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Incorporating Recurrent Event Data Analysis in Reliability Block Diagrams

In a repairable system, the occurrence of a failure is not an independent event and the sequence of these events is not identically distributed in most cases. When a repairable system fails due to the malfunction of a component, the remaining components are still operational and they do have a current age. Therefore, the next failure event of the system depends on this current age of the components, which makes the system-level failure events dependent. If data are collected at the component/subsystem level (the Lowest Replaceable Unit or LRU) then a reliability block diagram (RBD) approach can be used. However, this approach requires detailed information, including failure and repair data at the LRU level. If detailed information is not available, then Parametric Recurrent Event Data Analysis (Parametric RDA) can be used instead. This article provides an introduction to the concept of parametric RDA and follows with an example that compares the results generated in a Weibull++ Parametric RDA folio with the use of corrective tasks with partial restoration in a simulation diagram in BlockSim.


Read the Latest Reliability News

New Videos to Accompany G400 Course in April

ReliaSoft is introducing new software solution videos in the G400 - Foundations of Reliability Engineering Data Analysis and Modeling course. These instructional videos lead you through the seminar’s examples and give you a step-by-step visual demonstration of the solutions. Follow the examples in class, and then take the videos home with you to solve on your own! The first G400 course to include these videos will be from April 20 – 24 in Tucson, Arizona. For more information on the course or to register, please visit


Get Exposure for Your Organization at ARS

Become a Sponsor or Exhibitor at any of the upcoming ARS events, and your organization can gain exposure from thousands of potential attendees through ARS marketing efforts. The recognition will enhance your ability to network at ARS, demonstrate your expertise and influence ARS attendees with your leadership. Plus, with different levels of sponsorship, you can find something that fits your organization's needs. Learn more about it at:


HBM nCode Hosting Training in Tucson, AZ

During the week of June 8 - 12, HBM nCode will provide three training classes at the Reliability Training Center (RTC) in Tucson. The featured courses are: Interactive Data Processing with nCode GlyphWorks on June 8 - 9, Practical Fatigue Theory on June 10 and FE-based Fatigue Analysis with nCode DesignLife on June 11 - 12. For more information and to register for these courses, please visit:

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