How perform a Modal transient analysis?

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

Hi everyBody

I have a steel frame with a steel plate in the centre, with applied a pressure load; at the exteems of frame i have 4

 

constrains locking DOF1 DOF2 and DOF3;

 

I have used beam element to create the frame and shell elements to create the plate;

 

I have applied a certain pressure on the shell elements, but i need a impulsive load, how can i create it?

 

How can i perform a transient modal analysis? witch load collectors i need to create?

 

Here there are three images to help you to understand.

 

After that i have to output the values of bending moments, shear and normal stress near a intersection of

 

3 beams element in the frame; then model the intersection with a 3D and apply the loads i have found from

 

the transient  modal Analysis.

 

Where can i reed these kind of values concerning a node of the frame?

 

thank for the support

 

Damir

 

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited March 2015

    Have you seen this tutorial in the help documentation already?

     

    OptiStruct > OptiStruct Tutorials and Examples > Tutorials > Advanced Small Displacement Finite Element Analysis:



    OS-1315: Modal Transient Dynamic Analysis of a Bracket

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi and thanks

     

    yes Sir, i have seen it, but i don't know how to behave in my case, for example

     

    in my model  need to apply a impulsive pressure of   - 0.0075 Mpa in Y direction; should i do the same thing of the 

     

    example?

     

    -Define loadcollector DAREA

    -Define constrains on plate's nodes, with DOF2 = -0.0075 and select load types >DAREA 

     

    and then define all the others collectors like in the example?

     

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi Damir,

     

    Please go through TLOAD1 details in OptiStruct which can answer your question.

     

    Maybe in your case you have to reference PLOADx in the TLOAD1 card.

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  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Thank You Prakash

     

    i'll try to sett the analysis in this way...

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited March 2015

    Hi prakash

    i understand what you say me, about:

    What you can do is create a set with the nodes of interest and request normal, shear stresses for that particular set.

     

    To request specific output, goto Analysis page>> Control cards>> global output request>> Stress >> change type to SHEAR

     

    But my frame is CBEAM elements based, so 1D mesh; is possible to output the nodal stresses in this kind of mesh?

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