Optistruct error messages

Rahul_P1

I am using the student edition of Hyperworks v11.

Having followed and adapted a tutorial

'OS-2010: Design Concept for an Automotive Control Arm'

I came to the final stage, to run the optimisation and received this error message.

Error #6060

The properties referenced by DTPL card 1 are not referenced by any designable element(s).

Going into design variable card edit to find the dtpl card I have:

DTPL 1 PSOLID 1

In property I have design_prop and nondesign_prop

these have the cards

PSOLID 1 1

PSOLID 3 1

My assembly is made up of 2 components, one has the design_prop property assigned and the other non...

SO! what is the problem with running the optimization, and can you give me any things to look at to try and solve this problem?

Thanks.

Rahul_P1

Hi

For your analysis, as you describe you must have exactly two properties (ids 1 and 3), one assigned to the designable component and the other assigned to the non designable component. The property assigned to the designable component (id 1) must be the property referenced in the dtpl card (id 1). I see that this is exactly what you describe.

Firstly please confirm you have exactly two properties only, I see that your first property has the id 1 and the second property has the id 3 is there a property of id 2 in your model?

Please go to delete > change the entities to property > click on preview unused > look at the status bar > if it says 1 property unused > this could be the problem > click on delete and delete this property.

Go to tools > renumber > and renumber all the entities.

If the above does not solve the problem

Please attach your model in the next post so I can investigate further, if the model is confidential use the secure file dropbox in my signature below.

Rahul_P1

Hi s.o.clifton,

The problem is that this model is made of shell elements of the plotel type, plotel is not a valid element for any analysis and shell elements require the pshell property not the psolid in your model

You have two options of modeling a structure like this for analysis or optimization,

You can either extract a midsurface of the geometry and then shell mesh it with an optistruct element type such as cquad 4, in which case you will use pshell property and reassign the designvariables with respect to the pshell properties.

You can volume mesh the solid geometry with hexa elements or tetra elements , in which case you can just use the same psolid property you have and not really change anything.

I would suggest you start with a tetramesh using volume tetra, just delete all the elements in your model and go to tetramesh > volume tetra and then tetramesh the geometry,
make sure you reassign the properties to the components after you tetramesh, I assume the bike part will be assigned design prop and not otherwise as in the model.

refer to - HyperWorks Desktop Applications > HyperMesh > HyperMesh Tutorials > Meshing > 3-D Elements:
HM-3200: Tetrameshing
refer to - Training Altair University > STRUCTURAL > MODELING > Meshing > 3D > Tetra Meshing

http://training.altairuniversity.com/structural/modeling/meshing-2/3d/tetra-meshing/

Training Altair University > STRUCTURAL > MODELING > Meshing > 3D > Tetra Meshing > Tetrameshing of a Steering Wheel and Analysis Set-up