Frequency response analysis

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

I am trying to do frequency response analysis of a beam (2-d) but i am getting error saying 

*** ERROR # 291 ***
 Output results for Frequency Response, Transient Analysis and Random
 Response are only requested at grids that have been constrained out. 
 Note that displacements and stresses are disabled by default for such 
 loadcases. Also note that the amount of results for such loadcases may 
 be extremely large, and therefore output SETs are highly recommended.

Can some one help me with this?

I have attached my model file with this post.

Unable to find an attachment - read this blog

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Hi @Swapy

     

    Constraint the node where you are applying unit load with SPC for same DoF as unit load.

     

    Why have you constrained the entire plate in Z-drection?

    This may not help extracting modes. Consider this.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Thanks for the reply Prakash 

    I want to constraint my vibrations in Only X_Y plane (2D), so i have i have constrained entire plate in z direction

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2016

    Swapy.

     

    OK. But I think this will error out if you are restrict the mode towards Z axis. Give it a try.

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