Why Use PSD Curves in Random Vibration Analysis?

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SUMMARY

The discussion centers on the use of Power Spectral Density (PSD) curves in Random Vibration Analysis, emphasizing their superiority over traditional acceleration versus time graphs. PSD curves, expressed in g²/Hz and Hz, effectively illustrate the distribution of energy across various Fourier components of a signal. This method allows for clearer identification of dominant signal characteristics, such as natural frequencies and their harmonics, which are often obscured in time series data. A referenced writeup provides additional insights into the application of PSD curves in vibration analysis.

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aniruddha
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In the analysis of Random vibration, we use the PSD curves as the input, I am confused as to why we simply don't use acceleration versus time graph but instead convert it into g^2/Hz and Hz.
 
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I don't know the answer to your question but I found this writeup that talks about vibration isolators and the use of PSD curves:

http://www.emtengineering.com/wp-content/uploads/2013/04/Barry-Controls-Random-Vibration.pdf

see page 10
 
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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