有源吸声结构近场声学特性  

Near-Field Acoustic Performance of Active Sound Absorption Structures

作　　者：郝夏影[1] 陈克安[1] 陆晶[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《噪声与振动控制》2010年第5期64-68,73,共6页Noise and Vibration Control

基　　金：陕西省科学基金(2005E229)资助项目

摘　　要：有源吸声结构是近年来提出的一种利用有源控制技术吸收低频反射声的智能结构,对其近场声学性能的分析将为系统优化设计、次级源和误差传感器布放及控制目标选取等关键问题提供理论支持。本文在最小反射声功率条件下,对控制前后吸声结构近场观察面声强及吸声系数的变化进行数值仿真。仿真结果从近场法向声强的幅值、辐射形式及空间分布等方面分析有源吸声结构的近场声学特性,并从结构表面吸声系数变化的角度进一步加以验证。The active sound absorption structure proposed in recent years is a kind of smart structure applied to actively absorb low-frequency reflected sound.Analyzing the near-field acoustic performance of the structure can offer a theoretical help for some key issues,such as design optimization,the arrangements of secondary sources and error sensors,and the selection of the control objectives.Under the condition of minimum reflection sound power,the changes of sound intensity and absorption coefficient in the near-field of the structure before and after controlling are investigated by numerical simulations.The near-field acoustic performance of active sound absorption structure is analyzed in the aspect of the amplitude,radiation form and spatial distribution of the normal sound intensity.The performance is verified further by analyzing the changes of absorption coefficient on the surface of the active sound absorption structure.

关 键 词：声学 有源吸声结构 近场声强 吸声系数 

分 类 号：O422.4[理学—声学]