Study on Speech Production with Normal or Diseased Vocal Folds from the Mechanical Viewpoint.

在人类发声过程中，来自肺部的气流和声带的振动在声门处耦合，产生自激振荡，产生声源。声源在上呼吸道被放大，从口腔和鼻孔发出“声音”。因此，发声是由机械机制控制的。因此，名古屋大学（NU）和藤田保健大学（FU）的研究人员对声带息肉、癌、神经麻痹等引起的正常声音和病变声音进行了研究，旨在建立这些疾病的诊断方法。名古屋大学（NU）的研究：对以往基于正常对称声带的发声模型进行了改进，将声带的硬度、质量和张力分布的影响纳入模型中。将改进后的模型与FU测得的正常嗓音进行比较。此外，他们以前的分析模型对不对称的患病声带进行了修改，使其更容易与患者的数据进行比较，测量在FU.Research在藤田保健大学（FU）：为了检查振动力学的正常和患病声带，下和上声门压力和流量进行了测量，而声带的运动图片拍摄使用喉频闪镜。特别是针对声门上下压的微小振动模式，研究了正常声带和神经麻痹声带的力学特性，在现有研究的基础上，计划进一步开展研究。

In human voice production, air flow from the lung and vibration of vocal folds are coupled at glottis to generate self-excited oscillation which produces sound sources. The sound sources are amplified at upper airway to produce "voice" from the mouth and nostril. The voice production is, therefore, controlled by mechanical mechanism. Hence, normal voice and diseased ones generated by the vocal folds with polyp, cancer, or nerve paralysis were studied jointly by researchers at Nagoya University (NU) and Fujita Health University (FU), aiming at establishing a diagnostic method of the diseases.Research at Nagoya University (NU) :Their previous model of voice production based on normal symmetric vocal folds was improved so that effects of distribution of stiffness, mass, and tension of the vocal folds were included in the model. The improved model was compared with normal voices measured at FU. Furthermore, their previous analytical model on un-symmetric diseased vocal folds was modified to make it easier to compare with data of patients measured at FU.Research at Fujita Health University (FU) :To examine vibration mechanics of normal and diseased vocal folds, sub-and super-glottal pressures and flow rate were measured while motion pictures of the vocal folds were taken using a laryngeal stroboscope. Especially, focusing on small vibration patterns of the sub-and super-glottal pressures, mechanical features of normal and nerve paralyzed vocal folds were studied.Based on the present joint research, further study will be planned.