Design and test of piezoelectric actuator for eardrum excitation
In this article,in order to address the limited high-frequency gain of traditional hearing aids and the invasive surgery required for middle ear implants,efforts are made to design,manufacture and test a piezoelectric actuator that directly drives the ear-drum.This actuator serves as an innovative auditory prosthesis,combining the placement of a completely-in-the-ear hearing aid with the acoustic quality of middle ear implants.The actuator's front end directly stimulates the eardrum to compensate for the patient's hearing loss.Firstly,to address the insufficient output displacement in the piezoelectric stack,efforts are made to introduce a compound two-stage displacement amplifier and optimize its displacement amplification,with the help of the multi-objective genetic algorithm.Subse-quently,in order to enhance the actuator's frequency characteristics,efforts are made to set up a mechanical model of actuator-human ear coupling.Besides,optimal structural parameters for the actuator are determined through the finite-element analysis.Finally,the ac-tuator prototype is manufactured and tested,so as to evaluate its hearing compensation performance.The results indicate that this actua-tor boasts a wide operating frequency range(0.1～10 kHz),low harmonic distortion(THD≤0.12％),non-invasive surgical require-ments,and superior high-frequency performance.Therefore,this actuator is suitable to compensate hearing loss caused by eardrum ex-citation,providing a new solution for clinical treatment of sensorineural hearing impairment.
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