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Optistruct topology optimization result does not make sense

User: "Sixuan Chen"
Altair Community Member
Updated by Sixuan Chen

Dear all,

 

I'm working on a project as the attached image shown: We want to increase the natural frequency of the blue plate by design reinforcing components attach to the plate.

Therefore we set up a design space (green block). The objective is max mode 1 frequency of the whole model, and constraint is max 0.5 volume fraction of the design space.

 

However as the second image shown:

1. Mostly only the element on the edge of the design space are left, and it's easy to understand they WON'T help to increase the plate natural frequency at all;

2. The mid elements circled in black are 'floating', meaning they are not attached to the plate at all.

 

Could anyone help to figure out what I may do wrong in the setup?

Thank you,

Peter

 

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