Abstract
The suppression of low-frequency waves has been a challenging task for acoustic black hole (ABH) because a small truncation of the ABH tip would fail to prevent the transmission of low-frequency waves below the cutoff frequency. Here, we propose a novel approach to achieve perfect ABH to suppress the wave propagation at low frequencies in the range of 3–100[Formula: see text]Hz. Structurally, the perfect ABH consists of two ABHs with rigid materials and a soft material connected between the two ABHs to break the cutoff frequency limit and achieve attenuation of up to 21.3[Formula: see text]dB in the 3–20[Formula: see text]Hz range. The wave energy focusing effect possessed by ABHs, combined with the impedance mutation on the surface where soft and hard materials are connected, can concentrate the wave energy within the soft material, thus achieving a perfect ABH effect. The proposed perfect ABH compensates the defect that ABH cannot suppress low-frequency and sub-low-frequency waves, and provides the possibility of full-band suppression.
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