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Eigenfrequency of Piezoelectric shunts

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Hi, everyone
Recently, I try to utilize the coupling modules (Piezoelectric Device+ Electrical Circuit ) to evaluate the eigenfrequency of piezoelectric shunting system. However, I come across some difficulties. I find the Electrical Module doesn't support eigenfrequency calculation (it only supports stationary, frequency domain and time dependent). Are there anyone can help me solve this problem? The sketch map of the piezoelectric shunting system is attached.
Thank you.

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