The SUBCASE ID in ATT1 field of DRESP1 does not refer to a modal FRF subcase.
Altair EmployeeHey guys,
I am conducting a topology optimization with an eigen mode subcase. The analysis works fine. However, when setting a topology optimization the following error is given:
The SUBCASE ID in ATT1 field of DRESP1 1 does not refer to a modal FRF subcase.
The model setup is pretty much exatly the same to the tutorial: OS-2020: Increasing Natural Frequencies of an Automotive Splash Shield with Ribs.
Can you give me a hint why this error occurs?
Cheers,
Mike
... I am working with HyperWorks 2017
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Altair EmployeeHi @nipundahra
Which version of Hyperworks are you using?
This is a bug in 2017 and is fixed in 2017.2 which will be released soon. You can run the same in older versions instead.
Altair EmployeeAltair EmployeeHi @rahul rao
Make sure you are selecting loadstep for frequency response when creating objective/Dconstraint function and not when creating the frequency response itself.
Altair Employee <?xml version="1.0" encoding="UTF-8"?>
Altair Employeei am selecting load in loadstep
Altair EmployeeRahul
Dont select when creating response. instead select when you create objective or constraint.
Altair Employeewhen i do not select load step in response option then it is not creating a response
Altair EmployeeHi Rahul,
Can you share the model file?
Altair EmployeeSorry, i cannot share the file.
Altair Employee
I am able to create frequency response without selecting any load step
Delete the existing and recreate another one.
Altair EmployeeHOW R U CREATING THAT? CAN U TELL THE STEP BY STEP PROCESS...
Altair Employee
Responses>> FREQ>> Provide a name>> enter the mode number>> do not select loadstep>> click create
Altair Employeeok i can send u this file with same inputs for topography optimmiization
Altair EmployeeRahul,
try this file
P,S: let me know once you are done with downloading. I will delete the file.
Altair Employeewhat happened ?
/
Altair Employeedone downloaded
Altair Employeehow you unselected the load in response of frequency?
Altair Employeeyes, you can check in the entity editor.
<?xml version="1.0" encoding="UTF-8"?>
Altair Employeethis is error i got when i ran the file which u gave me
Altair EmployeeRahul,
You are trying a topography optimization. I would suggest to use frequency as either objective or constraint and use volume or mass as other response.
Though mass and volume will not reduce drastically, but it will support.
Altair Employeeok i try this
Hi Mike,
I am facing the same problem. I wanted to ask if you were you able to overcome this problem and if yes,can you please explain how?
Cheers,
Nipun