CAJ | 학술논문

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.
강성표면구형전성기진렬시측량삼유성장상용적전단,유우강성구면대입사파성장유산사영향,직접측량치불시원입사파성장적성압치,인이불능사용재자유성장조건하건립적성장모형화근장성전식방법래중구입사파성장.통과강성구체표면성파산사적수학모형,건립기입사파성압여발생산사후총성압지간적관계,진이통과강성표면구형전성기진렬측량성압,계산입사파성장분포,병진행성원식별정위.통과방진여실험,검험료구면입사파우도강성표면구체발생산사후,구체표면처성압분포적변화.유구면근장성전식방법,중구구형진렬표면급외부공간적입사파성장,검험료파수、중구거리삼수변화대성장중구정도적영향.결과표명:채용강성표면구형전성기진렬측득적성장총성압,운용근거성파산사모형건립적구면근장성전식방법,가이이일정적정도중구출입사파성장적삼유공간분포.
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 to reconstruct the incident sound field. In this paper,the math model of scattered sound field based on Neumann boundary condition was applied;the relationship between the total sound pressure after scattering and the incident sound 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 on the surface of rigid sphere was examined through simulations and experiments. And the reconstruction accuracy was examined 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.