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Numerical investigation of the earplug contribution to the low-frequency objective occlusion effect induced by bone-conducted stimulation
The Journal of the Acoustical Society of America ( IF 2.4 ) Pub Date : 2021-09-17 , DOI: 10.1121/10.0006209
Kévin Carillo 1 , Olivier Doutres 1 , Franck Sgard 2
Affiliation  

The use of earplugs is commonly associated with an increased perception of the bone-conducted part of one's own physiological noise. This phenomenon is referred to as occlusion effect and is most prominent at low frequencies. Several factors influence the occlusion effect, such as the ear anatomy; the bone-conducted stimulation; and the type of occlusion device and its fit, insertion depth, and material properties. The latter factor is of great interest to potentially reduce the occlusion effect of passive earplugs. This paper investigates the mechanism(s) of contribution of earplugs to the objective occlusion effect. A two-dimensional axi-symmetric finite element model of the outer ear is used and investigated in an electro-acoustic framework. Simulation results are shown to compare reasonably well with measurement data, which qualifies the model to study the influence of earplugs on the occlusion effect. Two mechanisms are highlighted: (i) a Poisson effect induced by the normal component of the earcanal wall vibration and (ii) a longitudinal motion caused by the tangential component of the earcanal wall vibration. By varying the geometry of the surrounding tissues, the spatial distribution of the earcanal wall vibration is shown to influence the contribution of the earplug to the occlusion effect.

中文翻译:

耳塞对骨传导刺激低频客观闭塞效应贡献的数值研究

耳塞的使用通常与对自身生理噪声的骨传导部分的感知增加有关。这种现象被称为闭塞效应,在低频时最为突出。影响咬合效果的因素有很多,例如耳朵的解剖结构;骨传导刺激;封堵器的类型及其配合、插入深度和材料特性。后一个因素对于潜在地降低无源耳塞的闭塞效应具有重要意义。本文研究了耳塞对客观遮挡效果的贡献机制。在电声框架中使用并研究了外耳的二维轴对称有限元模型。模拟结果显示与测量数据相当好比较,这使模型有资格研究耳塞对咬合效果的影响。强调了两种机制:(i)由耳道壁振动的法向分量引起的泊松效应和(ii)由耳道壁振动的切向分量引起的纵向运动。通过改变周围组织的几何形状,耳道壁振动的空间分布显示出影响耳塞对闭塞效果的贡献。
更新日期:2021-09-17
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