RANDOM VIBRATION DATA CONVERSION
RANDOM VIBRATION DATA CONVERSION
(OP)
Hello,
I have with little knowledge of Rnadom Vibration but working on a project that requires some. I have been given a sample of random vibration data from a road car (z axis). This data has been logged at 5000Hz and in G.
Is there a way of taking this data and converting it into somthing I can test on a vibration table with?.
I beleive this can be done by means of the "Fourier transform" method but will need some guidance.
Any help would be greatly appreciated.
I have with little knowledge of Rnadom Vibration but working on a project that requires some. I have been given a sample of random vibration data from a road car (z axis). This data has been logged at 5000Hz and in G.
Is there a way of taking this data and converting it into somthing I can test on a vibration table with?.
I beleive this can be done by means of the "Fourier transform" method but will need some guidance.
Any help would be greatly appreciated.





RE: RANDOM VIBRATION DATA CONVERSION
What are you trying to do with it? Test a component's durability? Or simulate the road for noise work?
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: RANDOM VIBRATION DATA CONVERSION
Alternately, you can Fourier Transform the time series, clean up the frequency profile and feed that to the shaker.
Thirdly, you can do the above, add a guardband in the frequency domain and feed that profile to the shaker.
TTFN
RE: RANDOM VIBRATION DATA CONVERSION
Basically the data is from a car and taken at 5000HZ time intervals with a series of G readings. I have some kit that I have tested on a shaker table and am quite sure we have used the right profile, 15g 30-1000Hz. I want to see if I can use fourier transform but have very little knowledge of how to extrapolate the required data.
RE: RANDOM VIBRATION DATA CONVERSION
Note that a PSD can be calculated from a Fourier transform.
Published examples of PSD for automobiles are difficult to find due to the highly competitive nature of the auto industry.
A good a example of a PSD for "truck vibration" is given in MIL-STD-810F, Meethod 514.5, Figure 514.5C-1.
Also, refer to:
http://w
Tom Irvine
www.vibrationdata.com