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

Figure 6

Particle velocity distributions of the metamaterial structures of each order. (a) 214 Hz centre plane particle velocity distribution. (b) 400 Hz centre plane particle velocity distribution. (c) 119 Hz centre plane particle velocity distribution. (d) 200 Hz centre plane particle velocity distribution. (e) 69 Hz centre plane particle velocity distribution. (f) 150 Hz centre plane particle velocity distribution.

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