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通过取消窗口腔内外周边的源集群来通过声学全场窗口进行主动降噪的可行性研究

P Y Chan¹, S K Tang², Chi-Chung Cheung³

¹Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China.

The Journal of the Acoustical Society of America

|October 4, 2024

概括

积极的噪音控制有效地减少了通过席窗的声音传输. 用战略位置的源和麦克风实现最佳性能,显示出显著的降噪潜力.

科学领域:

声学声学在声学方面
噪音控制工程噪音控制工程
振动和声学振动和声学

背景情况:

通过建筑元素 (如窗) 传输声音对声学舒适性构成挑战.
主动噪声控制 (ANC) 为减少不必要的声音提供了一个潜在的解决方案.
在窗户等狭窄空间中实际实施ANC需要仔细考虑组件的放置.

研究的目的:

实验性地研究主动控制对减少声音传输的有效性,通过实用的全体会议窗口.
在窗口结构中确定错误麦克风和二次取消源的最佳放置策略.
确定有效减噪所需的源和麦克风的最小数量.

主要方法:

对所有声音传输路径的传输函数进行实验测量.
在室内窗户的开启和取消源沿窗户空隙外围放置错误麦克风.
系统地改变麦克风和源配置,以评估它们对减噪的影响.

主要成果:

在户外角落附近和窗口重叠区域的取消源是最有效的.
使用六个错误麦克风,可以达到大约6dB的最大降噪.
在户外开口周围的四个取消源足以显著减少100-1000Hz之间的声音.

结论:

积极控制是可行的,以减少在全体窗户中的声音传输.
有限数量的取消源和麦克风的战略放置可以产生实质性的结果.
对双重控制系统的进一步研究可能会提高低频性能.

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