FEA with grav acceleration and mass point

Henry26
Henry26 Altair Community Member
edited October 2020 in Community Q&A

Hello everyone,

I'm performing a FEA with gravity acceleration as load case and a point of mass concentration located at CG. I linked this point of mass with RBE3 in all inner surface of the componente. My doubt is: Is it correct link this point of mass only in inner surface? Or should I link that with others surfaces, like outer surface.

Thanks in advance!

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2018

    Hi @Henry26

     

    What is the model about?

     

    How is the concentrated mass is connected to rest in reality?

     

  • Henry26
    Henry26 Altair Community Member
    edited March 2018

    Hello @Prakash Pagadala,

     

    It's a FEA in a transmission for vehicles. So, instead of using all the componentes with the respectivity density and in order to simplify the analysis I've used a point of mass in a RBE3 linked to the inner surface of the housing. In this way, I put a mass point concentraition at CG and then applied a vertical gravity acceleration. I know that if I use all the density of each component I will have a better result, but I'd like to know the influence of the simplification and because this I'm looking for a way to perform this analysis.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Hi @Henry26

     

    I think there will be a slight difference in the results. Here is a simple model study with and without connecting outer surface.

    Unable to find an attachment - read this blog

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