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

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

Hi @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. 

hi im getting this error plz help me out

Unable to find an attachment - read this blog

Hi @rahul rao

Make sure you are selecting loadstep for frequency response when creating objective/Dconstraint function and not when creating the frequency response itself. 

<?xml version="1.0" encoding="UTF-8"?>

i am selecting load in loadstep

Rahul

Dont select when creating response. instead select when you create objective or constraint. 

when i do not select load step in response option then it is not creating a response 

Hi Rahul,

Can you share the model file?

Sorry, i cannot share the file.

@rahul rao

I am able to create frequency response without selecting any load step

Delete the existing and recreate another one. 

HOW R U CREATING THAT? CAN U TELL THE STEP BY STEP PROCESS...

@rahul rao

Responses>> FREQ>> Provide a name>> enter the mode number>> do not select loadstep>> click create

ok i can send u this file with same inputs for topography optimmiization

Rahul,

try this file

P,S: let me know once you are done with downloading. I will delete the file.

what happened ?

/

done downloaded

how you unselected the load in response of frequency?

yes, you can check in the entity editor. 

<?xml version="1.0" encoding="UTF-8"?>

this is error i got when i ran  the file which u gave me

Unable to find an attachment - read this blog

Rahul,

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. 

ok i try this