Sound diode based on time-dependent modulation
A technology of acoustic diodes and acoustic waveguides is applied in the directions of sound-producing instruments, measuring ultrasonic/sonic/infrasonic waves, and measuring devices. Effect
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[0021] The design of the elliptical cylinder and filter structure in the diode based on time-dependent modulation and the analysis of the effective parameters are completed by COMSOL Multiphysics numerical simulation, and the test and analysis of the acoustic performance of the diode is completed by B&K3560-C signal analyzer. figure 1 Shown is a schematic diagram of the diode structure based on time-dependent modulation of the present invention. The marks in the figure are: elliptical cylinder 1, acoustic waveguide 2, Helmholtz resonant cavity 3, waveguide length l, width w, height h, wall thickness d, semi-major axis a and semi-minor axis b of the cross-section of the elliptical cylinder, high h 1 , the Helmholtz cavity period m. The specific parameters are l=1.5m, w=25mm, h=0.1m, d=1.25mm, a=8mm, b=4mm, h 1 =9cm, m=5cm. The acoustic waveguide 2 is made of rigid material, such as aluminum alloy. The elliptical column 1 is embedded in the waveguide, made of nylon material,...
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