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  1. weRweRweR

    Seeking tool method to work with fault trees in condensed form

    Um...that really doesn't do what I described. It is generic FTA tool, but it is prone to crashing in a Windows 7 environment, especially with a large screen. No complaints are warranted because it is free, but I've been recommending that people go for a paid alternative for any serious FTA.
  2. weRweRweR

    Seeking tool method to work with fault trees in condensed form

    By the way, I'm surprised that a tool doesn't exist for this specific form of the graphical tree. It seems so much more manageable than the typical digital-circuit style schematic.
  3. weRweRweR

    Seeking tool method to work with fault trees in condensed form

    Unfortunately, automation development isn't something I'm able to pursue right now (though it would be fun). Otherwise, I'd consider doing this in Excel or Powerpoint using VBA. Which is why I was seeking a somewhat ready-to-use method. Not necessarily for the analysis, even just the...
  4. weRweRweR

    Seeking tool method to work with fault trees in condensed form

    I've seen mind maps before. It never occurred to me that they can produce the kind of tree in my original post. I realize that hierarchy is a very general concept used in many tools. I'm looking specifically for a tool that can produce the kind of fault-tree hierarchy shown in my original...
  5. weRweRweR

    Seeking tool method to work with fault trees in condensed form

    I have taken to using Powerpoint to generate fault trees in condensed form (please see attached figure). I basically organize the fault tree in a manner similar to Windows File Explorer. It would be nice if the nodes of the tree were collapsible like any good hierarchy navigation GUI. Is...
  6. weRweRweR

    Inclusion/Exclusion Expansion for minimal cut sets

    I am following the OpenFTA (Fault Tree Analysis) User Manual at http://www.openfta.com/Download.aspx. Page 81 uses the inclusion/exlusion expansion to express the top-most fault in terms of minimal cut sets. Page 82 shows the same inclusion/expansion expansion broken up into components...
  7. weRweRweR

    Repeated crash on Win7 64-bit; is version 4.5 real?

    I hope the fact that I'm also posting solutions that may help other users of this app (if they still exist) makes it more acceptable to post to this forum. Along these lines, I think I might have found the cause of the problem. When I installed OpenFTA on a different machine with an...
  8. weRweRweR

    Repeated crash on Win7 64-bit; is version 4.5 real?

    I've tried. The OpenFTA forum is basically a graveyard. OpenFTA is provided to the public explicitly without support. The mechanisms for my shop to get consultation are...well, they make it extremely impractical. This is pretty well the only avenue for getting answers from others who may...
  9. weRweRweR

    Repeated crash on Win7 64-bit; is version 4.5 real?

    I installed OpenFTA version 2 on Windows 7 64-bit. I can draw a fault tree, define Primary Events, and associate each basic event with a Primary Event. However, when I try to validate or create minimal cut sets, the application crashes without any error messages. The log file always says the...
  10. weRweRweR

    OpenFTA radio buttons invisible in defining Primary Event

    Afternote: Actually, it's a pretty nonideal solution. It works for defining Primary Events, but the main fault tree window sometimes becomes blank when the "solution" is in effect. So far, I could avoid this by ensuring that the main fault tree window has the focus when switching to Windows...
  11. weRweRweR

    OpenFTA radio buttons invisible in defining Primary Event

    I found the solution. Change from Windows 7 Basic theme to Windows Classic theme at Control Panel\All Control Panel Items\Personalization.
  12. weRweRweR

    OpenFTA radio buttons invisible in defining Primary Event

    I am test driving an app (OpenFTA, http://www.openfta.com) for small Fault Tree Analyses on Windows 7 64-bit. In one of the functions (defining a "Primary Event"), the radio buttons are not visible. Googling with the following search phrase does not yield anything relevant: open-fta...
  13. weRweRweR

    Primary Events in OpenFTA

    I am familiarizing myself with FTA and OpenFTA. If I have multiple instances of a Primary Event in my fault tree, does that mean that they are all one common event? Thanks.
  14. weRweRweR

    Fault tree analysis & minimum cut set question

    I'm picking up FTA theory from "An Introduction to Reliability and Maintainability Enginenering", Charles Ebeling. In his final FTA example, he has an event consisting of the intersection of 3 events: event = {wheel subsystem failure, b3, b4} "Wheel subsystem failure" (wsf) is further...

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