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Math Help - Vibration -- RMS value??

  1. #1
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    Vibration -- RMS value??

    I am looking at a log and I am trying to wrap my head around the root mean squared value...I have look up defenitions but I still cannot get my head wrapped around it.

    For instance, if I am looking at a log that is showing values from 0 - 100
    The max lateral acceleration is 40
    The average is 20

    The log shows the rms value being around 13..but how do you come up with that figure?

    What exactly is root mean squared and why is it important?
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  2. #2
    Junior Member
    Joined
    Jul 2006
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    Let me know if this is correct

    So if you have lateral vibration...you have forward vibration = positive values...and you have backwards vibration = negative values

    so say you have a virbation at +40 and a vibration at -20
    The regular average would be 10
    But rms average makes the negative number positive and takes that average so it would be rms average of 30?

    (40 squared) + (-20 squared) = 2000
    (2000 square root) = approx 45
    45/2 = approx 22.5?

    Is this correct?
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