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  1. meverett85

    Reliability Phase Modeling

    Question on how to find reliability when you have two different time periods rolled up into the overall reliability requirement. I'm having a doozy of a time trying to create a reliability model for a range safety system that has multiple independent strings. For illustrative purposes, let's...
  2. meverett85

    Reliability Testing

    So I think I've figured out a good way to do this: 1) Identify the theoretical reliability for the system for a given amount of time. 2) Calculate the MTBF using equation R = e^(-t/MTBF) 3) Figure out the Chi-Square value for 95% confidence and zero failures: To do this use equation Testing...
  3. meverett85

    Reliability Testing

    You are on to something....you must have range experience! You are referring to what we call launch mandatory reliability. And the window is T-6 hours before launch to T-0. From T+0 to T+5 minutes we call this Flight Termination reliability. You are correct that if we have a certain amount of...
  4. meverett85

    Reliability Testing

    Interesting....so let's say I took a stab at this. Reliability = e^-(failure rate*time) Therefore, for R = .999 and a time of 5 minutes, solving for failure rate = .01201 or Mean Time Between Failure of approximately 83 hours (1/.0121). If I said test the system for 83 hours and see how many...
  5. meverett85

    Reliability Testing

    Hi all, Short background: In my line of work, we must be able to destroy an errant launch vehicle if it is determined to be outside of the predetermined acceptable corridor. We do this by having transmitter sites that send RF commands to the vehicle. In any case, when a developer is put on...

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