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Peculiarities of oscillations of human trachea walls

机译：气管壁振荡的特殊性

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The analysis of peculiarities of trachea wall structure is conducted. Possible mechanisms of its excitation are discussed. The acoustical and mathematical models of trachea with elastic walls are developed. These models foresee the possibilities of kinematic excitation of the upper end of trachea and propagation of an elastic wave along the trachea wall. In the wide frequency range a quantitative analysis of modulus and phase of the oscillatory velocity of the trachea elastic wall is performed. These data are compared with those obtained for the acoustical model of trachea with locally responding walls. It is shown that the elastic wall behaves as a delay line, and an elastic wave can propagate along this line in the range of low frequencies (f < 500 Hz), having the speed about 10 ÷ 20 m/sec. At higher frequencies the elastic wall behaves like a locally responding surface. It is shown that even relatively low levels of kinematic excitation of the upper end of trachea cause significant changes in the character of frequency dependence of the trachea wall oscillatory velocity. The analysis of the frequency dependencies of oscillatory velocities of the first seven annular cartilages of the trachea wall is performed. It is found that their levels diminish with the increase of the distance of cartilage from the upper end of trachea. The relatively simple technique allowing to estimate real values of the transmission function of the oscillatory velocity from vocal chords to the upper end of trachea is proposed.
机译：进行气管壁结构特点的分析。讨论了其激发的可能机理。建立了具有弹性壁的气管的声学和数学模型。这些模型预示了气管上端运动激励和沿气管壁弹性波传播的可能性。在较宽的频率范围内，对气管弹性壁的振荡速度的模量和相位进行了定量分析。将这些数据与从具有局部响应壁的气管声学模型获得的数据进行比较。结果表明，弹性壁起着延迟线的作用，并且弹性波可以沿着该线在低频范围内（f <500 Hz）传播，速度约为10÷20 m / sec。在较高的频率下，弹性壁的行为类似于局部响应表面。结果表明，即使是相对较低水平的气管上端运动激励也会引起气管壁振荡速度的频率依赖性特性发生重大变化。进行了气管壁的前七个环形软骨的振荡速度的频率依赖性的分析。发现它们的水平随着从气管上端到软骨的距离增加而降低。提出了一种相对简单的技术，该技术允许估计从声带到气管上端的振荡速度的传递函数的实际值。

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