Bidirectional rough inner insertion tube type Helmholtz resonance sound absorption structure
A technology of resonant sound absorption and intubation, which is applied in the direction of sound-emitting devices and instruments, and can solve the problems of poor low-frequency sound absorption, difficulty in light weight, and difficulty in manufacturing, so as to improve acoustic impedance characteristics and enhance low-frequency Sound-absorbing characteristics and the effect of ensuring load-carrying capacity
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[0051] Examples of materials:
[0052] Alloy steel: characterized by a density of 7820kg / m 3 , Young's modulus 206GPa, Poisson's ratio 0.29.
[0053] Air: characterized by a density of 1.29kg / m 3 , sound velocity 343m / s, dynamic viscosity coefficient 1.81×10 -5 Pa·s.
[0054] Structural dimensions and material selection of comparative examples:
Embodiment 1
[0063] The diameter of the cavity is 20mm, the height of the cavity is 20mm, the average inner radius of the two-way rough inner tube is 1.5mm, the axial relative roughness of the two-way rough inner tube is 0.15, the axial wave number of the two-way rough inner tube is 0.5π, and the circumference of the two-way rough inner tube is The relative roughness is 0.1, the circumferential wave number of the two-way rough inner tube is 8, and the length of the two-way rough inner tube is 15mm.
Embodiment 2
[0065] The diameter of the cavity is 24mm, the height of the cavity is 30mm, the average inner radius of the two-way rough inner cannula is 2mm, the axial relative roughness of the two-way rough inner cannula is 0.25, the axial wave number of the two-way rough inner cannula is π, and the circumferential direction of the two-way rough inner cannula is relative The roughness is 0.15, the circumferential wave number of the two-way rough inner tube is 3, and the length of the two-way rough inner tube is 20mm.
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