topology optimization
Altair Employeewhat can be the different reasons for getting 'INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED)' error
Answers
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Hi Sahil,
Looks like one of the constraints is not working with the model/problem. Can you paste the out file to check which constraint is violating?
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hi Prakash,
thanks for the response,i overcame that problem. the model is now feasible ,but the problem now is that the material reduction is not appropriate,PFA the model and mention any changes /improvements
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Hi Sahil,
What do you mean by not appropriate, can you please explain?
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by appropriate i meant,it is removing material from places where by practical experience i can definitely say it shouldn't .
i am also doubtful about the constraints i have applied ,in this model as the axis of rotation is neither x,y nor z . so which DOF should i select in the constraints panel.
the largest hole has to be bolted,which will prevent its translation motion,but will only allow rotation about an axis (marked in image )
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Sahil,
What makes you think the results are wrong?
There is more material where the load is more which makes sense. Maybe you should play a little with manufacturing constraints.
Altair Forum User said:in this model as the axis of rotation is neither x,y nor z . so which DOF should i select in the constraints panel.
The best way is to orient the model such that the hole axis is alligned to any of global axis.
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Can you please tell the procedure, how to allign the model with respect to the global axis in hypermesh.
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Hi Sahil,
I guess you are using the part aligned with the car axis. If you know the angle you could go to (Tool - rotate)
Select the component (if the mesh is in the same component as geometry) and then rotate the same as the angles you get from the car system.
The easiest way, I think, is to align the part in the CAD model from the start. It's easier to play in the CAD program then in the HM.
Another thing, try first a simpler SHELL model to play with manufacturing constraints of the topology optimization and then if you see the need try with the 3D elements.
Hope it helps,
Best regards,
Gonçalo
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Altair Forum User said:
Can you please tell the procedure, how to allign the model with respect to the global axis in hypermesh.
The best way is to get the angle from CAD and rotate using ROTATE option in HyperMesh.
go to Tools Page>> Rotate>> Elements to rotate by a specific angle.
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