Learning Forum

[Lucka]

Hi there,

I am a mechanical engineering student. I have already completed the transient structural analysis of a reluctance electric rotor and now I need to optimize its topology but without touch the electromagnetic field optimization. I've added axcess material to the original geometry and i want to lightweight the rotor as much as possible so that i can reach the preset nominal rotational speed and avoid the material yield. That's the reason why I chosed Global Von Mises Stress for Definition of Response Constraint, but i can't obtain any results. I was hoping that the software would have limited the excess material leaving just tiny bridges to sustain the reluctance caves. Can you kindly help me?

I attach some screenshots of what i've done

Thanks

Lucka

[John Doyle]

What happens if you try to minimize compliance as the objective and add a response constraint to minimize the mass and include the max stress limit as a supplemental response constraint? Also, try taking out the maximum amount of mass that you would allow to be removed and rerun the static stress analysis (as a test). nAlso, what is the max stress in the minimum material condition? Perhaps your stress limit needs to be adjusted.n

[Lucka]

Thank you for the answer. I did what you suggested and the software works but removes too little material. In the Topology Density solution i can check that it did just 5 iterations (meanwhile the maximum number of iterations in the Analysis Settings is 500). My stress limit should be ok beacause the rotor is structurally oversized (if i return to the static stress analysis after the topo optimization the Safety Factor is bigger then 15). If you need more informations, please don't hesitate to ask.n

[Kalyani Deshmukh]

Hello,

I did a modal analysis of a damper-mass system. Then I did topology optimization for damper design for a natural frequency. I referred this video Topology Optimization of a Bell Crank Using ANSYS Mechanical - Part II - YouTube for tutorial but for natural frequency. I am having problems with the reverse engineering because the two dampers are acting as a body and I can't select a face in the new modal analysis. I am guessing I did something wrong with the optimization region.

 

This is the topology solution I am getting:

 

The mass has disappered. I did add a new body in the spaceclaim of the reverse engineering modal analysis. But I'm facing a few problems:

1. I can't split the geometry with damper members and body separately. The materials for both of them are different so they have to be separate.
2. I can't mesh the damper elements.
3. When I apply fixed support to the top face of the dampers, the body gets selected (because of problem 1). 

I am expecting a result like this - 

 

But I am getting a problem with meshing. Can you please also provide a link to a good in depth meshing course? Thanks!