Hadi,

Piezoelectric *generators*?

As in, using mechanical work to generate electrical power by the piezoelectric effect?

Mmm.

For large scale power generation I am sure you appreciate that the piezo effect for most (all?) known materials is too small to develop meaningful power - terribly small currents are achievable,

What is your intended field for such generators?

If you are looking at somewhat smaller-scale (parasitic generation from mechanical vibration) or perhaps even inter-corporeal for powering medical devices, then there are groups on those areas.

thank u Mr.Garry for reply

my purpose is starting with small-scale and extension it to large-scale

yes your right i want to use mechanical work to generate electrical power

i havent enough knowledge about feasibility of this project

if u help me i will be thankful

Hadi,

There are many papers in the public domain about this form of energy scavenging.

From human-carried (worn!) devices:

http://murj.mit.edu/reports/33

to industrial systems:

http://www.asme.org/kb/news---articles/articles/applied-mechanics/mems-vibrational-micro-power-generation

A good review of the basic technology types can be found here in the thesis by Gurkan Erdogan at the U of Minnesota:

http://www.menet.umn.edu/~gurkan/Energy%20Harvesting%20for%20MEMS.pdf

In general, a system that can alter its resonant frequency (self-tuning) will be more adaptive and efficient than one which has a broad bandwidth but a low Q. I'm guessing that you're looking at SHOs with some kind of energy pick-up (perhaps by a coil and magnet arrangement).

https://www.americanpiezo.com/piezo-theory/generators.html