analyzing piezoelectric energy harvester

  • Last Post 26 April 2019
  • Topic Is Solved
nilszbh posted this 25 April 2019

Hi everyone. 


So I am trying to model a piezoelectric energy harvester using piezo and meme Ansys extension, I have the correct material properties, and boundary conditions from the APDL code of the same project, but somehow my model does not work and I get really weird results (totally different from the APDL code output).

My questions are:

1- how to correctly introduce the resistor to the model? in fact, I cannot introduce a circuit element to my model. immediate error. my resistor in 75Kohm.

2- solved

3- I get totally unrealistic voltage results in my output (either in the order of 1e-9 or 1e+8), in an input frequency of 10 Hz. I think it is because of the wrong boundary conditions. Could you please help me with interpreting the boundary condition apdl code that I have attached? for this output (screenshot) I have put 170pa pressure on the free end.


4- how do you get power-frequency output? as there is no such response defined, it should be the user-defined result, right?


I have attached screenshots related to the question. Your advice and guides are very much appreciated!

Attached Files

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jj77 posted this 25 April 2019

The displacements in modal analysis are not physically meaningful (not actual displacement), and are just due to the eigen-vectors being scaled/normalised, so they do not mean anything.


One gets real meaningful displacements when conducting a harmonic, random or say transient analysis - but as we said modal analysis just gives some displacements magnitudes that are just scaled, and do not physically mean any.

nilszbh posted this 26 April 2019

Thanks very much for your reply.


Indeed the displacements in the modal analysis are not meaningful. However, as I have other problems in my simulation (asked in the rest of the questions), I thought maybe they are somehow connected to the weird "displacement results" of modal analysis.