Quan Li, Qian Feng, Liu Xiaozhou, Gong Xiufen
Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.
J Acoust Soc Am. 2015 Aug;138(2):782-90. doi: 10.1121/1.4926898.
Research has shown that acoustic transmission enhancement (ATE) can occur in stiff materials with high acoustic impedance that include a soft interlayer with low acoustic impedance inserted between them without any opening (i.e., without any links between the two stiff materials). Previously, ATE was induced either by coupling acoustic surface waves or Love waves with the Fabry-Perot resonant modes inside the apertures or by the locally resonant modes of the structure. However, in this article ATE is achieved using wave-vector redistribution induced by a reactance boundary. An optimal boundary was designed to adjust the wave vector in the propagation direction, decreasing reflection caused by impedance differences. The role of boundary conditions on ATE was also clarified.
研究表明，声传输增强（ATE）可发生在具有高声阻抗的刚性材料中，这些材料包含一个低声阻抗的软夹层，该夹层插入在它们之间且无任何开口（即，两个刚性材料之间无任何连接）。此前，ATE是通过将声表面波或乐甫波与孔内的法布里 - 珀罗共振模式耦合，或通过结构的局部共振模式来实现的。然而，在本文中，ATE是利用电抗边界引起的波矢重新分布来实现的。设计了一个最优边界来调整传播方向上的波矢，减少由阻抗差异引起的反射。还阐明了边界条件对ATE的作用。
