Simulation based estimation of dynamic mechanical properties for viscoelastic materials used for vocal fold models
Simulation based estimation of dynamic mechanical properties for viscoelastic materials used for vocal fold models
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DOI：
10.1016/j.jsv.2011.05.008
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发表时间：
2011-08-01
影响因子：
4.7
通讯作者：
Doellinger, Michael
中科院分区：
文献类型：
--
作者：
Rupitsch, Stefan J.;Ilg, Juergen;Doellinger, Michael
为了更深入地了解人类发声过程和产生声音的机制，我们建立了包含人工声带的真实设置。通常，这些声带由粘弹性材料（如聚氨酯混合物）组成。可靠的基于模拟的装置研究要求所使用的粘弹性材料的力学性能。这项工作的目的是确定这些材料的机械材料参数（杨氏模量，泊松比和损耗因子）。因此，我们提出了一种低成本的测量装置，即所谓的振动传输分析仪（VTA），它可以分析粘弹性材料在传播机械波时的传递行为。利用数学反求方法，方便地调整了材料参数，使模拟结果与传递行为的测量结果相吻合。与其他工作相反，我们确定了黏弹性材料在人类语音频率范围内（100-250 Hz）的机械性能的频率相关函数。三种不同材料的结果清楚地表明，泊松比接近0.5，杨氏模量随频率的增加而增加。当频率为400 Hz时，所研究粘弹性材料的杨氏模量比静态情况（0 Hz）高约80%。我们通过制作声带模型的实验验证了确定的力学特性。因此，在测量和模拟之间只会发生很小的偏差。(C) 2011 Elsevier Ltd.版权所有。
In order to obtain a deeper understanding of the human phonation process and the mechanisms generating sound, realistic setups are built up containing artificial vocal folds. Usually, these vocal folds consist of viscoelastic materials (e.g., polyurethane mixtures). Reliable simulation based studies on the setups require the mechanical properties of the utilized viscoelastic materials. The aim of this work is the identification of mechanical material parameters (Young's modulus, Poisson's ratio, and loss factor) for those materials. Therefore, we suggest a low-cost measurement setup, the so-called vibration transmission analyzer (VTA) enabling to analyze the transfer behavior of viscoelastic materials for propagating mechanical waves. With the aid of a mathematical Inverse Method, the material parameters are adjusted in a convenient way so that the simulation results coincide with the measurement results for the transfer behavior. Contrary to other works, we determine frequency dependent functions for the mechanical properties characterizing the viscoelastic material in the frequency range of human speech (100-250 Hz). The results for three different materials clearly show that the Poisson's ratio is close to 0.5 and that the Young's modulus increases with higher frequencies. For a frequency of 400 Hz, the Young's modulus of the investigated viscoelastic materials is approximately 80% higher than for the static case (0 Hz). We verify the identified mechanical properties with experiments on fabricated vocal fold models. Thereby, only small deviations between measurements and simulations occur. (C) 2011 Elsevier Ltd. All rights reserved.