复杂结构体的声辐射模态远场计算方法  

Far Field Computation Approach of Acoustic Radiation Modes for Arbitrary Structures

作　　者：鱼海涛[1,2] 王英民[1] 王奇[1] 苟艳妮[1] 

机构地区：[1]西北工业大学航海学院,西安710072 [2]西安科技大学理学院,西安710054

出　　处：《噪声与振动控制》2014年第6期1-6,共6页Noise and Vibration Control

基　　金：国家自然科学基金项目(51309191);西安科技大学培育基金项目(201137)

摘　　要：声辐射模态在主动结构声控制领域取得了满意的噪声控制效果,但缺乏有效简便的远场测量或计算方法已成为其进一步发展的瓶颈。基于远场封闭包络与结构表面辐射声功率相等,借助声传递矩阵的概念,将声辐射模态的求解转换到流体域进行求解,获得了一种通用的任意结构远场声辐射模态求解方法。为了验证方法的可行性,利用不同的场点包络形状、不同距离的场点以及不同的场点数目对其性能进行分析,主要包括结构辐射声功率、声辐射模态幅值、声辐射模态效率。利用获得的声辐射模态计算脉动球的辐射声功率,并与其理论解进行比较,计算结果显示不同的场点状态对辐射声功率的影响较小,所获取的声辐射模态和辐射效率具有较高的可信度。同时,本方法可为远场测量声辐射模态提供理论参考。Acoustic radiation modes （ARM） have achieved satisfactory effects in adaptive noise control. However, lackof effective and convenient measurement or computation approach hinders them from their further development. Since theacoustic radiation power at the far field enclosed envelope is equal to that in structure surface, the solution of ARM can beconverted to the computation in fluid domain with the help of the concept of acoustic transfer matrix （ATM）. In this paper, ageneral far field computation approach for arbitrary structures is proposed. To validate the feasibility of this approach, theperformance of acoustic radiation power of structure, amplitudes of ARM and efficiency of ARM are analyzed with differentshapes of field point envelope, different radius field point envelopes and different numbers of field points. As an example,the acoustic radiation power of a pulsing sphere is calculated by using the ARM obtained at the far field, and is comparedwith the theoretical solution. The computation results show that the different field point conditions have only a little influenceon the computation of acoustic radiation power, and the obtained ARM and its efficiency have high credibility. The proposedapproach has provided a theoretical basis for measurement of ARM at the far field.

关 键 词：声学 声辐射模态 声传递矩阵 边界元方法 辐射功率 辐射效率 

分 类 号：TB535[理学—物理]