Active control methods have shown their effectiveness in reducing noise transmitted through single- or double-panel barriers. However, when the availability of high-performance processors and energy sources is limited, it is worth considering alternative solutions, including semi-active methods. They can offer considerable levels of noise reduction with limited resources and lower application costs. This paper investigates a novel semi-active control approach for double-panel noise barriers, where bistable links mounted between the panels are structurally coupled, when turned on, or decoupled, when turned off. These semi-active links only require energy when switching between states. The structural couplings significantly alter natural frequencies and mode shapes of the vibroacoustic system. This enables an adaptation of structural response dependent on the noise spectrum, i.e. minimizing the radiation in the targeted frequency bands. Such an approach is especially feasible in case of non-stationarynarrow-band noise, which is very common in real-life. Analysis of experimental results shows that the acoustic radiation of the a noise barrier can be reduced by as much as 16 dB for targeted resonance frequencies.

主动控制方法已显示出它们在减少通过单板或双板屏障传递的噪声方面的有效性。但是，当高性能处理器和能源的可用性受到限制时，值得考虑使用替代解决方案，包括半主动方法。它们可以利用有限的资源和较低的应用成本来提供相当水平的降噪。本文研究了一种用于双面板隔音屏障的新型半主动控制方法，其中，安装在面板之间的双稳态连杆在开启时是结构耦合的，在关闭时是解耦的。这些半主动链路仅在状态之间切换时才需要能量。结构耦合显着改变了振动声学系统的固有频率和振型。这使得能够根据噪声频谱来调整结构响应，即，将目标频带中的辐射最小化。这种方法在非平稳窄带噪声的情况下尤其可行，这在现实生活中非常普遍。对实验结果的分析表明，对于目标谐振频率，隔音屏障的声辐射可以减少多达16 dB。