基于声源叠加原理的大型号角扬声器声辐射特性分析  

Numerical Analysis of Sound Emission Characteristics of Large Horn-Loaded Loudspeaker Based on Source Superposition Model

作　　者：曾向阳[1] 薛旭瑞 王海涛[1] 

机构地区：[1]西北工业大学航海学院,陕西西安710072 [2]中航商用发动机有限责任公司,上海200241

出　　处：《西北工业大学学报》2013年第6期853-857,共5页Journal of Northwestern Polytechnical University

基　　金：航空科学基金(20121553017)资助

摘　　要：针对大型号角扬声器,文中采用一种新的数值方法即声源叠加法进行建模计算和分析,该方法将声场的解表示为一系列满足控制偏微分方程的基函数(偶极子或单极子)加权叠加的形式,具有算法简单、精度高的优点。对1个简化号角扬声器,分别利用声源叠加模型、解析法、边界元法计算并进行对比分析,验证了该方法的正确性和优势。最后利用它分析了2种常用的号角扬声器,即指数形号角扬声器和圆锥形号角扬声器的声辐射特性,得到了一些有价值的规律,对于扬声器设计具有很好的参考价值。The horn-loaded loudspeaker has advantages of strong direction performance , high output power ,high efficiency and so on .Hence , there is significant value in analyzing the acoustic radiation characteristics of the horn -loaded loudspeaker for the design of high intensity noise weapons and sound amplifying equpments .The analytical method in this paper is the numerical method .At present , the BEM （ boundrary element method ） is the main choice for the sound field analysis .However , it is only available for low and medium frequencies .Considering this , we use a new numerical method called source superposition technique to analyse the acoustic characterasitcs of the horn-louded loudspeaker .Its basic idea is to assume a solution as a series summation of basis functions satisfying the governing partial differential equation everywhere in domain .Firstly, to evaluate this technique effectively , a rigor-ous comparison with both known analytical solution and BEM method is done .And provened results show that it has simpler algorithm and higher speed .Then , we analysed the acoustic characterastics of two typical shapes of horn-loaded loudspeakers ,exponential and conical horns;this comparison leads to some useful conclusions that are of val-uable significance to the design of the horn-loaded speaker .

关 键 词：号角扬声器 声辐射 声源叠加法 边界元法 声压级 指向性 

分 类 号：O422[理学—声学]