Why Use PSD Curves in Random Vibration Analysis?

[aniruddha]

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.

 

[jedishrfu]

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

 

[boneh3ad]

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.