脉冲噪声内耳传导路径的仿真与实验验证

X. Gary Tan, YungChia Chen, Thomas O'Shaughnessy
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引用次数: 0

摘要

最近来自重型武器训练和突破演习环境的数据表明,仅保护耳道可能不足以防止爆炸引起的脉冲噪声对战士的有害影响。本研究旨在阐明脉冲噪声进入内耳的替代途径,包括通过头部软组织和骨传导,深入了解爆炸致聋的基本机制,并通过实验验证计算模型。我们已经将仪器化的头部模型暴露于通过激波管(声压级>140分贝),以确定骨传导在内耳压力积聚中的作用。同时,我们开发了头部的有限元(FE)模型来模拟耳朵对脉冲噪声的生物力学响应。该模型用于描述耳内生物力学效应的加载条件来源于假想的武器射击事件。我们还开发了一个内耳模型来分析基底膜在受到脉冲噪声事件刺激的颅骨振动时的动态行为。通过模拟基底膜的运动,我们试图建立脉冲噪声与内耳可能的听觉破坏结果之间的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simulation and Experimental Validation of Alternate Pathways of Impulse Noise Conduction Into the Inner Ear
Abstract Recent data from heavy weapons training and breaching exercise environments suggest that protection of the ear canal alone may not be sufficient to prevent detrimental effects of blast-induced impulse noise on the Warfighter. This work is to elucidate alternate pathways of impulse noise penetration into the inner ear, including through the soft tissues of the head and bone conduction, gain insight into the fundamental mechanism(s) of blast induced hearing loss and validate the computational model with experiment. We have exposed the instrumented head model to impulse noise events generated via a shock tube (sound pressure level > 140 dB) to identify the role of bone conduction in pressure build up in the inner ear. Concurrently, we have developed a finite element (FE) model of the head to simulate the biomechanical response of the ear to impulse noise. The loading condition applied to the model to characterize the biomechanical effects in the ear is derived from notional weapons firing incidents. We have also developed an inner ear model to analyze the dynamic behavior of the basilar membrane when subjected to skull vibration stimulated by an impulse noise event. Using the simulated motion of the basilar membrane, we attempted to establish the relationship between the impulse noise and possible auditory disruption outcomes to the inner ear.
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