Space-distributed and frequency dependant loads

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

Hello

I would like to do a stress calculation of a plate subject to a random excitation.

From an external software (Coustyx, boundary element method software via APA) I have the acoustic loading on the plate:


I would like to use this acoustic loading as input load in an Hypermesh model and then ran a frequency response analysis (Optistruct), to eventually calculate stresses.

 

The acoustic loading has the following information:
- node location / node ID (node IDs should be sufficient);
- vertical force vector component (acoustic loading is only along the vertical normal direction, only real component)
- frequency dependence of force vector

This means that I have a spatial grid of force vector for all nodes in my plate for each frequency in my simulation.


I have not been able to enter this information in Hypermesh (I am very new to that).


The problem seems quite basic, it is a random structural response from a diffuse field excitation, which is space-distributed and frequency dependant.
I have read the related Optistruct tutorial; however that does not help dealing with a more advanced input force load such as mine.

Any help? Perhaps via TCL scripting (but again, I have not seen commands to create space-distributed and frequency dependant loads).

 

Thanks

Mathias

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited May 2016

    Did you try via force card.See attached screenshot.

    <?xml version="1.0" encoding="UTF-8"?>XYZ component.JPG

  • tinh
    tinh Altair Community Member
    edited June 2016

    Hello

    I would like to do a stress calculation of a plate subject to a random excitation.

    From an external software (Coustyx, boundary element method software via APA) I have the acoustic loading on the plate:


    I would like to use this acoustic loading as input load in an Hypermesh model and then ran a frequency response analysis (Optistruct), to eventually calculate stresses.

     

    The acoustic loading has the following information:
    - node location / node ID (node IDs should be sufficient);
    - vertical force vector component (acoustic loading is only along the vertical normal direction, only real component)
    - frequency dependence of force vector

    This means that I have a spatial grid of force vector for all nodes in my plate for each frequency in my simulation.


    I have not been able to enter this information in Hypermesh (I am very new to that).


    The problem seems quite basic, it is a random structural response from a diffuse field excitation, which is space-distributed and frequency dependant.
    I have read the related Optistruct tutorial; however that does not help dealing with a more advanced input force load such as mine.

    Any help? Perhaps via TCL scripting (but again, I have not seen commands to create space-distributed and frequency dependant loads).

     

    Thanks

    Mathias

     

     

     

    Hi,

    There is no such command maybe. but you can write a procedure to do that

    - create a  force loadcollector (excite)

    - foreach node, create a force (you already know its xyz components)

    - create a TABLE to vary the force vs freq

    - create RLOAD