Adjustable single-frequency underwater acoustic one-way transmission device under linear system
A linear system and one-way transmission technology, applied in the field of acoustic metamaterials, can solve the problems of lack of frequency uniqueness and adjustability, unfavorable underwater precision filtering, underwater acoustic confidential communication, etc.
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Embodiment 1
[0027] combined with figure 1 As shown, a tunable single-frequency underwater acoustic one-way transmission device under a linear system includes a one-dimensional periodic grid plate and an "aluminum-water" twin-crystal structure; the "aluminum-water" twin-crystal structure is composed of Two one-dimensional fluid-solid phononic crystals with a period of 5 are separated by a certain distance, and the space between the two single crystals forms a resonant cavity; the one-dimensional periodic grid plate is located on the side of the "aluminum-water" twin crystal structure .
[0028] Wherein, the thickness of the water layer of the two one-dimensional fluid-solid phononic crystals with a period number of 5 is d 1 =4mm, the thickness of the solid plate is d 2 =4mm; the distance between the one-dimensional periodic grid plate and the "aluminum-water" twin crystal structure is d 0 =2mm, the cross-section of the one-dimensional periodic grid plate is a rectangle, wherein the heig...
Embodiment 2
[0038] The adjustable single-frequency underwater acoustic one-way transmission device model under the linear system is established by COMSOL Multiphysics finite element simulation. Now keep the "aluminum-water" twin crystal structure and the structural parameters of the one-dimensional periodic grid plate unchanged, that is, d 1 = 4mm, d 2 = 4mm, d R =12mm, h=10mm, w=2mm, select grid constant as A 1 = 20mm. image 3 (a) The sound pressure distribution diagrams of the forward and reverse vertical incident sound waves with a frequency of 150644.494 Hz are given, from image 3 The obvious one-way transmission of sound waves can be seen in the sound pressure distribution of forward and reverse incidence. like image 3 As shown in (b), the transmission curves of the forward and reverse normal incidence of sound waves in the frequency range of 150000Hz-152000Hz are given. When the sound wave is vertically incident, due to the resonant tunneling effect, the forward transmittan...
Embodiment 3
[0041] The tunable narrowband unidirectional transmission device model is established by COMSOL Multiphysics finite element simulation. Now keep the "aluminum-water" twin crystal structure and the material parameters of the one-dimensional periodic grid plate unchanged, that is, d 1 = 4mm, d 2 =4mm, h=10mm, w=2mm, A=16mm, select the thickness of the resonant cavity as d R1 = 8mm. Figure 5 (a) The sound pressure distribution diagrams of the forward and reverse vertical incident sound waves with a frequency of 147315.4 Hz are given, from Figure 5 The obvious one-way transmission of sound waves can be seen in the sound pressure distribution of forward and reverse incidence. like Figure 5 As shown in (b), the transmission curves of the forward and reverse normal incidence of sound waves in the frequency range of 144000Hz-150000Hz are given respectively. When the sound wave is vertically incident, due to the resonant tunneling effect, the forward transmittance of the sound ...
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