On Thu, 13 Nov 2003, Jayaram wrote:

> Hi all,
>
> I am trying to optimize a cantilever structure using
> ANSYS 7.0 version. I am finding it difficult to choose
> a desired variable for both static analysis and modal
> anlysis.
>
> I have taken length, thickness as Design variable and
> Stress for state variable. For the objective variable
> i dont know which parameter to take. If i take volume,
> it is too negligible as i am simulating a
> microstructure. I also need to increase the cantilever
> sensitivity.
>

Jayaram,

It's easier to work with nondimensional variables, such as aspect ratio,
in such situations. I presume you are solving a 3-d problem in Ansys but
it might help to nondimensionalize the equivalent 1-d beam equation and
start from there.

If you are looking for an objective function, a standard nondimensional
quantity that measures the dynamic sensitivity (and resolution) of
oscillators is its quality factor (Q). Q is the ratio of maximum
mechanical energy to the energy dissipated in one cycle.

Hope this helps.

Dnyanesh