청각기관 고막을 생체 모방한 다이어프램의 쌍선형 강성 특성

초록

This study presents the preliminary study for a new shaped diaphragm structure aimed at mimicking the function of the tympanic membrane (TM) of human auditory systems. The TM consists of three parts: malleus, pars tensa, and pars flaccida, and the dynamic behavior of the TM is typically known to be different from other common thin membranes. In other words, the shape of human TM is elliptic and conical, and the TM does not move as a normal flat and thin diaphragm. We investigated the bilinear nonlinear stiffness of elliptic and conical shaped diaphragm similar to actual TM of human auditory system to deliver improved vibrating characteristics. The diaphragm structure made by 3-D printing technology can exhibits the bilinear nonlinearity when the sound pressure level (SPL) of incoming sound is high, resulting in the flat and broad frequency response.

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