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The problem of reducing noise in the transportation is an important researchfield to prevent accidents and to provide a civilized environment for people. Amaterial that has recently attracted attention in research to reduce noise isacoustic metamaterial, and most of the research projects so far have beenlimited to the case of static media without flow. We have studied the soundtransmission properties of acoustic metamaterial with turbulent flow to developacoustic metamaterial that be used in transportation. In this paper, the effectof geometrical structure, the convective effect, and the eddy effect on soundpropagation in acoustic metamaterial with turbulent flow are investigated, andthe relationships between them are analyzed. The convective effect and the eddyeffect both reduce the resonant strength of sound transmission loss resultingfrom the unique geometry of the acoustic crystal, but shift the resonantfrequencies in opposite directions. In addition, when the convective effect andthe eddy effect of the airflow, as well as the intrinsic interaction effectgenerated from the unique geometrical structure of the acoustic metamaterialcannot be ignored, they exhibit competition phenomena with each other,resulting in a widening of the resonance peak. As a result, these three effectscause the shift of the resonance frequency of the sound transmission loss andthe widening of the resonance peak. The results of this study show that even inthe case of turbulent flow, acoustic metamaterial can be used fortransportation by properly controlling the geometric size and shape of theacoustic metamaterial.

Influence of geometric structure, convection, and eddy on sound propagation in acoustic metamaterial with turbulent flow