allows you to graphically create and manipulate data and equations. However, RENO also goes a step further and provides the ability to manipulate internal Excel®-compatible spreadsheets from the flowcharts. In this article we will present an example using these spreadsheets.

Reliability Basics
Bounds on System Reliability
Information for reliability block diagrams often comes from a mixture of sources, including in-house testing, manufacturer data or reliability prediction methods. For any component with information that comes from a manufacturer or a reliability prediction, only the parameters (e.g. MTBF for an exponential distribution or β and η for a Weibull distribution) are available for that component. Without the actual failure times that were used to compute these parameters, it is impossible to compute the variance of reliability for that component. In order to compute bounds on system reliability, it is necessary to know the expected value and the variance of reliability for each component in the system, so the bounds on system reliability are not available in these cases. The bounds on system reliability can be obtained, however, for the special case where all the times-to-failure data for all the components in the system are available. There are several methods to compute these bounds. In this article we will use a simple example to illustrate the method used in Weibull++.

Tool Tips
• How can I incorporate data from my Lambda Predict 3 prediction into my BlockSim analysis?
• What features are available to help me build equations in RENO?

New service releases are now available for BlockSim (SR 7.0.9) and Lambda Predict (SR 3.0.2). To determine the compile revision of the application on your computer, select About from the Help menu. More Software Downloads...
 Application Date Created Version BlockSim BlockSim 7 7/15/09 7.0.9 Lambda Predict Lambda Predict 3 7/2/09 3.0.2
Hot News
Weibull.com Gets Facelift - The weibull.com Web site that provides free theoretical resources for reliability engineering and related fields has a fresh new look that conveniently places valuable reliability engineering resources at your fingertips. Not to worry — your favorite bookmarks are still valid. Check it out at www.weibull.com!
Opportunity Awaits! - Use your creativity, expertise and real-world experience to garner a coveted presentation slot at the 2010 International Applied Reliability Symposium, North America, which will be held from June 15-18, 2010 in Reno, Nevada. The ARS committee is currently accepting presentation proposals through December 4, 2009. For consideration, please submit your proposal by the deadline. If your presentation is selected, you will gain not only the prestige of being a presenter, but also complimentary registration to the event, an ARS logo shirt and a shot at winning one of the Excellent Presentation Awards! Complete details (including the required proposal form) are available for your review at http://www.ARSymposium.org/present.htm.
ARS, North America 2009 Proceedings - If you were unable to attend this year, you may be pleased to learn that the proceedings are available for purchase for only \$145 plus any applicable shipping charges. Physical shipments include four spiral bound books and one CD-ROM.

New Building Location for ReliaSoft Europe - Please note that our office in Poland has a new address and phone numbers:

ReliaSoft Corp. Poland Sp. z o.o. (www.ReliaSoft.eu)
ul. Skwer Ks. Kard. St. Wyszyńskiego 5, lokal nr 14
01-015 Warsaw, Poland
Phone +48 22 436 67 70 (Polish, English, German and Spanish)
Fax +48 22 436 67 99

Upcoming Public Training Event Calendar
 August 2009 August 24 - 25, 2009: RS 480 RCM Principles and Applications in Chennai, India August 24 - 28, 2009: MSMT Foundations in San Diego, California September 2009 September 2 - 4, 2009: RS 560 Fundamentals of Design for Reliability in San Diego, California September 21 - 25, 2009: MSMT Foundations in Amsterdam, The Netherlands September 21 - 23, 2009: RS 522 Advanced System Reliability / Maintainability Analysis in Tucson, Arizona September 24 - 25, 2009: RS 470 Failure Modes, Effects and Criticality Analysis in Tucson, Arizona September 28 - 30, 2009: RS 560 Fundamentals of Design for Reliability in United Kingdom September 29 - 30, 2009: RS 480 RCM Principles and Applications in Jacksonville, Florida October 2009 October 1 - 2, 2009: RS 480 RCM Principles and Applications in Jakarta, Indonesia October 5 - 9, 2009: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Larnaca, Cyprus October 14 - 16, 2009: RS 525 Simulation Modeling for Reliability and Risk Analysis in Tucson, Arizona October 19 - 23, 2009: RS 540 Reliability and Maintainability Analysis for Repairable Systems in Singapore
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As always, your feedback and contributions are appreciated. ReliaSoft is able to provide the most user-friendly reliability software packages and support because we listen to our customers. This applies to our newsletters and publications as well. We welcome any suggestions or contributions you may have for Reliability HotWire. If you have a topic or article that you think would be useful to the readers of Reliability HotWire, feel free to contact us.