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Bicycly Stem Topology Optimization Tutorial Error # 2148

Altair Forum User

Hi everybody,

I tried to do the 'Bicycly Stem Topology Optimization Tutorial' from the Learning Library of Hyperworks.

Following the steps according to a Youtube optimization tutorial, the following error occurs:

*** ERROR # 2148 ***
Invalid design problem.
All the sensitivities of response 1 (objective) are zero.

How can I solve this one?

Cheers,

Alexander

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GirishM

Hi Alexander,

Look at your linear static results and make sure you see some displacements, if not, check your load step and make sure you assigned the loads correctly.

Girish

Altair Forum User

I controlled the load step and assigned the load correctly. However, the error stills occurs.

I would expect the error to be in the optimization objective...

Attached I shared the model I've set up. Maybe someone can help me with this.

Unable to find an attachment - read this blog

Altair Forum User

Update: I checked the optimization response and the load step was not applied. However, when I want to check the box (as displayed in the attached screenshot) and klick return, this is not saved. So when I reenter the loadstep and try to apply it to the compliance, the box is still unchecked.

Why does the software not allow me to apply the loadstep?

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

Simon Križnik

Hi Alexander,

after checking the box, click return and then click update in the responses panel.

What is the point of using weighted compliance with only one loadstep?

Altair Forum User

Hi Alexander,

In your model, the yellow and green components are not attached. There is some clearance in between the components. Kindly correct this and try again.