Active control of acoustic reflection, absorption, and transmission using thin panel speakers.
Active control of acoustic reflection, absorption, and transmission using thin panel speakers.
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DOI：
10.1121/1.1534834
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发表时间：
2003-01
期刊：
影响因子：
--
通讯作者：
H. Zhu;Rajesh Rajamani;K. Stelson
中科院分区：
文献类型：
--
作者：
H. Zhu;Rajesh Rajamani;K. Stelson
本文探讨了薄板的发展，可以电子控制，以提供所需的反射系数的表面。这种面板既可以用作完美的反射器，也可以用作吸收器。它们也可以被设计成阻挡声音传播的传输屏障。控制系统的发展是基于使用分离入射声和反射声的波分离算法。为了获得理想的反射系数，反射声被控制到适当的水平。入射声被用作前馈控制的声学参考，并且具有与控制系统扬声器的作用隔离的重要特性。为了使用面板作为传输阻挡器，面板后面的声压被驱动到零。使用入射信号作为参考，在成功地减少声音的宽带传输中再次起着关键作用。面板本身是由海报板和小型稀土致动器构成的。详细的实验结果表明，该算法在实现反射或传输的实时控制方面是有效的。这些面板能够有效地阻挡宽带声音的传输。这些面板的实际应用包括噪音机械的外壳，吸声墙纸，隔音墙的发展，以及隔音玻璃窗的发展。
This paper explores the development of thin panels that can be controlled electronically so as to provide surfaces with desired reflection coefficients. Such panels can be used as either perfect reflectors or absorbers. They can also be designed to be transmission blockers that block the propagation of sound. The development of the control system is based on the use of wave separation algorithms that separate incident sound from reflected sound. In order to obtain a desired reflection coefficient, the reflected sound is controlled to appropriate levels. The incident sound is used as an acoustic reference for feedforward control and has the important property of being isolated from the action of the control system speaker. In order to use a panel as a transmission blocker, the acoustic pressure behind the panel is driven to zero. The use of the incident signal as a reference again plays a key role in successfully reducing broadband transmission of sound. The panels themselves are constructed using poster board and small rare-earth actuators. Detailed experimental results are presented showing the efficacy of the algorithms in achieving real-time control of reflection or transmission. The panels are able to effectively block transmission of broadband sound. Practical applications for these panels include enclosures for noisy machinery, noise-absorbing wallpaper, the development of sound walls, and the development of noise-blocking glass windows.