How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch?

Piezoelectric coupling between the rectangular substrate and rectangular piezoelectric patch is simple. Because the beam and patch are correctly meshed for the same size to coincide the nodes in all directions.

But in the case of tapered beam (non-uniform cross-section), the elements will be irregular after meshing, very difficult to coincide the nodes correctly. So piezoelectric coupling not able to correctly to get voltage output from that.

Suggest your views for this problem.

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