实现宽带二维非互惠声学使用一个活跃的声学元表面的实现
Joe Tan1, Jordan Cheer1, Charlie House1
1Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom.
The Journal of the Acoustical Society of America
|August 20, 2024
概括
这项研究展示了一种新的方法,用于使用活跃的超表面控制声波. 该系统实现了宽带非互惠的声音吸收,为声波传播提供了可重新配置的控制.
科学领域:
- 声学 声学 在声学方面
- 超材料是指一种超材料.
- 波浪控制系统的波浪控制.
背景情况:
- 非互惠的声学装置以方向控制波浪的传播.
- 由于固定的定向偏差,现有的方法往往缺乏重新配置性.
- 活动控制器为声系统的动态控制提供了潜力.
研究的目的:
- 调查基于前波的主动控制器用于宽带非互惠的声音吸收.
- 将概念从1D扩展到由活跃单元细胞组成的2D元表面.
- 为了证明对声波传播的可重新配置控制.
主要方法:
- 使用前波式主动控制器来驱动一系列亚波长主动单元电池.
- 开发用于二维声学控制的超表面配置.
- 采用模拟和实验研究来验证系统的性能.
主要成果:
- 在二维平面上实现宽带非互惠的声音吸收.
- 证明对正常和斜撞击波的有效控制.
- 验证了基于主动波的吸收控制系统的可重新配置性.
结论:
- 集成到元表面的基于波的主动控制系统可以实现宽带非互惠的声音吸收.
- 这种方法为定向声波操纵提供了可重新配置的解决方案.
- 这些发现为具有可调节功能的先进声学设备铺平了道路.
相关概念视频
00:53Sound Waves: Interference
3.7K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.7K
01:06Echo
498
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
498