error 2148

Altair Forum User

hello,

after I created the temp nodes and apply the forces and run the optiStruct, I received this error

ERROR 2148

Invalid design problem

All the sensitivities of response 1 objective are zero

How can I resolve this problem?

thank you

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Altair Forum User

Hi,

Please check whether there are any free nodes and also check loads and boundary conditions.

If you still face the problem please share the .fem file

Altair Forum User

Hi,

Please check whether there are any free nodes and also check loads and boundary conditions.

If you still face the problem please share the .fem file

hello thanks for the reply

what do you mean by free nodes and how can i check it?

this is the FEM file

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Altair Forum User

Hi @ian

The applied force is not attached to any FE entities (see image below)

Please apply force to the nearest node and try again.

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

Altair Forum User

Hi @ian

The applied force is not attached to any FE entities (see image below)

Please apply force to the nearest node and try again.

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

is there any ways i can apply the force with out the nodes, because i want to apply the force at the exact location (394, 55,410), or how can i attach to the FE ?

Altair Forum User

No, But you can create a node at the coordinate location and create a RBE2 between the nearest node and new node and apply force on that.

Remesh such a way that you get a node exactly at that location.

Altair Forum User

No, But you can create a node at the coordinate location and create a RBE2 between the nearest node and new node and apply force on that.

Or

Remesh such a way that you get a node exactly at that location.

thank you

Altair Forum User

No, But you can create a node at the coordinate location and create a RBE2 between the nearest node and new node and apply force on that.

Or

Remesh such a way that you get a node exactly at that location.

hello i have another question

I am trying to make the component symmetry about the Z axis, I have used the pattern grouping and placed the anchor node at centre, and the first node next to it, however the results component is still not completely symmetric. 4 yellow lines and one yellow line

how can i resolve this problem

thank you

Altair Forum User

How about this, with 2-plane symmetric constraint.

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

Try to make design and non-design spaces, where elements attached to loads and BCs go in Non-design component.

Altair Forum User

How about this, with 2-plane symmetric constraint.

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

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

Try to make design and non-design spaces, where elements attached to loads and BCs go in Non-design component.

hello sir,

how can i find the average element size for the member size control?

tinh

hello sir,

how can i find the average element size for the member size control?

I think optistruct will notice average elem size on output.

If not, try display only the elems and type below commands into command window (menu View>Command Windows)

*createmark elems 1 displayed

hm_getaverageelemsize 1

Altair Forum User

I think optistruct will notice average elem size on output.

If not, try display only the elems and type below commands into command window (menu View>Command Windows)

*createmark elems 1 displayed

hm_getaverageelemsize 1

hello sir,

thanks for the reply, but i don't quite get what you mean (please forgive me i am new to hyperwork). i am looking for the value for MINDIM to achieve the best result. i know that it should be at least 3 times the average element size, but where should i get the average element size.

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tinh

Did you enter the command hm_getaverageelementsize ?

It will return a value

If it does not work with 3d elems I will give you a template to calculate

I am not sure whether an available function to do that or not. But a template is simple

Altair Forum User

Did you enter the command hm_getaverageelementsize ?

It will return a value

If it does not work with 3d elems I will give you a template to calculate

I am not sure whether an available function to do that or not. But a template is simple

it shows

(Documents) 1 % hm_getaverageelementsize
invalid command name 'hm_getaverageelementsize'
(Documents) 2 %

Altair Forum User

Hi @ian

@tinh command works pretty fine.

See the image below and try the same.

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