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Add Damping and Loss
In the physics toolbar you can add attributes to the Piezoelectric Material node, especially the following damping and loss contributions:
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Mechanical Damping: Specify the domains of application, then choose if you want to define a loss factor for cE, a loss factor for sE (in Strain-charge form), an isotropic loss factor, or a Rayleigh damping.
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Dielectric Loss: Specify the domains of application, then choose if you want to define a loss factor for εrS, a loss factor for εrT (in Strain-charge form), or dispersion.
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Coupling Loss: Specify the domains of application, then choose if you want to define a loss factor for e, a loss factor for d (in Strain-charge form), or Rayleigh damping.
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Conduction Loss (Time-Harmonic): Specify the domains of application, then choose how you want to define the Electrical conductivity.