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目的探讨常压和高压环境下噪声对耳蜗的影响,用数值模拟方法弥补试验手段不足导致的噪声对耳蜗听力行为特征研究的缺失。方法基于健康人耳蜗CT扫描图像,结合自编程序,利用PATRAN软件建立三维螺旋耳蜗有限元模型。应用NASTRAN软件进行流固耦合频率响应分析和瞬态响应分析,通过数值模拟方法模拟常压和高压环境中噪声对耳蜗的影响。结果模型计算结果与文献中已报道的试验结果相吻合,验证了模型的正确性。当频率小于5 kHz时,常压和高压环境中噪声激励下基底膜位移基本一致;当频率大于5 kHz时,常压环境中噪声激励下基底膜位移逐渐减小,而高压环境中噪声激励下基底膜位移却持续增加。结论高压环境中噪声对基底膜高频影响更加明显。数值模拟结果弥补了试验手段不足导致的噪声对人耳蜗听力行为特征研究的缺失,为今后对耳蜗进行针对性试验研究提供了新的思路和理论支撑。
Objective To investigate the effect of noise on cochlear under atmospheric and high pressure conditions and to make up for the lack of study on the hearing characteristics of cochlear due to the lack of experimental means by numerical simulation. Methods Based on CT images of the cochlea of healthy individuals, a three-dimensional spiral cochlear finite element model was established by using PATRAN software. NASTRAN software was used to analyze the frequency response and transient response of fluid-structure interaction. The numerical simulation method was used to simulate the effect of noise on the cochlea in both atmospheric and high pressure environments. Results The calculated results of the model are in good agreement with those reported in the literature. The correctness of the model is verified. When the frequency is less than 5 kHz, the basement membrane displacement is basically the same under the noise excitation in atmospheric and high pressure environments. When the frequency is greater than 5 kHz, the basement membrane displacement decreases under the noise excitation in atmospheric environment, while under high pressure Basement membrane displacement continued to increase. Conclusion High-pressure noise in the environment of the basement membrane more obvious impact. The numerical simulation results can make up for the lack of study on the auditory and behavioral characteristics of the human cochlea caused by the noise caused by the lack of experimental means, which provides a new idea and theoretical support for the targeted experimental study of the cochlea in the future.