Patent ID: 8854923
Filing Date: 2014-10-07
Classification: B01B,H04R

Abstract:
1. A transducer assembly comprising: a support member; a first layer of piezoelectric material mechanically joined to said support member for providing strain in a first desired direction that affects said assembly, said first layer having first layer electrodes; a second layer of piezoelectric material mechanically joined to said support member for providing strain in a second desired direction that affects said assembly, said second layer having second layer electrodes; electrical drive circuitry joined to said first layer electrodes and said second layer electrodes, said electrical drive circuitry being configured to provide a driving voltage to one of said first layer electrodes and said second layer electrodes and being configured to provide the driving voltage with a stiffening voltage to the other of said first layer electrodes and second layer electrodes, wherein said electrical drive circuitry further comprises a controller configured to calculate and adjust the magnitude of said stiffening voltage based on a desired transducer assembly resonance frequency and environmental conditions.