椭圆模型模拟声带振动的远场指向性  

Research on far-field directivity of the elliptic model simulating vocal cord vibration

作　　者：曹辉[1] 魏静[1] 赵海君[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院/陕西省超声重点实验室,陕西西安710119

出　　处：《西北大学学报（自然科学版）》2015年第2期223-228,共6页Journal of Northwest University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(11374199)

摘　　要：针对声带振动产生的声场的空间分布问题,根据声带的生理结构、振动特性及声学基本理论知识,提出用椭圆振动模型来模拟声带的振动,采用点源组合的方法计算了正常声带模型振动时产生的远声场的指向性。运用Matlab对声带模型的声场指向性进行了模拟仿真与分析,讨论了声带振动频率对声带模型产生的指向性的影响以及振动的点源数对声压幅值的影响;并模拟出当声带发生病变时,会影响声带模型的声压幅值,进一步又探讨了声带模型空隙尺寸发生变化时声场指向性的变化规律。结果表明,与正常声带模型相比,病变声带模型已不再有原来的规律,从而为声带的进一步研究及临床治疗提供了理论基础。Aiming at the problem of the space sound field distribution generated by the vocal cord vibration, elliptic model simulating vocal cord vibration is put forward according to the physiological structure and vibration characteristics of the vocal cord and the basic theory of acoustic knowledge, the combination of point source is used to calculate far sound field directivity generated by the normal vocal cord vibration, simulating and analyzing sound field directivity of vocal fold model by using Matlab and discussing the impact of frequen- cy on directivity and the impact of point source numbers on sound pressure amplitude of the vocal cord model; and it is simulated that the vocal cord lesions affects sound pressure amplitude of the vocal cord model, further more the vocal cord gap size impacting on sound field directivity is discussed. The results show that the lesion model no longer has primary rules than the model of normal vocal cord, which provides a theoretical basis for further study and clinical treatment of vocal cord.

关 键 词：声带 远声场指向性 声压幅值 

分 类 号：R767.92[医药卫生—耳鼻咽喉科]