Non-linear Modal Analysis

Arul
Arul Altair Community Member
edited October 2020 in Community Q&A

How to conduct Non-linear Modal analysis ?

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Answers

  • gopal_rathore
    gopal_rathore Altair Community Member
    edited November 2016

    Hi Arul,

     

    Normal modes analysis or modal analysis needs to be carried out in optistruct and the basic output is the eigen frequency or natural frequency of the system based on either constrained system or unconstrained system. Now coming to the non-linearity case, where in the system you have non-linearity, is it due to friction,material properties,damping,non-linear spring properties etc. 

    I think these parameters can be included during normal modes run itself in optistruct and as we do not consider the displacement values during modal run non-linearity due to geometry can be avoided.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi Arul,

     

    It is not possible to run a normal modes analysis with non-linearity. But depending on the use case, you can run a preloaded normal modes analysis and the preloading subcase could be nonlinear. 

  • Arul
    Arul Altair Community Member
    edited November 2016

    Thanks

  • Arul
    Arul Altair Community Member
    edited November 2016

    Hi Prakash,

     

    Is it possible in Radioss?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi Arul,

     

    Not at the moment. We will let you know when this feature is available.

  • Arul
    Arul Altair Community Member
    edited November 2016

    Thanks 

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