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worm-like movement

Posted 7 gen 2022, 10:12 GMT-5 Piezoelectric Devices, Structural Mechanics 3 Replies

Nasim Rezaei
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Hi,

I am modelling a Piezoelectric structure, that is supposed to move along a surface, as a result of the deformations caused by an input voltage. I have successfully simulated the displacement both in stationary phase and in time-domain, where a sinusoidal voltage is used as input. However, I don't know how to proceed with modelling the movement. I know that I should use contact pairs, but which types of settings should I use for such a movement?

3 Replies Last Post 17 gen 2022, 11:18 GMT-5
Edgar J. Kaiser Certified Consultant
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Posted: 3 years ago 8 gen 2022, 06:11 GMT-5

Hi,

contacts can be a little tricky and you will probably need to play with the settings. Check the application library, maybe you find some useful hints. You will probably need a moving mesh as well.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi, contacts can be a little tricky and you will probably need to play with the settings. Check the application library, maybe you find some useful hints. You will probably need a moving mesh as well. Cheers Edgar
Nasim Rezaei
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Posted: 3 years ago 13 gen 2022, 08:29 GMT-5

Thank you for the answer. I have been playing a lot with the settings. So, far, I can't find a way to have a converging model. But I will keep trying and also exploring the library.

Cheers Nasim

Thank you for the answer. I have been playing a lot with the settings. So, far, I can't find a way to have a converging model. But I will keep trying and also exploring the library. Cheers Nasim
Nasim Rezaei
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Posted: 3 years ago 17 gen 2022, 11:18 GMT-5

Hi, I have been playing with different settings of the contact and the solvers. But I can't seem to find a properly converging model. In my model (attached to this post), I have two different voltages applied to two conductive materials encapsulating a piezoelectric material. This is to enable a latera movement of the whole structure along the ground. There is an inverted silicon substrate in the model as well. I started with free contacts to simplify the model, and then continue with friction. For now, I want to see how a stationary solver converges, then I will move on to a time-dependent solver, in order to model a sinusoidal input voltage. If somebody could look at my model and tell me where I have made mistakes, I would really appreciate their help. At this point, I am very confused and the settings might look random. But the most recurring wanrning (which I guess causes a non-converging model) is "inverted mesh element" near coordinates at which there is no geometry. Changing the mesh did not help in this respect at all :(

kind regards Nasim

Hi, I have been playing with different settings of the contact and the solvers. But I can't seem to find a properly converging model. In my model (attached to this post), I have two different voltages applied to two conductive materials encapsulating a piezoelectric material. This is to enable a latera movement of the whole structure along the ground. There is an inverted silicon substrate in the model as well. I started with free contacts to simplify the model, and then continue with friction. For now, I want to see how a stationary solver converges, then I will move on to a time-dependent solver, in order to model a sinusoidal input voltage. If somebody could look at my model and tell me where I have made mistakes, I would really appreciate their help. At this point, I am very confused and the settings might look random. But the most recurring wanrning (which I guess causes a non-converging model) is "inverted mesh element" near coordinates at which there is no geometry. Changing the mesh did not help in this respect at all :( kind regards Nasim

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