Abstract：An engine acoustic liner model based on gradient acoustic hypersurface is proposed by designing a slit element array with variable length.Numerical simulation models and theoretical calculation models of the acoustic characteristics of the metasurface acoustic liner are established, noise reduction characteristics and mechanism are analyzed, and effects of changing the structural parameters and the spatial layout of the acoustic liner on the noise reduction characteristics are explored. Finally, the noise reduction effect of the metasurface acoustic liner is verified by experiments.The results show that the metasurface structure significantly expands the noise reduction frequency band of the acoustic liner to low frequency, and significantly expands its noise reduction frequency band. The analysis shows that the spatial layout of the acoustic liner also has a great influence on its noise reduction effect.
白宇，郁殿龙，张振方，蔡力. 一种基于声学超表面的管道消声声衬设计研究[J]. 振动与冲击, 2023, 42(8): 289-295.
BAI Yu, YU Dianlong, ZHANG Zhenfang, CAI Li. An engine acoustic liner based on acoustic metasurface. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(8): 289-295.
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