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청각기관 고막을 생체 모방한 다이어프램의 쌍선형 강성 특성
마이 반 응옥(Mai Van Ngoc),정광용(Gwang-Yong Jung),김기우(Gi-Woo Kim) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.3
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.
반공진을 이용한 대역 차단형 비틀림 진동 절연기의 토크 전달률 해석 및 측정
마이 반 응옥(Mai Van Ngoc),윤종환(Jong-Hwan Yun),김기우(Gi-Woo Kim) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.5
This study presents the investigation of new type of torsional vibration isolator utilizing an anti-resonance induced by planetary gear sets. This type of torsional isolator generates the anti-resonance frequency capable of effectively attenuating torsional vibration induced by an internal combustion engine those in a specific range. To evaluate its feasibility and isolation performance, the torque transmissibility of both the proposed torsional vibration isolator and the conventional torsional vibration isolator are estimated, and compared. The band-stop frequency can be tuned to achieve wider isolation frequency range. Finally, the proposed torsional vibration isolator was designed, manufactured, and its torque transmissibility, one of the essential vibration isolation performance indicators, was experimentally measured by using a low inertia dynamometer with non-contact torque sensors and then compared with the simulation results of the proposed torsional vibration isolator.