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Why PSD curves are used?

  1. Jul 23, 2015 #1
    In the analysis of Random vibration, we use the PSD curves as the input, I am confused as to why we simply dont use acceleration versus time graph but instead convert it into g^2/Hz and Hz.
  2. jcsd
  3. Jul 23, 2015 #2


    Staff: Mentor

  4. Jul 23, 2015 #3


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    It depends on the information you hope to view, but PSDs are generally very useful because they let you see the distribution of energy among the many Fourier components of s given signal. It's a lot more useful to see dominant signal characteristics like natural frequencies an their harmonics using a PSD than it is to try and pick that out of some quasi-random time series.
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