This computational study aims to identify vocal tract adjustments that minimize the peak vocal fold contact pressure during phonation and thus should be targeted in voice therapy treating phonotraumatic vocal hyperfunction. The results showed that for a given subglottal pressure, the effect of vocal tract adjustments on the peak vocal fold contact pressure was generally small except when such adjustments caused noticeable changes in the glottal flow amplitude. In this study, this occurred mainly when the lip opening was reduced and at conditions of large initial glottal angles or high subglottal pressures, which decreased the peak contact pressure but also significantly reduced the output sound pressure level (SPL). On the other hand, increasing lip opening significantly increased sound radiation efficiency from the mouth and reduced the subglottal pressure required to produce a target SPL. Because of the large effect of the subglottal pressure on the peak contact pressure, increasing lip opening thus was able to significantly reduce the peak contact pressure in voice tasks targeting a specific SPL. In contrast, the effect of pharyngeal expansion alone had only a small effect on the peak contact pressure, whether controlling for the subglottal pressure or targeting a specific SPL.

中文翻译：

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发声过程中的声带调整以最大程度地减少声带接触压力

这项计算研究旨在确定在发声期间最大限度地减少峰值声带接触压力的声道调整，因此应该针对治疗声外伤性声带功能亢进的语音治疗。结果表明，对于给定的声门下压力，声道调整对峰值声带接触压力的影响通常很小，除非这种调整导致声门流量幅度的显着变化。在这项研究中，这主要发生在嘴唇张开减少以及初始声门角度较大或声门下压力较高的情况下，这降低了峰值接触压力，但也显着降低了输出声压级 (SPL)。另一方面，增加嘴唇张开显着提高了口腔的声音辐射效率，并降低了产生目标 SPL 所需的声门下压力。由于声门下压力对峰值接触压力的影响很大，因此增加嘴唇张开能够显着降低针对特定 SPL 的语音任务中的峰值接触压力。相比之下，无论是控制声门下压力还是针对特定的 SPL，仅咽扩张的影响对峰值接触压力的影响很小。