Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Design, modelling and analysis of a novel implantable bone conduction hearing aid with a piezoelectric actuator
Download
PhD_Thesis_Anıl_Koyuncu_Final.pdf
Date
2022-9-01
Author
Koyuncu, Anıl
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
458
views
414
downloads
Cite This
This thesis study proposes a novel bone conduction (BC) transducer design, which intends to overcome the drawbacks of conventional bone conduction hearing aids (BCHAs). A piezoelectric actuator design with a rhombus-type mechanical amplifier is chosen as a BC transducer in the first step, and a commercial amplified piezoelectric actuator (APA) is selected for trials. The dynamics of the mechanical amplifier and embedded stacked piezoelectric actuator are formulated separately based on linear analytical approaches. The output displacement of the coupled system is then calculated using linear vibration analysis under low harmonic voltage inputs. Based on the linear analytical model, a new APA is designed as a BC transducer with an attached tip mass, and the new APA prototype is manufactured. Constant-voltage amplitude stepped-sine tests indicate strong softening nonlinearity with the jump phenomenon observed in the frequency response at high voltage levels. Therefore, an accurate dynamical model of an APA is obtained by using a recently developed nonlinear system identification method, namely Response-Controlled stepped-sine Testing (RCT). Then the describing function of the predicted nonlinearity is identified by using describing surface method (DSM), and a nonlinear multi-degree of freedom (MDOF) model is obtained by substructure coupling of the APA and the attached tip mass. Based on the simulation results of the nonlinear MDOF BCHA model, the tip mass of the BCHA prototype is adjusted. The transmitted force-frequency response tests are performed with the optimized BCHA prototype attached to Brüel and Kjær (B&K) type 4930 artificial mastoid in order to validate the nonlinear MDOF BCHA model and compare the performance of the proposed BC transducer design with a conventional electromagnetic bone vibrator (Radioear B71). Finally, hearing threshold tests are performed on normal hearing participants and hearing-impaired patients with the BCHA prototype and the B71 bone vibrator. It is observed that the difference in the threshold level spectrum between the BCHA prototype and the B71 bone vibrator is consistent with the difference in the transmitted force level spectrum obtained from the artificial mastoid tests Consequently, in the thesis study, a novel BCHA transducer is proposed based on a miniature stacked piezoelectric actuator used as a BC transducer for the first time. The sophisticated dynamics of the proposed BCHA transducer are modeled by employing linear modeling and nonlinear identification. By virtue of recently proposed nonlinear dynamic modeling techniques, valuable contributions have been made to the limited body of knowledge on the nonlinear dynamics of APAs. It is demonstrated that the nonlinear dynamics of the BCHA can be captured accurately by the proposed methodology, which can be presented as an exceptional method in the pre-clinical performance evaluation of BC hearing implants.
Subject Keywords
Bone Conduction Transducer
,
Amplified Piezoelectric Transducer
,
Nonlinear Identification
,
Response Controlled Stepped-sine Testing
,
Describing Surface Method
,
Describing Function Method
,
Nonlinear Structural Coupling
URI
https://hdl.handle.net/11511/99468
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Thin Film PZT Acoustic Sensor for Fully Implantable Cochlear Implants
İlik, Bedirhan; Koyuncuoğlu, Aziz; Uluşan, Hasan; Chamanıan, Salar; Işık Akçakaya, Dilek; Şardan Sukas, Özlem; Külah, Haluk (2017-09-06)
This paper presents design and fabrication of a MEMS-based thin film piezoelectric transducer to be placed on an eardrum for fully-implantable cochlear implant (FICI) applications. Resonating at a specific frequency within the hearing band, the transducer senses eardrum vibration and generates the required voltage output for the stimulating circuitry. Moreover, high sensitivity of the sensor, 391.9 mV/Pa @900 Hz, decreases the required power for neural stimulation. The transducer provides highest voltage ou...
Fully Implantable Cochlear Implant Interface Electronics With 51.2-mu W Front-End Circuit
Ulusan, Hasan; Chamanian, Salar; Ilik, Bedirhan; Muhtaroglu, Ali; Külah, Haluk (2019-07-01)
This paper presents an ultralow power interface circuit for a fully implantable cochlear implant (FICI) system that stimulates the auditory nerves inside cochlea. The input sound is detected with a multifrequency piezoelectric (PZT) sensor array, is signal-processed through a front-end circuit module, and is delivered to the nerves through current stimulation in proportion to the sound level. The front-end unit reduces the power dissipation by combining amplification and compression of the sensor output thr...
Measurement of ground borne vibrations for foundation design and vibration isolation of a high-precision instrument
ÜLGEN, DENİZ; ERTUĞRUL, ÖZGÜR LÜTFİ; Özkan, M. Yener (2016-11-01)
This study focuses on the foundation design and vibration isolation of a high-precision instrument subjected to ground-borne vibrations. The allowable vibration level for the proper operation of the sensitive equipment was 50 mu g in a frequency range of 1-300 Hz. Prior to foundation design, first, an extensive field survey including geological and geophysical tests were performed in situ to obtain the static and dynamic physical properties of the soils. Next, vibration levels at various locations in the vi...
Development of a Three-Tier Test to Assess Misconceptions About Simple Electric Circuits
Pesman, Haki; Eryılmaz, Ali (Informa UK Limited, 2010-01-01)
The authors aimed to propose a valid and reliable diagnostic instrument by developing a three-tier test on simple electric circuits. Based on findings from the interviews, open-ended questions, and the related literature, the test was developed and administered to 124 high school students. In addition to some qualitative techniques for establishing the validity, some quantitative techniques were also used. Consequently, Cronbach's alpha reliability coefficient was estimated for the test as .69, and results ...
MEMS thin film piezoelectric acoustic transducer for cochlear implant applications
İlik, Bedirhan; Külah, Haluk; Department of Electrical and Electronics Engineering (2018)
In this thesis, a multi-frequency thin film piezoelectric acoustic sensor concept to be placed on the eardrum has been proposed for the development of next generation and fully implantable cochlear implants (FICIs). The design consists of several thin film piezoelectric cantilever beams, each of which resonates at a specific frequency within the daily acoustic band. The device will exploit the functional parts of the natural hearing mechanism and mimic the function of the hair cells in the cochlea, where th...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
A. Koyuncu, “Design, modelling and analysis of a novel implantable bone conduction hearing aid with a piezoelectric actuator,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.