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Low-frequency broadband quasi-periodic sound insulation structure with gradient change of impedance and thickness

A gradient change, quasi-periodic technology, applied in the direction of sounding equipment, instruments, etc., can solve the problem of limited effective bandwidth and attenuation, and achieve the effect of strong designability, simple manufacturing process and wide selection range

Active Publication Date: 2020-09-15
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure uses a non-uniform local resonance quasi-periodic structure composed of epoxy resin, rubber and small steel blocks to realize the suppression of low-frequency sound wave propagation by small-scale structures, but its effective bandwidth and attenuation are very limited.

Method used

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  • Low-frequency broadband quasi-periodic sound insulation structure with gradient change of impedance and thickness
  • Low-frequency broadband quasi-periodic sound insulation structure with gradient change of impedance and thickness
  • Low-frequency broadband quasi-periodic sound insulation structure with gradient change of impedance and thickness

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Effect test

Embodiment 1

[0031] combine figure 1 , the parameters of the low-frequency broadband quasi-periodic sound insulation structure with impedance and thickness gradient changes are: Z A1 =2.2×10 6 kg / m 2 / s, Z B1 =34×10 6 kg / m 2 / s, Δd=0.2cm, ΔZ A =2×10 5 kg / m 2 / s, ΔZ B =2.25×10 6 kg / m 2 / s. The impedances of the two homogeneous media used in traditional periodic structures are 2.2×10 6 kg / m 2 / s and 34×10 6 kg / m 2 / s, and the thickness of each layer of medium is 3cm. Both structures have a period number of 5 and a total thickness of 30 cm.

[0032] figure 2 Medium A in the quasi-periodic structure 1 、A 2 、A 3 、A 4 、A 5 The impedance change curve, image 3 Medium B in the quasi-periodic structure 1 , B 2 , B 3 , B 4 , B 5 The impedance change curve. Figure 4 It is the band gap comparison result of the traditional periodic structure and the low-frequency broadband quasi-periodic sound insulation structure with impedance and thickness gradient changes. It can be s...

Embodiment 2

[0034] combine figure 1 , the parameters of the low-frequency broadband quasi-periodic sound insulation structure with impedance and thickness gradient changes are: Z A1 =2.6×10 6 kg / m 2 / s, Z B1 =34×10 6 kg / m 2 / s, Δd=0.5cm, ΔZ A =3×10 5 kg / m 2 / s, ΔZ B =3×10 6 kg / m 2 / s. The impedances of the two homogeneous media used in traditional periodic structures are 2.6×10 6 kg / m 2 / s and 34×10 6 kg / m 2 / s, and the thickness of each layer of medium is 3cm. Both structures have a period number of 5 and a total thickness of 30 cm.

[0035] Figure 5 Medium A in the quasi-periodic structure 1 、A 2 、A 3 、A 4 、A 5 The impedance change curve, Figure 6 Medium B in the quasi-periodic structure 1 , B 2 , B 3 , B 4 , B 5 The impedance change curve. Figure 7 It is the band gap comparison result of the traditional periodic structure and the low-frequency broadband quasi-periodic sound insulation structure with impedance and thickness gradient changes. It can be see...

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Abstract

The invention provides a low-frequency broadband quasi-periodic sound insulation structure with gradient change of impedance and thickness. The quasi-periodic structure is formed by periodically arranging a series of homogeneous media with gradient change of impedance and thickness. Compared with a traditional periodic structure, a lower band gap and a wider band gap can be obtained under the quasi-periodic structure of the same size, the manufacturing process is simple, designability is high, the medium selection range is wide, and the quasi-periodic structure is suitable for application in the aspect of vibration and noise reduction.

Description

technical field [0001] The invention relates to a quasi-periodic structure, in particular to a low-frequency broadband quasi-periodic sound insulation structure with impedance and thickness gradient changes, belonging to the technical field of vibration reduction and noise reduction. Background technique [0002] The traditional periodic structure is a composite structure composed of two or more elastic media arranged in a certain periodicity, and the thickness, impedance and type of the media used in each period remain unchanged; while The quasi-periodic structure is essentially a special periodic structure. When the thickness, impedance or type of one or more layers of medium in the traditional periodic structure is changed, and the original periodicity is destroyed, the traditional periodic structure will change. will change into a quasi-periodic structure. [0003] Compared with the traditional periodic structure, the quasi-periodic structure also has a series of phonon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16
CPCG10K11/16
Inventor 胡博李明杰陈聪杜逸眉时胜国方尔正莫世奇张揽月时洁李松
Owner HARBIN ENG UNIV
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