Institute of Sound and Vibration Research, University of Southampton, Highfield Campus, Southampton, SO17 1BJ United Kingdom.
J Acoust Soc Am. 2011 Sep;130(3):1441-51. doi: 10.1121/1.3607420.
A discrete model of cochlear mechanics is introduced that includes a full, three-dimensional, description of fluid coupling. This formulation allows the fluid coupling and basilar membrane dynamics to be analyzed separately and then coupled together with a simple piece of linear algebra. The fluid coupling is initially analyzed using a wavenumber formulation and is separated into one component due to one-dimensional fluid coupling and one comprising all the other contributions. Using the theory of acoustic waves in a duct, however, these two components of the pressure can also be associated with a far field, due to the plane wave, and a near field, due to the evanescent, higher order, modes. The near field components are then seen as one of a number of sources of additional longitudinal coupling in the cochlea. The effects of non-uniformity and asymmetry in the fluid chamber areas can also be taken into account, to predict both the pressure difference between the chambers and the mean pressure. This allows the calculation, for example, of the effect of a short cochlear implant on the coupled response of the cochlea.
引入了一个离散的耳蜗力学模型，其中包括对全三维流体耦合的完整描述。这种表述方式允许将流体耦合和基底膜动力学分别进行分析，然后通过简单的线性代数方法将它们耦合在一起。首先使用波数公式对流体耦合进行分析，并将其分为由于一维流体耦合而产生的一个分量和包含所有其他贡献的一个分量。然而，根据管道中声波的理论，由于平面波，这两个压力分量也可以与远场相关联，并且由于消逝的、更高阶的模式，也可以与近场相关联。然后，可以将近场分量视为耳蜗中额外纵向耦合的多个源之一。还可以考虑流体腔区域的非均匀性和不对称性的影响，以预测腔室之间的压力差和平均压力。例如，这允许计算短的耳蜗植入物对耳蜗耦合响应的影响。
