How to use ESLM correctly in OptiStruct software

Description:

Why do I keep receiving a warning that the corresponding setting cannot be recognized after I enter 'DOPTPRM, ESLM, YES' in the .fem file and then reopen the model file? How can I use ESLM correctly in OptiStruct? Does it have anything to do with the load cases set up in my model? Can this method be applied to random vibration?

Product/Topic Name :

How to use ESLM correctly in OptiStruct software

*Note from Community Team - Once you receive a satisfactory answer on your question, kindly mark your answers as "Accepted" so it can help others with similar problems. Thanks.

Find more posts tagged with

OptiStruct

v2020.0

v2022

Accepted answers

Rajashri_Saha

ESLtransient.pdf

Bracket_mtran.fem

You can refer the attached document and fem file.

All comments

Rajashri_Saha

Hi,

ESL is supported for Transient analysis mostly. The card you have mentioned is an unsupported card.

Thanks

Rajashri

Rajashri_Saha

ESLtransient.pdf

Bracket_mtran.fem

You can refer the attached document and fem file.

Yujia_11

Thank you for your reply.I would like to kindly ask whether you have any detailed tutorials or relevant reference materials regarding the use of the Equivalent Static Load Method (ESLM) in the OptiStruct software that I could study. Thank you again for your assistance.

Rajashri_Saha

Hi,

You can refer below link for theory part.

https://help.altair.com/hwsolvers/os/topics/solvers/os/opt_composite_equiv_static_load_method_c.htm?zoom_highlight=eslm

Also you can find tutorial in help page, but unfortunately all are related to MBD.

https://help.altair.com/hwsolvers/os/topics/solvers/os/optimization_with_eslm_example_problem_intro_r.htm?zoom_highlight=eslm

Thanks

Rajashri

Yujia_11

Hi,

I apologize for troubling you once more. If I wish to carry out an impact test simulation within the OptiStruct software, and then utilize the Equivalent Static Load Method (ESLM) for topology optimization design of composite materials, would this be achievable?

Thanks

Yujia_11

Hi, when I open the .fem file you shared, I still get this warning that DOPTPRM cannot be recognized. May I ask whether this is due to a version issue or some other reason? Thank you for your reply.