LIMIT ON ITERATIONS REACHED. INFEASIBLE DESIGN

Hi,
I got the follwing message after finishing Optistruct.
I started it directly from Hypermesh.

LIMIT ON ITERATIONS REACHED.

INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED).

I identified the loadstep which causes the infeasibile design. I hope to fix the problem with creating more Iterations...

Can you tell me how I can increase the limit of Iterations?
I have already looked for solutions but have not found one.

Thank you for your support

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Rahul_P1

Hi,
In OptiStruct, by default the number of iterations carried for an Optimization setup is 30. For few models 30 iterations may not be sufficient to get a converged optimization results.

Follow the below procedure to increase the number of iterations for a optimization run:

• Go to Analysis page and click on Optimization.
• Click on opti control
• Activate the DesMax=
• By default the number in the field next to DesMax is 30
• Give a number above 30 (say 50 to increase the no. iterations to 50)
• Click return to exit the panel
• You can see optimization control in the model browser.
• The number of optimization iterations is increased to 50 from 30.

Regards

Rahul R

Altair Forum User

Hello, im still face the error of

LIMIT ON ITERATIONS REACHED.

INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED).

although i already change the iteration number, may you help me ?

https://onedrive.live.com/redir?resid=ddaa1dbc685dfda2!2983&authkey=!ABrAPSr6Y7UfO8w&ithint=file%2cfem

Altair Forum User

Hi,

Please consider re-creating optimization constraints. The dispalcements in your model is 0.78 and you have give a constraint of 0.07 which may not help.

Try with Minimize compliance and constraining volume fraction.