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有源吸声层理论研究 被引量:4

Generalized Engineering Analysis of Active Surface of Sound Absorption
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摘要 提出一种可用于吸收低频斜入射声波的有源吸声结构。文中描述了吸声层的组成形式,然后建立理论模型,按近场方法推导了有源控制前后反射声功率的计算公式,而后按声反射功率最小化准则求得最优次级力源复强度。最后通过计算机仿真证明了该吸声层吸收低频声波的有效性,并研究了吸声效果与次级力源位置的关系。 In many applications, such as reduction of the reflected noise of highway traffic, active surface of sound absorption is highly useful. But research is still very limited, hampering its widespread use. In order to make theory more useful to engineers, we generalize it in two aspects: (1) the incident sound wave may be oblique, i.e., not limited to being normal to active surface; (2) our theory can be applied to different media (air, water, oil). Fig.1 shows a rectangular parallelepiped, where the top flexible plate is the active surface, and the other five rigid sides support the active surface and contain the medium. We excite the active surface with controllable secondary force sources. Eq.(7) gives the reflected acoustic power for the cavity structural coupling system. Minimizing eq.(7), I obtain the optimum reduction achievable with control. The calculated solid curve in Fig.3 shows the variation of reflected sound power with frequency before control and the calculated dotted curve, the variation after control. Fig.4 shows the calculated sound reductions for various locations of secondary exciting force source.
作者 陈克安
机构地区 西北工业大学
出处 《西北工业大学学报》 EI CAS CSCD 北大核心 1999年第2期181-186,共6页 Journal of Northwestern Polytechnical University
基金 "国家教委跨世纪优秀人才培养计划"基金 国家自然科学基金
关键词 有源声吸收 有源吸声层 反射声功率 声波 吸收 sound absorption, reflected sound power, active surface
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参考文献3

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  • 3陈克安,声学学报,19卷,6期,434页

同被引文献21

  • 1陈克安,马远良.封闭空间自适应有源噪声控制误差传声器的最优布放[J].声学学报,1993,18(5):357-366. 被引量:11
  • 2姜哲.基于声辐射模态讨论声能量辐射与传递[J].声学学报,2005,30(2):125-131. 被引量:11
  • 3仲维彬,陈克安,李宏伟.平板扬声器用于结构声有源噪声控制实验研究[J].应用声学,2006,25(4):246-251. 被引量:6
  • 4陈克安,陈国跃,李双,潘浩然.分布式位移传感下的有源声学结构误差传感策略[J].声学学报,2007,32(1):42-48. 被引量:10
  • 5Nelson P A,Elliott S J.Active Control of Sound[M].London:Academic Press,1992.
  • 6Wang B,Fuller C R,Dimitriadis E K.Active control of noise transmission through rectangular plates using multiple piezoelectric or point force actuators[J].Journal of Acoustics,1991,90(5):2 820-2 830.
  • 7Barrault G,Bermudez J C M,Lenzi A.New analytical model for the filtered-x least mean squares algorithm verified through active noise control experiment[J].Mechanical Systems and Signal Processing,2007,21(4):1 839-1 852.
  • 8Zhu H,Rajamani R,Stelson K A.Active control of acoustic reflection,absorption and transmission using thin panel speakers[J].Journal of the Acoustical Society of America,2003,113(2):852-870.
  • 9Chen K A,Koopmann G H.Active control of lowfrequency sound radiation from vibrating panel using planar sound sources[J].Journal of vibration and Acoustics,2002,124(1-2):2-9.
  • 10Chen K A,Chen G Y,Pan H R,et al.Secondary actuation and error sensing for active acoustic structure[J].Journal of Sound and Vibration,2008,309(1-2):40-51.

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