Research on Low-Frequency Noise Control Based on Fractal Coiled Acoustic Metamaterials

Figure 5

Sound pressure distribution for each order metamaterial structure. (a) 214 Hz overall sound pressure distribution. (b) 725 Hz single-layer sound pressure distribution. (c) 1013 Hz single-layer sound pressure distribution. (d) 119 Hz overall sound pressure distribution. (e) 833 Hz single-layer sound pressure distribution. (f) 1569 Hz single-layer sound pressure distribution. (g) 69 Hz overall sound pressure distribution. (h) 905 Hz single-layer sound pressure distribution. (i) 1576 Hz single-layer sound pressure distribution.

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