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Issue 24, February 2003

 Hot Topics Reliability Basics Tool Tips Hot News Contribute to HotWire

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Hot Topics
Imperfect Repair
In many cases, at the conclusion of a repair, preventive maintenance action or inspection for a component, it is assumed that the component is returned to an as good as new condition (or replacement). This means that the age of the component is returned to time equals zero. However, this may not always be the case. In fact, the age of the component after the repair may be a percentage of its age at the time when the repair took place. BlockSim 6 allows you to specify a restoration factor, which is used to determine the age of the component once the maintenance action has been completed. This article will explore the concept of the restoration factor and how it can be applied within BlockSim.

Reliability Basics

Design of Reliability Tests
In a past issue of the Reliability Edge (see Cumulative Binomial for Test Design and Analysis), an article was presented on the cumulative binomial distribution and how it can be applied towards test design. Given a specified reliability at a certain time along with a desired confidence level, the required test units (given test time) can be determined to meet the required goal. Calculating the required number of test units is fairly straightforward if the test time is equal to the time at the reliability goal. If this is not the case, then a failure distribution needs to be assumed so that the calculations can be completed. This article presents how this failure distribution can be applied to generate the results using Weibull++ and illustrates the concept of allowable failures.

Tool Tips
• How can I specify which icons are visible on the Data Folio Control Panel in Weibull++?

• Since temperature values must be entered into ALTA in absolute scale, is there a way to automatically convert temperature values in the Data Folio that are in Celsius and Fahrenheit to Kelvin or Rankine?

• How can I find out about ReliaSoft's software validation and QA practices?

Hot News
Announcing Special Pre-Release Pricing on Xfmea - Xfmea is scheduled for release in late March 2003 and will retail for \$1995. When you order Xfmea before the official product release, you will receive a \$400 discount off of the standard price! Xfmea has been designed to facilitate the FMEA/FMECA process and provide flexible data management and reporting capabilities. Xfmea supports major industry standards (SAE J1739, AIAG FMEA-3, SAE ARP5580 and MIL-STD-1629A) and guidelines (ISO 9000, QS 9000, ISO/TS 16949 and Six Sigma), while also allowing users to configure the software to the company's specific analysis and reporting procedures. For more information, please visit: http://XFMEA.ReliaSoft.com.
ReliaSoft at RAMS - Thanks to everyone who stopped by our booth at the 49th Annual Reliability and Maintainability Symposium (RAMS) last month. It was great seeing our old friends and fun making new ones. We look forward to hearing more from you over the course of the year!
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