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Experimental Characterization of Piezoelectric and Elastic Operational Field-dependent Non-linearities of Multilayer Benders for Resonant Driving of Bone-conduction Hearing Aids via a Dual-actuators Side-by-side Device by Ayech Benjeddou; Dominic Joseph R. Enriquez; Johannes Schicker; Alfred Binder; Taulant Sinani is a Engineering article available to read on EtoBox.

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Abstract A soft piezoceramic multilayer (ML) bending thin and thick dual -actuators side-by-side device, for use in bone-conduction hearing aids (BCHA), was characterized experimentally . For this purpose, first, quasi-static (0.1 Hz square wave) transverse displacements (deflections) of each ML bender were measured using a laser vibrometer (LV) under unimorph and bimorph drivings at various non-amplified peak (p) voltages (1V p –13V p ). The resulting peak displacement–voltage curves were found clearly nonlinear , indicating a pronounced piezoelectric (PE) field-dependent nonlinearity (FDNL). Then, experimental electric impedance analyses were conducted for each ML bender, using an impedance analyzer, under 1V p unimorph driving for the whole audio frequency range (20 Hz–20 kHz). The identified three modes’ superposed impedance magnitudes and phases showed their increasing deviation to the frequency scale left with increasing the modes’ order, indicating a possible softening elastic FDNL, as confirmed later by harmonic frequency response LV measurements at 1V p . Finally, the harmonic frequency responses , for the above audio frequency range, were measured for each ML bender using

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Author

Ayech Benjeddou; Dominic Joseph R. Enriquez; Johannes Schicker; Alfred Binder; Taulant Sinani

Publisher

Informa UK Limited

Published

2023

Language

EN

Field

Engineering (Physical Sciences)