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Coupling Problems with Multibody Dynamics and Solid Mechanics.

Posted 05.11.2019, 03:29 GMT-5 Piezoelectric Devices, Structural & Acoustics 4 Replies

Hyunseok Lee
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I put a piezoelectric device in a rotating object, and I want to see the voltage change due to the deformation of the object.

I was thinking of coupling the Multibody Dynamics (MBD) and Piezoelectric device (PZD) modules.

So what I tried was to specify the piezoelectric element as Linear Elastic Material (Anisotropic) in Multibody Dynamics,

I tried to calculate the voltage generated by transferring the variables for the stresses generated during rotation(MBD) to the Solid Mechanics(PZD) module.

The domain for the piezoelectric element is then assigned to the MBD and PZD modules at the same time. This resulted in a “multiple moving frame specifications on the same selection” error during computation.

Is there a way to solve this problem?

Thanks

4 Replies Last Post 05.02.2020, 04:33 GMT-5
Pawan Soami COMSOL Employee

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Posted: 5 years ago 06.11.2019, 00:16 GMT-5
Updated: 5 years ago 06.11.2019, 00:17 GMT-5

Dear Hyunseok,

Each object/domain should be defined only in one physics, either in Multibody Dynamics or Solid Mechanics. In this case, the rotating object can be defined in the Multibody Dynamics interface and piezoelectric device can be defined in the Solid Mechanics interface.

Use Attachment node (in both physics) and Joint node (in MBD) to connect these two objects exist in two different physics.

Best regards,
Pawan Soami

Dear Hyunseok, Each object/domain should be defined only in one physics, either in Multibody Dynamics or Solid Mechanics. In this case, the rotating object can be defined in the Multibody Dynamics interface and piezoelectric device can be defined in the Solid Mechanics interface. Use Attachment node (in both physics) and Joint node (in MBD) to connect these two objects exist in two different physics. Best regards, Pawan Soami
Hyunseok Lee
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Posted: 5 years ago 04.02.2020, 08:46 GMT-5

thank you for the reply.

This helped me to use both PZD and MBD at the same time.

But there was another problem.

I wanted to measure the current generated as my modeling rotates.

So I added an electrical circuit module under the same conditions and computed my modeling.

But this time it doesn't compute,

Only external I-terminal and resistor (10000000 ohm) were applied.

I don't understand why it doesn't work.

Is there a way to solve this problem?

Thanks

thank you for the reply. This helped me to use both PZD and MBD at the same time. But there was another problem. I wanted to measure the current generated as my modeling rotates. So I added an electrical circuit module under the same conditions and computed my modeling. But this time it doesn't compute, Only external I-terminal and resistor (10000000 ohm) were applied. I don't understand why it doesn't work. Is there a way to solve this problem? Thanks
Pawan Soami COMSOL Employee

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Posted: 5 years ago 05.02.2020, 01:12 GMT-5

Dear Hyunseok,

Could you please share the exact error message what you are getting while adding Electrical Circuit interface in the model?

Best regards,
Pawan Soami

Dear Hyunseok, Could you please share the exact error message what you are getting while adding Electrical Circuit interface in the model? Best regards, Pawan Soami
Hyunseok Lee
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Posted: 5 years ago 05.02.2020, 04:33 GMT-5
Updated: 5 years ago 05.02.2020, 04:43 GMT-5

The error message is' Internal xmesh error. Failed to find model. '

When using adaptive mesh refinement, a 'maximum iteration reached' error occurs.

Alternatively, the convergence graph diverges and vibrates, and does not progress.

The error message is' Internal xmesh error. Failed to find model. ' When using adaptive mesh refinement, a 'maximum iteration reached' error occurs. Alternatively, the convergence graph diverges and vibrates, and does not progress.

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