PSD definition

hiranwale_bharat

Hello,

 

I have PSD definition in terms of log g^2/hz instead of g^2/hz. What is the difference between these two? How should I give input for PSD? Will taking anti log of these values suffice?

 

Regards,

Bharat

Rahul Rajan_21763

The below table should explain you to use the consistent units / conversion in RRA.

 

PSD - Input	Model - Units	SPCD (FRF)	PSD - Output	RMS - Output
G ^ 2 /Hz	mm	9810	(mm/s2) ^2 / Hz	mm/s2
(mm/s2) ^2 / Hz	mm	1	(mm/s2) ^2 / Hz	mm/s2
G ^ 2 /Hz	mm	1	G ^ 2 /Hz	G

hiranwale_bharat

Hello Rahul,

 

Thanks for replying. I knew about this conversion.What I would like to know is the difference between 'log value of g^2 / Hz' and 'g^2/hz' (i.e. no log value ).

 

Will taking antilog values of log magnitude of g^/hz will give me 'regular' values of g^ /hz used in PSD?

 

Regards,

Bharat