Acoustic propagation characteristics of heteromorphic metamaterials

作者：Han, Jianning; Tang, Shuai^*

来源：AIP Advances, 2018, 8(10): 105305.

DOI：10.1063/1.5052293

• BLOCH WAVES

To explore the propagation characteristics of acoustic waves in heterogeneous acoustic materials, we studied the propagation of acoustic waves in resonant phononic crystals. We identified the vibration mechanism of two-dimensional three-component localized resonant phononic crystals. Using the finite element software COMSOL, an acoustic propagation model based on acoustic metamaterials was constructed and the local resonance characteristics of acoustic waves and the original cells were used to simulate multiple acoustic models based on triangular arrays. We found that the planar point-like and linear excitation sources incident from the bottom edge of the triangular array model converge to the focal point at the top corner after being controlled by the model. The low-loss movement effect of the point source could be achieved in a rectangular model with a triangular array. A reversal of the transmission of plane acoustic waves resulted when two or three identical triangular arrays were combined into a parallelogram or a trapezoid. This series of abnormal acoustic phenomena provides new directions for the detection of point sources, low-loss directional transmission of acoustic waves, and acoustic stealth.

• 出版日期2018-10
• 单位中北大学