Optimal Design of Variable Stiffness Supported Round-Window Stimulating Piezoelectric Actuator
Aiming at the problems of mismatch between circular window and circular window membrane and the inability to monitor the initial pressure,a piezoelectric actuator with variable stiffness support is designed based on the anatomical structure of human ear.Firstly,the coupling model between the actuator and the human ear is established.Then,based on the model,the key parameters of the actuator displacement amplifier,support spring and piezoelectric stack are optimized and analyzed.Finally,the output performance of the actuator is tested by experiment.The experimental results show that the designed piezoelectric actuator can monitor the initial pressure.The resonant frequency is up to 5 160 Hz,and the high frequency characteristics are superior.The actuator meets the needs of round window stimulation,and can improve hearing loss compensation in sensorineural patients.
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