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提出一种非线性动力学建模仿真发声系统,分类息肉和麻痹喉声源的方法,为声带疾病分类时参数选择提供了依据。首先介绍息肉和麻痹声带力学模型,耦合声门气流产生喉声源,求取喉声源频率(基频)、基频微扰;提出用庞加莱截面,分岔图对模型振动进行非线性分析;改变声带病理参数及声门下压,分析频率参数和混沌参数李雅普诺夫指数的变化。仿真实验结果表明,声带麻痹减小了发声基频,且只在一定压力范围内出现混沌振荡;息肉声带的混沌则分布在整个压力范围内。根据最大李雅普诺夫指数随声门下压变化的差异性分布,有助于识别并分类声带息肉和声带麻痹。
A non-linear dynamic modeling and simulation system for vocalization was proposed to classify the polyps and paralysis of the throat sound source, which provided the basis for parameter selection in the classification of vocal cord diseases. Firstly, the vocal tract mechanics model of polyp and paralysis was introduced, and the gurgle sound source was generated by coupling the glottis airflow to get the frequency of the throat sound source (fundamental frequency) and the perturbation of the fundamental frequency. The Poincare section and bifurcation diagram were proposed to model the vibration of the model nonlinearly Analysis; Change the pathological parameters of vocal cord and glottic pressure, analysis of frequency parameters and chaotic parameters Lyapunov index changes. Simulation results show that vocal cord paralysis reduces the fundamental frequency of vocalization, and chaos oscillation occurs only within a certain pressure range. The chaos in polyp vocal cords is distributed over the entire pressure range. According to the maximal Lyapunov index, the variability of the subglottic pressure changes helps to identify and classify vocal cord polyps and vocal cord paralysis.