Miniaturized Spiral Metamaterial Array for a Ventilated Broadband Acoustic Absorber

<div>(a) The acoustic reduction coefficient for the rectangular channel with one Archimedean spiral unit. The inset shows the acoustic pressure distribution in the peak frequency. (b) The comparison of the same spiral unit array and the middle-reversed array for the acoustic reduction coefficient. The insets show the corresponding acoustic pressure distributions in peak frequencies.</div>

Shock and Vibration

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Figure 2

Figure 2: Miniaturized Spiral Metamaterial Array for a Ventilated Broadband Acoustic Absorber 