doubt regarding mbd card in optistruct

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I am trying to find natural frequency and displacement time graph of a two degree of freedom spring mass system in optistruct. I used eigen card and did normal mode analysis to find natural frequency but for displacement time I am using MBD card. I have defined prbody for m1 and m2 and ground body and used celas1 and applied mass through conn2. Error I am getting is no body for celas element. How to create body for it? Please tell me if there exists any tutorial regarding this

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    Hi Alekh,

     

    Why do you want to use a MBD entity in OptiStruct for modal analysis?

     

    I think this is not supported for Eigen value problems. You may have to think about remodeling. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    No I have used model analysis for finding out natural frequencies but  now for getting displacement time graph I am using MBD

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2017

    Hi Alekh,

     

    I am sorry I did not understand what you are trying to model.

     

    But PFBODY is used for multibody simulation in OptiStruct.

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