on-chip piezoelectric

Hi, im doing a project on piezoelectric disks where I want to harvest energy from them. I have ordered some and waiting on them, I wonder if someone is familiar with working with these and could answer some questions. thanks in advance

Hi, is there anyone who can help me/guide me to solve the problem? Even if you could recommend me any teacher, senior, book, or paper, it would be of great help to me. I have come up with a dummy solution, but I am pretty sure it's not that accurate (I can show you my answer). I really...