G Unit To PSD conversion within given frequency range
G Unit To PSD conversion within given frequency range
(OP)
Hi all;
I am given a vibration profile that is stated in G unit between some certain frequency values I wonder if anyone knows conversion and theory behind it to extract the vibration profile in terms of PSD ..
Example:
0.01g^2/Hz 5-10 Hz
2g 10-100Hz
Thanks in advance.
I am given a vibration profile that is stated in G unit between some certain frequency values I wonder if anyone knows conversion and theory behind it to extract the vibration profile in terms of PSD ..
Example:
0.01g^2/Hz 5-10 Hz
2g 10-100Hz
Thanks in advance.





RE: G Unit To PSD conversion within given frequency range
I don't understand what you want, since you have the PSD right there.
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: G Unit To PSD conversion within given frequency range
Unfourtunately no..The vibration profile given as a combination of PSD and i think sine sweep such that;
10-40 0.15 g^/Hz
and the rest is 40 to 500 as 5.5 G limit.
I would like to convert the second part to PSD namely g^/Hz unit so i will get full PSD vibration profile
There is a formula i found from the following link but it doesnt sense me since it only converts a sine peak within df whereas i need conversion within a broad range of frequency
http://www.mpihome.com/english/sineamplitudepsd.ht...
RE: G Unit To PSD conversion within given frequency range
Also from the reference below i found that:
"The frequently used MIL-STD-810 standard states that a 1-to-1 conversion of a sine sweep
test to a random vibration test is not possible and that a measured vibration level is the best
basis for formulation of vibration requirements."
Ref:http://www.sebert.nl/Brochure/Sine_sweep_vs_Random...
So is there an ambiquity on that given profile?
RE: G Unit To PSD conversion within given frequency range
TTFN

FAQ731-376: Eng-Tips.com Forum Policies
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: G Unit To PSD conversion within given frequency range
RE: G Unit To PSD conversion within given frequency range
I have returned to my data provider to give me full PSD
thanks for your support