Saving and Retrieving Normal Modes Analysis Results

Subhu_21017
Subhu_21017 Altair Community Member
edited October 2020 in Community Q&A

Hello Everyone!

 

I am doing a response spectrum analysis an like to retrieve a eigenvalues and vectors from normal modes analysis which has already done. I hav saved the eigen value using  EIGVNAME = modes and  EIGVSAVE = 100. The file is has saved as modes.100.eigv.

While doing RSPEC, I retreived the eigv using EIGVRETRIEVE = 100 and same EIGVNAME. But Solving throws an error as,

 

  
  *** ERROR # 372 ***
  Number of MPC constraints in file modes.100.eigv 474
  does not match current value 0.

 

Can Someone figure it out .

 

Thanks in Advance

 

-RathinaVel

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited January 2017

    Hi Subhu,

     

    Make sure you have requested enough modes to save in EIGRL card.

  • Subhu_21017
    Subhu_21017 Altair Community Member
    edited January 2017

    To add a point, I have created 79 pretension bar elements. 

    In modal Anlaysis, I have found the preloaded/ pre stressed modes.

     

    This 79*6 = 474, is doing something, that I am un able to figure out.

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited November 2020

    FYR i have attached fem file. Analysis of a Preloaded Bridge Model with Pretension.

    Unable to find an attachment - read this blog

  • Subhu_21017
    Subhu_21017 Altair Community Member
    edited February 2017

    Hi Rahul, 

     

    Thanks. But I have no problem in solving modal analysis with preload.

     

    I have to do a response spectrum analysis, for which I have to use the preloaded modes.

    I have saved the eigv file on the modal analysis. On retrieving the file using Eigen retreive in RSPEC analysis throws an error as I mentioned above.

     

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