Converting Sine on Rendom to Random only profile
Converting Sine on Rendom to Random only profile
(OP)
I have the following random profile:
4Hz – .0008 G^2/Hz
100Hz – 0.02 G^2/Hz
500Hz – 0.02 G^2/Hz
2000Hz – 0.0013 G^2/Hz
Sine tones at
F1=1.3G at 17Hz
F2=1.1G at 34Hz
F3=1.3G at 68Hz
F4=1.0G at 340Hz
I need to convert this sine on random profile to random only profile so that it can be compared against other random profiles.
Any help would be greatly appreciated.
Alex
4Hz – .0008 G^2/Hz
100Hz – 0.02 G^2/Hz
500Hz – 0.02 G^2/Hz
2000Hz – 0.0013 G^2/Hz
Sine tones at
F1=1.3G at 17Hz
F2=1.1G at 34Hz
F3=1.3G at 68Hz
F4=1.0G at 340Hz
I need to convert this sine on random profile to random only profile so that it can be compared against other random profiles.
Any help would be greatly appreciated.
Alex





RE: Converting Sine on Rendom to Random only profile
.04 G^2 rms/Hz. The slopes at each end of the spectrum are 3 Db/Oct.
Regards
Dave
RE: Converting Sine on Rendom to Random only profile
10Hz - 0.02 G^2/Hz
28Hz - 0.02 G^2/Hz
40Hz - 0.04 G^2/Hz
2000Hz - 0.04 G^2/Hz
I was asked to determine if this system would survive under “Sine on Random” profile listed in the first thread. So what I would like to do is to see which of the two profiles is more severe.
From my understanding I first have to make two profiles equivalent. To do that I have to convert “Sine on Random” to “Random” profile by converting Sine tones to equivalent [G^2/Hz] and then add it to existing PSD profile. Then I’ll be able to compare PSD levels between two profiles and see which one is higher in magnitude at a specific frequency.
Regards,
Alex
RE: Converting Sine on Rendom to Random only profile
Rather I would use a vibration response spectrum approach, with some thought given to histograms.
Tom Irvine
www.vibrationdata.com