Institute of Vibration, Shock and Noise, State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China.
J Acoust Soc Am. 2018 May;143(5):2768. doi: 10.1121/1.5026240.
Nowadays, the steady-state responses of human ear to pure tone stimuli have been widely studied. However, the temporal responses to transient stimuli have not been investigated systematically to date. In this study, a comprehensive finite element (FE) model of the human ear is used to investigate the transient characteristics of the human ear in response to impulsive stimuli. There are two types of idealized impulses applied in the FE analysis: the square wave impulse (a single positive pressure waveform) and the A-duration wave impulse (both of positive and negative pressure waveforms). The time-domain responses such as the displacements of the tympanic membrane (TM), the stapes footplate (SF), the basilar membrane (BM), the TM stress distribution, and the cochlea input pressure are derived. The results demonstrate that the TM motion has the characteristic of spatial differences, and the umbo displacement is smaller than other locations. The cochlea input pressure response is synchronized with the SF acceleration response while the SF displacement response appears with some time delay. The BM displacement envelope is relatively higher in the middle cochlea and every portion of BM vibrates at its best frequency approximately. The present results provide a good understanding of the transient response of the human ear.
如今，人们已经广泛研究了人耳对纯音刺激的稳态响应。然而，迄今为止，尚未系统地研究人耳对瞬态刺激的时间响应。在这项研究中，使用了一个全面的人耳有限元（FE）模型来研究人耳对脉冲刺激的瞬态特性。FE 分析中应用了两种理想化的脉冲：方波脉冲（单个正压波形）和 A 持续时间波脉冲（正压和负压波形）。得出了一些时域响应，例如鼓膜（TM）、镫骨底板（SF）、基底膜（BM）的位移、TM 应力分布和耳蜗输入压力。结果表明，TM 运动具有空间差异的特征，而鼓脐位移小于其他位置。耳蜗输入压力响应与 SF 加速度响应同步，而 SF 位移响应则有一定的延迟。BM 位移包络在中耳蜗较高，BM 的每一部分大约都以其最佳频率振动。目前的结果有助于更好地理解人耳的瞬态响应。
