Learning Forum

[BALA]

Hello all,

1.when we see the output quantities like von mises stress contour plot in random vibration as like in Harmonic we can see this value at perticular frequncy but in Random vibration is not availble due to randomness of input, so does it mean its an average or RMS value for given PSD spetcra? (bit confuesed with 1 sigma, 2 sigma , 3 sigma and RMS)

2. When we see the Acceleration Response PSD output at any location in terms of G, it gives RMS value with graph showing energy content over PSD, as i have checked that directional acceleration values shown In contour plot with 1 sigma are equal to the RMS values shown in Response PSD.  Does it mean the 1 sigma  directional acceleration value from contour plot is  nothing but GRMS value for given location?

[mohan.urs]

Hey Bala,

Check out this course video from Ansys How to Correctly Interpret PSD results| Ansys Courses . It answers both your questions and it will also help you to gain more understanding on PSD analysis results.

Thanks and Regards,

Mohan Urs

[BALA]

Thanks Mohan, for your reply. I have seen this video, 1 sigma is 1 RMS is mentioned in that video but my first doubt is still uncleared can you please provide a insight on that?