基于平面声源实施结构声辐射有源控制的理论研究  

Theoretical study on active control of sound radiation based on planar sound sources

作　　者：陈克安[1] G.H.柯谱曼 

机构地区：[1]西北工业大学环境工程研究所,西安710072 [2]宾夕法尼压州立大学声学与振动中心,美国pa16802

出　　处：《声学学报》2003年第4期289-293,共5页Acta Acustica

基　　金：国家自然科学基金(69802010)

摘　　要：研究了利用分布式平面声源对结构声辐射进行有源控制的问题。首先建立了系统的数学模型,然后推导了有源控制条件下次级声源的强度和声功率降低的计算公式。在实际应用中,次级声源参数(面积大小、安放位置、个数等)对控制效果有重要影响,本文基于有源控制的物理机理和数值仿真研究这些问题。结果表明:一般情况下,次级声源板的振动模态分布与初级结构振动模态分布不相同,因此,在低频范围内,需要至少4个分布式次级声源,方能有效地控制初级结构声辐射。Active control of low frequency sound radiation using planar secondary sources is theoretically investigated. The primary sound field originates from a vibrating panel and the planar secondary sources are modeled as simply supported rectangular panels in an infinite baffle. The sound power of the primary and secondary panels is calculated, and then a series of formulae are derived to obtain the optimum reduction in sound power. Finally, active reduction for a number of secondary panel arrangements is examined, it is concluded that when the modal distribution of the secondary panel does coincide with that of the primary panel, one secondary panel is sufficient. Otherwise four secondary panels can guarantee considerable reduction in sound power over entire frequency range of interest.

关 键 词：平面声源 结构声辐射 有源控制 次级声源 强度 声功率 物理机理 振动模态分布 数值仿真 

分 类 号：TB535[理学—物理] O422.6[理学—声学]