Lately I have came across a vibration design criteria with 1/3 Octave Band. Been doing a lots of dynamic analysis on narrowband but this 1/3 octave band is rather new to me. Some suggest we assign narrow band amplitude (fixed interval) into octave bin and sum them, some suggest to average them.
Gut feelings tells me it has something to do with Y-axis terms. So my questions are:
When we are using velocity rms, do we sum it or average it? and why?
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