I need to conduct a vibration experiment with 3 accelerometers for a gear box. I'm reading the theory of mainly how to perform the vibration analysis but I don't understand why EMA needs a reference signal, and what it means by it? Also, is it the same for operational modal analysis?

  • $\begingroup$ Keep reading till you find out how a reference signal is used. Then you will know if you need it, and why. You don't always need a reference signal - it depends what you are trying to measure. $\endgroup$ – alephzero Mar 26 '17 at 2:47
  • $\begingroup$ @alephzero I have, thanks. When we derive the vibration mode shapes thriugh numerical simulations based on the mathematical model, is that considered numerical modal analysis? and then we can correlate with experimental modal analysis? $\endgroup$ – spe4ker Mar 26 '17 at 21:34

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