[Gucki]

Hi Gerard,

I simply connected the piezo ceramic to a measuring device:

   

and placed my heavy vacuum pump in the case on a turntable in front of it:

   

The following frequency is measured:

   

The case is then rotated by 90°:

   

And the frequency changes significantly:


   

Of course, this still needs to be checked for faults. It is conceivable that the piezo reacts to the changed stray capacitance.

The piezo may have to be placed in a shielded housing. And then series of measurements must be made. 

But in principle, that's actually the way I have in mind. So - if everything works out - I can finally tell you the oscillation frequencies of the piezo as a function of the angle of rotation of a heavy mass.

Would that be enough for you?

Best regards

Wolfgang