有限非均匀空腔障板对换能器指向性的影响  

Influences of finite-sized non-uniform air-backed baffle on transducer directivity

作　　者：尹义龙[1,2] 李俊宝[1] 夏金东[1] 邢建新[1] 吕可佳[1,2] 

机构地区：[1]中国科学院声学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《应用声学》2011年第2期124-130,共7页Journal of Applied Acoustics

摘　　要：声障板可以改善换能器的灵敏度和指向性,是换能器及基阵设计中必不可少的声学结构。本文建立了有限空腔障板和非均匀空腔障板的模型。利用射线声学的理论,研究了以上两种障板对换能器指向性的影响,结果表明障板的边缘和障板的厚度变化都会影响换能器的指向性。文章最后给出了部分实验结果,理论结果与实验结果基本相符。Sound baffle which improves the sensitivity and the directivity of a transducer is a useful structure for the transducer design.In the paper,models of the finite air-backed baffle and the non-uniform air-backed baffle are presented.Based on ray theory,the influence of the two kinds of air-backed baffles on the directivity of the transducer is studied.Results show that the edge of the baffle and the changes of the baffle＇s thickness affect the directivity of the transducer.The comparisons between the theoretical and the experimental results are given.

关 键 词：有限空腔障板 换能器 指向性 射线声学 

分 类 号：TN643[电子电信—电路与系统]