Abstract
We report a composite waveguide fabricated by attaching a coupling aperture to a waveguide. The acoustic impedance of the composite waveguide can be regulated by merely controlling its coupling vibrations, depending on its structure size. By changing the size to adjust the acoustic impedance of the composite waveguide at an impedance-mismatched fluidic interface, tunable sound transmission at the desired frequencies is achieved. The reported composite waveguide provides a new method for sound regulation at a mismatched fluidic interface and has extensive frequency hopping and frequency agility applications in air-water sound communication.
Highlights
We report a composite waveguide fabricated by attaching a coupling aperture to a waveguide
Lu and Christensen revealed that the coupling effect between the diffractive wave and the waveguide mode plays an important role in this extraordinary sound transmission[3,4]
The finite element method (FEM) results were compared with those obtained using Eq 4
Summary
We designed a slit array in which each slit is a composite waveguide that enabled tunable sound transmission at an air-water interface. Z1 can be approximately described by the acoustic impedance Zc. Considering the effects of the coupling aperture, the sound pressure transmission coefficient TP through the composite waveguide can be written as TP. When designing tunable sound transmission, the relationships Z1Yt =Γand Z1 ≠ 0 can be satisfied at the non-resonant states by adjusting the non-zero imaginary parts on both sides of Eq (7). The tunable frequency range of total sound transmission could be further increased by controlling the length of the coupling aperture
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