Bicycly Stem Topology Optimization Tutorial Error # 2148
Altair EmployeeHi 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
Answers
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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
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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.
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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"?>
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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?
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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.
<?xml version="1.0" encoding="UTF-8"?>
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Hi everybody,
Ivan: This is what I did, but it doesn't work.
Prakash: I followed your advice using contact surfaces, but the error remains.
Regards,
Alexander
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Hi Alexander,
Delete the RBE2 where load is applied, Recreate and apply the load again.
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<?xml version="1.0" encoding="UTF-8"?>
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Hi everybody,
I followed your advice and deleted and reapplied the load but it still does not work.
This time its the error # 312 that occurs.
I shared the model, maybe someone can help me. Thanks a lot...
Regards,
Alexander
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Can you try this model?
The attached model runs for me without any errors.
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Hi Prakash,
it worked and I can see the optimization result. Thanks a lot.
What exactly did you change in the model?
Regards Alexander
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Hi Alexander,
Re-Created the loading RBE2 as it is not connected to any nodes...
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