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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

    jedishrfu

    Staff: Mentor

  4. Jul 23, 2015 #3

    boneh3ad

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    Science Advisor
    Gold Member

    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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