摘要
刚性表面球形传声器阵列是测量三维声场常用的前端,由于刚性球面对入射波声场有散射影响,直接测量值不是原入射波声场的声压值,因而不能使用在自由声场条件下建立的声场模型和近场声全息方法来重构入射波声场。通过刚性球体表面声波散射的数学模型,建立起入射波声压与发生散射后总声压之间的关系,进而通过刚性表面球形传声器阵列测量声压,计算入射波声场分布,并进行声源识别定位。通过仿真与实验,检验了球面入射波遇到刚性表面球体发生散射后,球体表面处声压分布的变化。由球面近场声全息方法,重构球形阵列表面及外部空间的入射波声场,检验了波数、重构距离参数变化对声场重构精度的影响。结果表明:采用刚性表面球形传声器阵列测得的声场总声压,运用根据声波散射模型建立的球面近场声全息方法,可以以一定的精度重构出入射波声场的三维空间分布。
Rigid spherical microphone array is an ideal measurement front-end for three-dimensional sound field re-construction. However,as the rigid surface of the array scatters incident sound waves,the directly measured pres-sures and near-field acoustic holography approach based on the math model of free field could not be employed toreconstruct the incident sound field. In this paper,the math model of scattered sound field based on Neumannboundary condition was applied;the relationship between the total sound pressure after scattering and the incidentsound pressure was developed and analyzed. Then the incident sound field was reconstructed by using the input da-ta of measured total sound pressure with a rigid microphone array. The variation of sound pressure distribution onthe surface of rigid sphere was examined through simulations and experiments. And the reconstruction accuracy wasexamined when the reconstruction parameters,such as frequency and reconstruction radius,varied. The reconstruc-tion results show that the incident sound field can be reconstructed with certain accuracy with a rigid spherical mi-crophone array,based on spherical near-field acoustic holography with the math model of scattered sound field.
出处
《传感技术学报》
CAS
CSCD
北大核心
2015年第10期1459-1466,共8页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(51205354
51275469)
浙江省国际科技合作专项项目(2013C14014)
关键词
球形传声器阵列
入射波声场重构
球面近场声全息
声波散射
刚性表面球体
spherical microphone array
reconstruction of incident sound field
spherical near-field acoustic holography
sound wave scattering
rigid surface sphere
