Optistruct

Mahantesh
Mahantesh Altair Community Member
edited March 2022 in Community Q&A

ERROR # 410 ***
 Specifying lower bound in EIGRL card may compromise RESVEC quality.
 Subcase ID 1          EIGRL ID 2.
Hi,

     I am facing above problem for FRF analysis can u pls help me to solve above problem

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2017

    Hi @Mahantesh

     

    Add Control Cards>>PARAM>>LFREQ  hereby modes with frequencies less than LFREQ are not used in Modal Frequency Response and Modal Transient Analysis.  

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Hi @Prakash Pagadala,

    When I use this card, I have another message :

     

    Mode eliminated by:
      M - Modeselect card for at least one subcase.
      L - PARAM, LFREQ/FL when MODESELECT card is not active.
      H - PARAM, HFREQ/FL when MODESELECT card is not active.
      S - LFREQ/FL, HFREQ/FL, or MODESELECT depending on the subcase.

     

    Should I add another card?

     

    Thank you!

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Hi @Alina

     

    Can you share the entire .out file please?

     

    When you add LFREQ card, you need to specify the frequency within which modes are removed. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    @Prakash Pagadala,

    There are my .out file and my .fem file.

     

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Hi @Alina

     

    Is there a reason for having LFREQ?

     

    Since you set V1 from 0 which is lower bound on EIGRL card, you don't need a LFREQ. 

     

    If the lower bound is set to a non zero value, in this case you can use this card. 

     

    The message you see is just for information on which modes are removed and by what means. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    Yes, I'm sorry if it was not clear. I have a rigid body mode below 1Hz and I dont want to have it and when I try to change the lower limit in the EIGRL card I have an error message. I do a Squeak analysis after and this rigid body mode is not welcome.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2017

    @Alina

     

    OK, so you have used LFREQ to skip the rigid mode. 

     

    Anyways, the message provides information and nothing to do with the results. 

  • Gauri Mandekar
    Gauri Mandekar Altair Community Member
    edited March 2022
    Altair Forum User said:

    Hi @Alina

     

    Is there a reason for having LFREQ?

     

    Since you set V1 from 0 which is lower bound on EIGRL card, you don't need a LFREQ. 

     

    If the lower bound is set to a non zero value, in this case you can use this card. 

     

    The message you see is just for information on which modes are removed and by what means. 

    Hey I am getting error of 410 in modal frequency response analysis. Cause the eigrl v1 value is 1 so as you said i used LFREQ with value 1.. But still I'm getting the same error..what should i do ? Could you please help me????

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