Optistruct

Mahantesh

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

Altair Forum User

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

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

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

@Prakash Pagadala,

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

 

Unable to find an attachment - read this blog

Altair Forum User

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

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

@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

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????