The SUBCASE ID in ATT1 field of DRESP1 does not refer to a modal FRF subcase.

Hey 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