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Problem to perform a Random Vibration Test

Question asked by Xavier Laurand on May 30, 2017
Latest reply on May 30, 2017 by Ryan Dark

Hello everyone !

 

Let my introduce my self, my name is Baptiste TROTABAS and I have to perform a Random Analysis for my school project

So, to make this, I launched a new simulation study > linear dynamic > Random Vibration

After that, a wrote my excitation curve :

Frequency --- PSD

           5 Hz --- 0.040 (g²/Hz)

      100 Hz --- 0.20 (g²/Hz)

      500 Hz --- 0.20 (g²/Hz)

    2000 Hz --- 0.040 (g²/Hz)

And I obtained this curve :

                                    Curve.PNG.

Then, I defined a global damping as :

global damping.PNG

 

Finally I launched the Random test but I obtained this error message :

pb.PNG

I tried to perform this analysis without a curve, but with a constant value (=1) and it was a success.

Hence, I tried in additionning more points : we can consider my curve as 2 linear functions.

Thus I determined values regarding to a frequency [ f(20hz) = 0.040 & f(50hz) = 0.20 => f(30Hz) = a.x + b, and so on.. ]

Now I have the same curve as previously, but describe with 2800 points.. However even with this, analysys doesn't work..

 

Do you know, how perform correctly this analyse ?

 

Thank you by advance !

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