Hi Daniel,
Thank you for you kind help!
After investigations done so far, I recognized that Trans126 element might
not be a good choice to be used in my tilting mirror applications. Though
the Ansys help manual indicated something as below:
[image: Inline image 1]
As you can see, the above figure is using Trans126 elements, though I think
it is a simplified model. I heard that Trans126 is good for attraction,
while difficult to perform the leaving electrodes. Beyond that. I think my
micromirror has more complicated geometry than the parallel plates, I don't
know this parallel-plate simplification would be a good choice for it.
As for now, I am considering to proceed with the Solid226 option, which is
exactly what you have suggested. I am trying to mesh the air gap between
the movable mirror and the fixed electrodes using Solid226 elements, while
leaving the other parts using Solid45. The electroelastic and structural
elements are joined through nodal connectivity at the interface between
them. I am still working on this direction right now, when the geometry
becomes more complicated, seems it get more difficult to converge, I have
many small parts to trim, such as the meshing and boundary conditions...
Another option seems to be multi-field solver, which up-to-now I have not
acquired too much reference materials and did not dive in too deep yet.
Again, thank you very much for your help and suggestions! I am really
grateful to you. If you could provide more insight, that would be really
great.
On Fri, Nov 1, 2013 at 11:22 AM, Daniel Shaw wrote:
> Hi Youmin:
>
>
>
> To perform an electrostatic-structural simulation using Mechanical APDL
> (aka “classic ANSYS”), you can use either the 22x coupled-field elements,
> the multi-field solver (MFS), or the electro-mechanical transducer element
> (TRANS126). You could also use the reduced order electrostatic-structural
> element (ROM144). The 22x elements and the MFS use a sequential coupling
> approach. TRANS126 and ROM144 use a matrix coupling approach.
>
>
>
> If possible, I recommend using TRANS126. It is the simplest and most
> robust approach. With the 22x elements and the MFS, you might have meshing
> issues at pull-down. ROM144 can be complicated to implement. If fringing
> effects are significant, TRANS126 might be difficult to accurately
> implement. In that case, you need to use one of the other methods.
>
>
>
> Regards,
>
>
>
> Daniel Shaw
>
> ANSYS, Inc.
>
>
>
> On Wed, Oct 30, 2013 at 9:50 PM, Youmin Wang >wrote:
>
> > Dear Friends,
> >
> > I am starting to use Ansys for the modeling of MEMS micromirror
> > static/dynamic analysis. There have been many previous work in this
> field,
> > but according to my observations, 3 key technologies were basically used
> > for MEMS electromechanical coupling, which are 1. using Coupled Field
> > Element (SOLID226); 2. Multi-field solver; and 3. Trans126.
> >
> > Seems for method #1 I have to use air to enclose the whole device if
> fringe
> > electric field needs to be considered, but in "Gyimesi, Miklos, Ilya
> > Avdeev, and Dale Ostergaard. "Finite-element simulation of
> > micro-electromechanical systems (MEMS) by strongly coupled
> > electromechanical transducers." Magnetics, IEEE Transactions on 40.2
> > (2004): 557-560." it says in large deformation bending electrode problem,
> > Trans126 might not be suitable.
> >
> > Do you guys have any previous experience on this selection issue?
> Besides,
> > seems Trans126 also requires the pre-stress definition, which I am still
> > struggling to find out where to apply...
> > _______________________________________________
> > Hosted by the MEMS and Nanotechnology Exchange, the country's leading
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> > Visit us at http://www.mems-exchange.org
> >
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> >
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> >
> _______________________________________________
> Hosted by the MEMS and Nanotechnology Exchange, the country's leading
> provider of MEMS and Nanotechnology design and fabrication services.
> Visit us at http://www.mems-exchange.org
>
> Want to advertise to this community? See http://www.memsnet.org
>
> To unsubscribe:
> http://mail.mems-exchange.org/mailman/listinfo/mems-talk
>
PNG
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