Prediction of the characteristics of two types of pressure waves in the cochlea: Theoretical considerations
Prediction of the characteristics of two types of pressure waves in the cochlea: Theoretical considerations
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DOI：
10.1121/1.1763599
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发表时间：
2004-07-01
影响因子：
2.4
通讯作者：
Wada, H
中科院分区：
文献类型：
--
作者：
Andoh, M;Wada, H
这项研究的目的是预测两种类型的耳蜗压力波，即所谓的快波和慢波的特征。建立了Corti器官(OC)的二维有限元模型，考虑了流体-结构与周围淋巴液的相互作用。通过对沙土鼠半壳体其他部位的形态测量，确定了底部转角的OC的几何形状。就OC内材料的机械性能而言，采用了先前确定的OC内各部分的机械性能，并根据公布的静态刚度测量确定了未知的机械特性。流体-结构方案的时间推进是通过交错方法实现的。利用该模型，预测了快波和慢波的大小和相位，以便将数值计算得到的鼓阶内的压力分布与已知的鼓室内压力测量结果相吻合。将预测的压力波应用于模型时，基底膜速度的数值计算结果与前人实验测得的基底膜速度值吻合较好。因此，预测的压力波似乎是可靠的。此外，还发现流固耦合对OC在特征频率附近的动力学行为有很大影响。(C)2004年美国声学学会。
The aim of this study was to predict the characteristics of two types of cochlear pressure waves, so-called fast and slow waves. A two-dimensional finite-element model of the organ of Corti (OC), including fluid-structure interaction with the surrounding lymph fluid, was constructed. The geometry of the OC at the basal turn was determined from morphological measurements of others in the gerbil hemicochlea. As far as mechanical properties of the materials within the OC are concerned, previously determined mechanical properties of portions within the OC were adopted, and unknown mechanical features were determined from the published measurements of static stiffness. Time advance of the fluid-structure scheme was achieved by a staggered approach. Using the model, the magnitude and phase of the fast and slow waves were predicted so as to fit the numerically obtained pressure distribution in the scala tympani with what is known about intracochlear pressure measurement. When the predicted pressure waves were applied to the model, the numerical result of the velocity of the basilar membrane showed good agreement with the experimentally obtained velocity of the basilar membrane documented by others. Thus, the predicted pressure waves appeared to be reliable. Moreover, it was found that the fluid-structure interaction considerably influences the dynamic behavior of the OC at frequencies near the characteristic frequency. (C) 2004 Acoustical Society of America.