Experimental measurement and analysis on dynamic response of cochlear basilar membrane in guinea pig

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (4) : 160-164.

TA Na1, ZHANG Jing1, XU Lifu1, ZHOU Lei2, HUANG Xinsheng2, RAO Zhushi1

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Abstract

To explore the dynamic characteristics of basilar membrane, the dynamic responses to pure tone in the basilar membrane (BM) of guinea pig were measured by using Laser Doppler Vibrometer (LDV).14 fresh specimens of guinea pig cochlea in vitro were used to test the velocity response and the displacement response of BM under pure tone excitation of 70dB, 80dB, and 90dB SPL.And the vibration characteristics of BM was analyzed by changing the frequency of the input sound signal.The experimental results show that the vibration of BM under pure tone excitation is sinusoidal vibration. The vibration velocity and displacement of BM at the same location varies from the frequency of input sound signal and the BM has the frequency selective characteristics and the maximum vibration response appears at the best frequency.The phase responses of BM under different sound pressures excitation have the similar trend and phase-delay increases rapidly above the best frequency. The sound transmission in the BM has the characteristic of travelling wave. The experimental methods and results guided studying the auditory mechanism of human ear.

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guinea pig / cochlear / basilar membrane / experimental measurement / dynamic response

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TA Na1, ZHANG Jing1, XU Lifu1, ZHOU Lei2, HUANG Xinsheng2, RAO Zhushi1. Experimental measurement and analysis on dynamic response of cochlear basilar membrane in guinea pig[J]. Journal of Vibration and Shock, 2018, 37(4): 160-164

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