How to perform a sine-on-random vibration analysis in Ansys Mechanical ?

- November 23, 2023 at 7:20 am
  
  balaji.bp
  Subscriber
  
  I need to perform sine on random analysis, as ansys has no direct provison to perform these. From my own search, i found thatthere is indirect ways, first is to add sine tones to Random Vibration PSD curve and use this equivalent PSD in analysis, and second one is to Perform a separate harmonic response and random vibration analysis and convert the harmonic response results to “RMS”” values. Then statistically add the RMS results from the harmonic analysis to random vibration results.
  Can anyone guide for performin any one out of these above methods, my vibration profiles are given below.
  Sine Tones
  Broadband Spectrum
  Freq(Hz)
  Amp(g)
  Freq(Hz)
  Amp(g²/hz)
  f1
  3.5
  A1
  0.0972
  10
  0.002
  f2
  17.5
  A2
  2.625
  100
  0.02
  f3
  35
  A3
  3.75
  300
  0.02
  f4
  52.5
  A4
  2.25
  500
  0.002
- November 23, 2023 at 1:19 pm
  
  Ashish Khemka
  Forum Moderator
  
  Hi Bala,
  Generally, the input PSD curves are available (say from a design handbook) before performing the analysis. If you have an indirect way of getting the input curve then you may try proceeding with the same.
  Regards,
  Ashish Khemka
  - November 24, 2023 at 6:40 am
    
    balaji.bp
    Subscriber
    
    Thanks for the reply, I think i could not elaborate my problem preperly. I need to apply Sine-on-Random profile as shared in my post also i have attached the graph for same here. As we can see the graph is comibination of both Sine tones and Random Vibration, as in Ansys we can perform Random vibration. I want to know how can i apply this given Sine-on-Random vibration curve?