Problem with Optimization

Luca Campello

Good morning

My name is Luca.

I have a question in optimization: why model consist on a cantilever beam clamped at base motion, I would like to optimise the shape of my beam in a such way the second natural frequency and the third natural frequency occur at the same frequency or at least to minimise the distance between them.

How could I reach this aim, what I need to put as objective, response and constraints?

Is it possible in opimization to demand a shape in order to get a specific state of stress in addition?

Thank you in advance

Adriano_Koga

you could create:

 

DRESP1 response for freq2

DRESP1 response for freq3

DEQTION with an equation, such as F(f2,f3)=f3-f2

DRESP2(function) assigning the above equation, and freq2 and freq3 as arguments to the equation.

This will create a derived response, which points to the difference of freq3 and freq2.

With this, you could define it as objective, for example, minimize the Diff