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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

Nachiket Kadu

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  1. Hello Prashant Sir Any solution for the said problem yet?
  2. Hi Sir I have attached the out file. Please help me out with the issue. Email Id: arun_venkatesh.t@lmw.net.in Guide_tube_mat_law_0001.out
  3. Hi I am trying a quasi static simulation in Radioss. My final time is around 1.1 sec. The simulation run good till 0.5 secs but after 0.5sec with increase in pressure the components just penetrates and crosses over another component. Can anyone help me with this regards?
  4. Energy error of around 40%

    Hi George Yes, Agreed! Thats why i gave stress strain curve for mat law 69. But the model seems to penetrate with other components.
  5. Energy error of around 40%

    Hi George I have doubt regarding change in material law. For the same simulation if i give Mat law 69 instead of mat law 42, the simulation animation results shows weird behavior. With same contact condition if u change the MAT law why this behavior is observed.
  6. Energy error of around 40%

    Hi George I got your point, i did some changes and now energy error as well as dynamic effect which we were talking has been neutralized. Thank you for your suggestions.
  7. Energy error of around 40%

    Hi George Anything you can suggest to counter this problem?
  8. Energy error of around 40%

    Hi George Also if you change Istf back to 4 the model behaves normally under initial pressure, but with high contact energy.
  9. Energy error of around 40%

    Hi George It starts to behave abnormally after few steps not at start itself. Moreover i ran this case in my previous model it worked well and the only problem i was facing was high contact energy. So to first encounter the problem of contact energy i gave pressure value from 0.05 sec as initial pressure will increase internal energy and so the energy error.
  10. Energy error of around 40%

    Hi George Glad that initial contact energy is reduced, but as u can see in rad file ,for pressure i gave tabled value from 0.05 sec as 0.21. The reason for giving this was to first eliminate the contact energy error exclusively. But now when i give pressure from initial point itself i.e. from 0, the animation will show you bizarre results. i have attached screenshot for changes made.
  11. Brake Squeal Analysis using Optistruct

    Hi It is already available in optistruct tutorials under help. OS-1371: Brake Squeal Analysis of Brake Assembly
  12. Energy error of around 40%

    Hi George Thanks for resolving query for nature of graph. I hope you will update me regarding energy error soon.
  13. Energy error of around 40%

    Hi George I have another query, while i am plotting any graph be it energy or the force, the nature of graph is not smooth. It is have having lots of crests and trough. Can you suggest me something for smoothing i already have applied Time history O/P freq as 0.0001. I have attached a force curve for your reference. The black curve denotes what i am expecting.
  14. viscous damper

    Hi You can use CBUSH which defines a generalized spring-damper structural element. I hope this is what you are looking for.
  15. Energy error of around 40%

    Hi George I have sent you the files.