摘要
全息测量系统设计的关键是测量全息面测点复声压(幅值和相位)的真实数据,介绍了自行设计的近场声全息(NAH)测量的传声器线阵扫描系统。利用边界元法计算了传声器线阵架结构表面声散射对阵上传声器测量全息复声压的影响,提出了敷设吸声材料以提高测量精度的措施;对在线阵架表面敷设吸声材料后的声散射效应仿真结果表明,吸声材料能够有效降低声散射效应,可以提高测量精度。
The most important consideration in the design of the NAH measurement equipment is to ensure getting the accurate data of complex acoustic pressure（amplitude and phase） values in acoustic field.A scanning device of linear microphone array,which can measure the complex acoustic pressure distribution near by the noise source for NAH measurement,is recommend in this paper.The influence of acoustic scattering from the frame of microphone array on the acoustic pressure measurement is calculated,and a measure that applies damping materials to improving the accu-racy of experimental measurement is put forward.The simulation results demonstrate that the sound absorbing mate-rial laying on the surfaces of the frame is effective to improving the accuracy of measurement.
出处
《声学技术》
CSCD
2011年第3期211-215,共5页
Technical Acoustics
关键词
近场声全息
传声器线阵
边界元法
声散射
吸声材料
NAH（Near-field Acoustic Holography）
microphone array
BEM（Boundary Element Method）
acoustical scattering
damping material
