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Median Ranks Calculation for Fractional Failures

In the September 2015 issue of Reliability HotWire, we discussed fractional failure analysis and provided an example on how to perform the analysis in Weibull++. The analysis takes into account the effectiveness of an assumed corrective action or product redesign. If the corrective action or the improvement in the redesign is not 100% effective on the failure mode being analyzed, a certain percentage of the failure mode is removed by changing it to a partial failure and a partial suspension. In this issue, we will describe how the unreliability estimates are calculated in the analysis.


Read the Latest Reliability News

2016 ARS India Excellent Presentation Award Winners

The 2016 International Applied Reliability Symposium India in Bangalore wrapped up last month. Thank you to all the presenters who shared their experiences, challenges, insights and solutions with the reliability and maintainability engineering community. Congratulations to the following award winners:

  • Gold - Jatinder Kumar of Mahindra and Mahindra Ltd.
    Re-defining the Reliability Program for a "New Product" — A Success Story
  • Silver - Arunkumar Sundararajan of HCL Technologies
    Reliability Testing and Test Data Management
  • Bronze - Raghavendra VG of CYIENT
    Field Event Analysis of Aero-Engine Components and Their Reliability Study
    and Sumandra Ghosh Chowdhury of Schneider Electric India Pvt Ltd.
    Life Assessment Methodology for Electronic Systems Based on Usage Profile

For more information and to see photos from the event, visit:


Connect with ReliaSoft at the ESREL Conference and AIAG Quality Summit

ReliaSoft will be exhibiting at the European Safety and Reliability Conference (ESREL) in Glasgow, Scotland September 25 - 29, 2016 and at the 2016 AIAG Quality Summit in Novi, MI September 29 - 30, 2016. Visit us to talk with our experts and to learn more about our reliability and maintenance engineering solutions. If you're not able to attend either event, you can learn more about ReliaSoft solutions at:

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