Can i apply torque for a defined time?

Luis Angel Vázquez Morales_20662
Luis Angel Vázquez Morales_20662 New Altair Community Member
edited August 2022 in Community Q&A

Hi, I am applying torque to a piece, i know that optistruct from default applies the torque for 1 sec for the simulation. My question is: There is some way i can apply the torque for 20 sec for example? Or do i have to change to RADIOS? Thanks.

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Answers

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited August 2022

    Hi @Luis Angel Vázquez Morales 

     

    A few comments:

    OS by dafault runs implicit method, and in general, for NL analysis it will use load increments, and apply your forces/torque from 0 to 1.0 load increment, starting from 0.0 to 100% of load, not time. These are typically STATIC analysis, or quasi-static, where the load is slowly increased, and no dynamic effects are accounted.

    So, by default, it is not a time varianting load, per say.

     

    You can control this for linear and non-linear subcases, if you are running a Transient analysis, and then you will have time varying loads, as a curve of load vs time, and dynamic effects can be considered.

    There are a few tutorials on linear and non-linear transient analysis in the Help of OptiStruct.

     

    You could indeed run this in Radioss, BUT for such a long period such as 20s, it would be pratically infeasible for Radioss, as typically we are talking about timesteps of order of 1e-6s.

     

    But before going to Transient, whatever solver you're using I'd try to understand better if it is really needed to take time in consideration, or not. Is there really transient effects in your case, or would it be a quasi-static situation?

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