Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Simulation Study of Artificial Cochlea Based on Artificial Basilar Membrane for Improving the Performance of Frequency Separation

인공기저막 기반 인공와우의 주파수 분리 성능향상을 위한 인공기저막 전산모사

  • Kim, Tae-In (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Chang, Seong-Min (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.) ;
  • Song, Won-Joon (Dept. of Nature-Inspired Nano Convergence System, Nano Convergence and Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Bae, Sung-Jae (Dept. of Nature-Inspired Nano Convergence System, Nano Convergence and Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Kim, Wan-Doo (Dept. of Nature-Inspired Nano Convergence System, Nano Convergence and Manufacturing Systems Research Division, Korea Institute of Machinery & Materials) ;
  • Cho, Maeng-Hyo (School of Mechanical and Aerospace Engineering, Seoul Nat'l Univ.)
  • Received : 2012.01.05
  • Accepted : 2012.01.25
  • Published : 2012.04.01
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Abstract

The basilar membrane (BM), one of organs of cochlea, has the specific positions of the maximum amplitude at each of related frequencies. This phenomenon is due to the geometry of BM. In this study, as the part of the research for the development of fully implantable artificial cochlea which is based on polymer membrane, parametric studies are performed to suggest the desirable artificial basilar membrane model which can detect wider range of frequency separation. The vibro-acoustic characteristics of the artificial basilar membrane are predicted through finite element analysis using commercial software Abaqus. Simulation results are verified by comparing with experimental results. Various geometric shapes of the BM and residual stress effects on the BM are investigated through the parametric study to enable a wider detectable frequency separation range.

기저막은 달팽이관의 한 기관으로서 주파수 대역에 따라 기저막의 최대 진폭 발생 위치가 변화하여 소리를 인지할 수 있게 되며 이는 기저막의 형상에 기인한다. 본 연구에서는 인공기저막 기반의 완전 삽입형 인공와우 개발을 위한 연구의 일환으로써 주파수 분리 대역폭을 보다 확장시킬 수 있는 기저막의 형상을 제안하기 위해 설계 인자 연구를 수행하였다. 상용 유한요소소프트웨어 Abaqus 를 이용한 유한요소 해석을 통해 인공기저막의 음향 진동 특성을 예측하였으며 해석결과는 실험결과와 비교하여 검증하였다. 기저막 모델의 다양한 형상 변화와 기저막 모델에 존재하는 잔류응력에 따른 주파수 분리 대역의 변화 추이를 설계 인자 연구를 통하여 제시하였다.

Keywords

References

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