Characterization of Synthetic, Self-Oscillating Vocal Fold Models
Characterization of Synthetic, Self-Oscillating Vocal Fold Models
复制标题
合成自振荡声带模型的表征
DOI：
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
James S. Drechsel
中科院分区：
文献类型：
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作者：
James S. Drechsel
人工合成、自振荡声带模型的表征机械工程系理科硕士詹姆斯·S·德雷切尔声带对于语音产生是必不可少的，更好地了解声带振动特性可能有助于改进嗓音障碍的治疗。然而，研究真实的声带褶皱是一个巨大的挑战。体内研究受到获取和安全问题的限制。切除的喉的使用寿命很短(大约几分钟)，而且很难参数化。相比之下，合成声带模型具有较长的使用寿命，并且可以很容易地进行参数化。在这篇论文中，我们讨论了最近发展起来的人类声带的合成自振模型进行的一系列测试。这些测试包括振动频率、声门下压力和时间平均流速的测量。对单层和双层综合模型的差异进行了评价。将合成模型与实际声带行为进行了比较。合成模型的振动频率、压力和流速与人的发声一致。研究了声门下管长度对模型振动频率的影响。运动是通过高速成像观察到的。用粒子图像测速技术(PIV)测量了不同声道不对称情况下理想声道的声门射流速度，包括假折叠的影响。用PIV测量的声门喷射速度与切除喉部测量的速度一致。在所有测试案例中都观察到了起始涡流。假褶皱的存在抑制了起始涡旋的两侧，并在某些情况下创造了从假褶皱中脱落的新的涡旋结构。建立了一种算法来计算和可视化喷气核心中心线。在声道病例中，声门喷口倾向于偏向最近的壁面；在假折叠病例中，相反的趋势观察到，声门喷口偏离最近的壁面(朝向中面)。均方根速度图显示出明显的切变层和喷流核区。声道压力远大于发声起始压力的病例，与开放喷口和假折叠病例相比，RMS速度显着增加。
CHARACTERIZATION OF SYNTHETIC, SELF-OSCILLATING VOCAL FOLD MODELS James S. Drechsel Department of Mechanical Engineering Master of Science The vocal folds are essential for speech production, and a better understanding of vocal fold vibration characteristics may help improve treatments of voice disorders. However, studying real vocal folds presents significant challenges. In-vivo studies are limited by access and safety issues. Excised larynges have a short useable lifetime (on the order of minutes) and are difficult to parameterize. In contrast, synthetic vocal fold models have long useable lifetimes and can be easily parameterized. In this thesis, a series of tests performed on recently developed synthetic, self-oscillating models of the human vocal folds are discussed. These tests include measurements of vibration frequency, sub-glottal pressure, and time-averaged flow rate. The differences between one-layer and two-layer synthetic models are evaluated. Comparisons are made between synthetic model and real vocal fold behavior. The synthetic model is shown to have vibrated at frequencies, pressures, and flow rates consistent with human phonation. The influence of sub-glottal tube length on model vibration frequency is examined. Motion is observed using high-speed imaging. Velocity measurements of the glottal jet using particle image velocitmetry (PIV) were performed with and without an idealized vocal tract, including the effects of the false folds, for various cases of vocal tract asymmetry. Glottal jet velocities measured using PIV were consistent with velocities measured using excised larynges. A starting vortex was observed in all test cases. The presence of the false folds acted to restrain the sides of the starting vortex, and in some cases created new vortical structures shed from the false folds. An algorithm was created to calculate and visualize the jet core centerline. In the vocal tract cases, the glottal jet tended to skew toward the nearest wall; in the false fold cases, the opposite trend was observed as the jet skewed away from the nearest wall (towards the midplane). Plots of RMS velocity showed distinct regions of shear layer and jet core. Vocal tract cases at pressures much greater than phonation onset pressure showed significant increases in RMS velocities compared to open jet and false fold cases.
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影响因子：
2.4
作者：
Shinwari, D;Scherer, RC;Afjeh, AA
通讯作者：
Afjeh, AA
影响因子：
2.4
作者：
Scherer, RC;Shinwari, D;Afjeh, AA
通讯作者：
Afjeh, AA
影响因子：
2.4
作者：
Erath, Byron D.;Plesniak, Michael W.
通讯作者：
Plesniak, Michael W.
DOI：
10.1016/s0892-1997(03)00012-2
发表时间：
2003-06
期刊：
Journal of voice : official journal of the Voice Foundation
影响因子：
--
作者：
M. Agarwal;R. Scherer;H. Hollien
通讯作者：
M. Agarwal;R. Scherer;H. Hollien