HyperMesh 2019 - Modal Transient Dynamic Analysis with Acceleration vs. Time Load

MaL2K16
MaL2K16 Altair Community Member
edited October 2020 in Community Q&A

Hello everyone,

 

I am conducting a modal transient dynamic analysis and would like to ask if it is possible to input this acceleration vs. time data into a 'TABLED1' load collector, or if there is a specific load collector that is used for acceleration data. I have looked online for tutorials and it seems 'TABLED1' is only for displacement data, so I would like to know if this is the case. I have created the data in HyperGraph, and was also able to create it using the built-in 'Curve Editor' in HyperMesh 2019 (although since I have more than 10000 data points the Curve Editor window doesn't open, so I can't show it here).

 

I have the geometry, mesh, SPCs, materials, and properties all ready to go...it's just that defining the dynamic load that is giving me issues.

 

Ground motion 1:

<?xml version="1.0" encoding="UTF-8"?>1126171930_GroundMotion1.thumb.PNG.1572572390100c6f4396ffa30489ad64.PNG

 

Ground motion 2:

<?xml version="1.0" encoding="UTF-8"?>295932913_GroundMotion2.thumb.PNG.bec20275238a7e3d679bf60206f3cece.PNG

 

Again, thanks for your help!

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Answers

  • PrasannaK
    PrasannaK
    Altair Employee
    edited January 2020

    Hi,

    You can add the acceleration vs time data in TABLED1 card (it just accepts x and y value which can be disp or acc or other). Create TLOAD1 where you can specify that the data is acceleration. Please find attached:

    1. The screenshot  which shows the type should be 'ACCE'

    2. Tutorial: Modal Transient Dynamic Analysis for your reference (note that is does not elaborate analysis using the acceleration data)

    Thank you

     

    TLOAD1.JPG

     

     

    Unable to find an attachment - read this blog

  • MaL2K16
    MaL2K16 Altair Community Member
    edited January 2020

    Hi Prasanna,

     

    Thank you very much for the help!

     

    I would also like to ask another question: my acceleration excitation and my SPC constraints are at the same location - I am trying to model the scenario where there is a shake plate underneath the tower:

    <?xml version="1.0" encoding="UTF-8"?>2043711101_DesignTower2.thumb.PNG.695f0e7f7fc425cc1905589f9073623e.PNG

     

    The tower is fixed connected to the shake table, but the excitation is applied to the shake table, and hence the bottom nodes of the tower... how would one model this interaction in HyperMesh? I can't run the analysis.

     

    Thanks again!

  • PrasannaK
    PrasannaK
    Altair Employee
    edited October 2020

    Hi,

    I saw your post: 

    https://community.altair.com/community?id=community_question&sys_id=2076043a1b2bd0908017dc61ec4bcbd3

     

    I am working on it and will get back to you asap.

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