How to create / define Rigidbodies in Optistruct

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

Hallo Team,

 

I am using Optisruct 2017.2 for Transient Analysis and I request your help for the following problems:

1. My model contains bearings, for which i need to assign/create as rigidbody. How do I create?

2. Is transient analysis be performed in Optistruct?

 

Thanks in advance.

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Answers

  • tinh
    tinh Altair Community Member
    edited March 2018

    1.Did you try using 1d>rigid

    2.Yes, you can refer to OS reference guide examples OS-1310, OS-1315

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

    Hi Tinh,

     

    Thanks for your reply.

    1. I haven't tried using 1D's. I created using Rigidbodies ( RBODY ).But I am facing problems with ref.node. in PRBODY card.

    2. I will go through the above mentioned tutorials.

     

    Regards,

    Rajasekhar

  • tinh
    tinh Altair Community Member
    edited March 2018

    As I looked up OS reference guide, PRBODY is used for Multi-Body Simulation

    maybe it's not suitable for Transient Analysis

     

    panel 1d>rigid will create RBE2 binding all nodes of the bearing component, it will become rigid

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

    1. I haven't tried using 1D's. I created using Rigidbodies ( RBODY ).But I am facing problems with ref.node. in PRBODY card.

     

    Hi Rajashekar,

     

    Could you please let us know what are all the problems you are facing with RBODY in OptiStruct?

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

    PROBDY is used to do the Multi-Body Simulation.

     

    Maybe you can share the file for us to try RBE2 elements.

     

    It is a method about MPC constrained.

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

    Hi Prakash,

     

    For example : My model consists of Radiator fan assembly.

    Parts in the assembly : Fan+Spindle+Bracket

    I have to Analyse the Bracket in transient case.

     

    image.png.eccf6728a0ffc68fb2ebbe4710d69fe6.png

    >> bracket and spindle are connected through bolts/screws

    >> I considered Fan as rigid, since it is not my area of interest.

    >> Modelling rigid : Rbodies

    create element/node set for the Fan

    now create RBODY

    assign the element / node set of fan in ELEMENT sets

    I have selected node1 as my ref node

    load steps, controls cards are defined.

    Try 1 : for ref node1 >> my solution says RUNNING. If I check the run status after 1 hr, It still says RUNNING but i my OUT file shows as in pic attached below.

    Try 2 : for ref node2 >> i got the results

    Try 3 : for ref nodes 3, 5, 4 >> same scenario as in TRY1

     

    So what is the criteria for ref node selection for RBODY???

    image.png.b4398769f736f83bd30b2be510905b43.png

     

    Regards,

     

    Rajasekhar

  • tinh
    tinh Altair Community Member
    edited March 2018

    Note #6 of RBODY card:

    if you provide Ref node, please provide mass

    otherwise, do not provide ref node

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