Piezo electric

Maybe get hold of an old fuel injector and a piezo gas lighter and experiment with these. One is driven electrically the other, mechanically.

I'm a bit confused about the vibration thing... I've used piezo discs at resonance to produce ultrasonic power to nebulise liquid.

Are you talking about driving the piezo mechanically or electrically? (Or am I just being dense?)

well actually my final project is about hang gliding

how to control the hang gliding is very easy

just move your body left or right, mm the point is just move

your center of mass of your body,

and to do with piezo electric i must manipulate the piezo with electric

in this case i use stack type piezo.. still long way to go..

PLEASE VISIT http://en.wikipedia.org/wiki/Piezoelectricity .Confusions will end!

Visit a website for any one of the vast number of accelerometer manufacturers. PCB Piezotronics, Wilcoxin, Bruel and Kjaer, CTC, Etc.

Wikipedia may (or may not) steer you in the right direction, but I would not rely on it, and many professors detest it. (I am studying for a masters degree and all my profs have made it very clear that wikipedia is not an acceptable source.)

Hi MegAnthos

I asked a similar question a short while ago and had a very good response from 'Butcher' if you look in that discussion forum you will also get his opinion.

I hope it helps as it is quite a complex area.

KennyT

hi kennyT

excuse me but what your topic that relate with piezo??

i can't found in mechanical engineering forum discussion

thanks

Hi MegAnthos

I have a design that relies on 'peizo electricity' in both directions. Ocillation= electricity, and electricity= ocillation. I asked a similar question for the actual calculations that are required and the best crystal formation. "Butcher" pointed out where to go for the answers. The answers are there but you do have to know what you actually want before you can dig in the right direction.

The forum was headed "Piezoelectricity Calculations" so look in the general forum list and you will see the threads so far.

Good luck,

KennyT

CONTACT KISTLER INSTR. CORP FOR INFO ON THERE PRODUCTS. THEY ARE LOCATED IN AMHERST,NEW YORK JUST OUTSIDE OF BUFFALO,NY IN THERE LIT. IT WILL GIVE YOU ALL YOUR ANSWERS. I WORKED THERE FOR 5 YEARS.

Piezo devices convert electrical energy into mecanical force and visa-versa. They are anisotropic solids and have different properties in different directions. If you do a Google search under "piezoelectric properties" you will find definitions of each constant. Too much to explain here. The second order you refer to is related to the fact that when a solid vibrates, there are fundamental resonant frequencies as well as higher order vibration modes or overtones. These are defined in any text on vibration. Simple shapes like bars, rods, disks, and plates can be analyzed by simple closed form equations. The Sonalert is an example of a simple piezo bimorph disc that when driven by an oscillator, vibrates at its fundamental resonant frequency(about 2200 hz). Bimorphs are a method of generating amplified motion required to achieve good coupling to air. The motion of a standard piezo shape is too small to move enough air to be heard by the ear. Complex shapes are analyzed with the aid of a computer or by experiment.