High-stiffness and high-damping local resonance unit for constructing acoustic metamaterial structure

An acoustic metamaterial and local resonance technology, which is applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of poor stiffness-damping comprehensive performance, weak anti-interference and protection ability, and narrow working frequency band, etc., to achieve strong protection function and overcome stiffness. - Poor comprehensive damping performance and the effect of broadening the low frequency resonance frequency band

Pending Publication Date: 2020-02-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the above-mentioned background technology, and provide a high-stiffness and high-damping local resonance unit for constructing an acoustic metamaterial structure, which can simultaneously take into account the performance of high stiffness and high damping. The low-frequency band can produce a variety of coupling resonance modes, and it also has a st

Method used

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  • High-stiffness and high-damping local resonance unit for constructing acoustic metamaterial structure
  • High-stiffness and high-damping local resonance unit for constructing acoustic metamaterial structure
  • High-stiffness and high-damping local resonance unit for constructing acoustic metamaterial structure

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Embodiment 1

[0043] The local resonance unit adopts the form of a single vibrator. The structural form of the vibrator elastic element 1 and the vibrator elastic element 3 is cylindrical, and its cross-sectional shape is circular, and its diameter and thickness are 8mm×7.6mm; the structural form of the vibrator rigid element 2 is columnar. , its cross-sectional shape is circular, its diameter and thickness are 27mm×5mm; the support and protection structure 4 adopts a cylindrical shell, the outer diameter and height of the shell are 32mm×20mm, and the thickness of the shell is 1mm; The elastic element 1 and the vibrator elastic element 3 are made of silicon rubber, the vibrator rigid element 2 is made of stainless steel, the support and protection structure 4 is made of PAL, and the total weight of a vibrator unit is about 30g. The above-mentioned local resonance units are periodically arranged on a reinforced panel with a length, width and thickness of 850mm×850mm×2.5mm to form a metamateri...

Embodiment 2

[0045] The parameters of the vibrator unit 5 in the second embodiment are the same as those in the first embodiment, and the fixed mounting surfaces of the vibrator unit 5 are the circumferential surface of the vibrator and the surface perpendicular to the axial direction of the vibrator.

[0046] The damping effect of the structure in preferred embodiment one of the present invention refers to Figure 7 It can be seen that the metamaterial plate structure of the vibrator structure of the present invention has a good vibration suppression effect, and the average longitudinal wave vibration attenuation in 100Hz-1000Hz exceeds 10dB, and the average longitudinal wave vibration attenuation in 280Hz-500Hz exceeds 20dB. From the resonance mode of the vibrator unit 5 in the preferred embodiment 2 of the present invention, it can be known that when the surface perpendicular to the axial direction of the vibrator is used as the fixed installation surface, the vibrator unit 5 has a shear...

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Abstract

The invention belongs to the field of vibration and noise control, and discloses a high-stiffness and high-damping local resonance unit for constructing an acoustic metamaterial structure. The high-stiffness and high-damping local resonance unit comprises an oscillator elastic element 1, an oscillator rigid element 2, an oscillator elastic element 3, a support and protection structure 4 and an oscillator unit 5. The oscillator elastic element 1 is firmly connected with one end of the oscillator rigid element 2; the other end of the oscillator rigid element 2 is firmly connected with the oscillator elastic element 3; and after being connected, the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are closely placed together in the support and protection structure 4 to form the vibrator unit 5. The oscillator unit 5 can simultaneously give consideration to the performance of high rigidity and high damping, can generate multiple coupling action resonance modes in a low frequency band, can effectively broaden the low-frequency resonance frequency band by designing the oscillator unit 5 or changing the installation state or the combination modethereof, and the high-stiffness and high-damping local resonance unit has an important application prospect in terms of vibration and noise reduction of modern equipment.

Description

technical field [0001] The invention belongs to the field of vibration and noise control, and relates to a local resonance unit with high rigidity and high damping for constructing an acoustic metamaterial structure. Background technique [0002] Acoustic metamaterial structure refers to a new type of acoustic structure composed of specially designed artificial acoustic microstructure units (such as local resonance units, referred to as oscillator units or oscillators) periodically embedded in the elastic structure or attached to its surface, which can obtain natural materials. The extraordinary physical properties (such as negative mass density, negative modulus, etc.) that it does not have can realize the extraordinary manipulation of elastic waves and sound waves, making it have very considerable application prospects in many fields, such as vibration reduction and noise reduction, acoustic cloak , acoustic imaging, acoustic screening, etc. [0003] The artificial acoust...

Claims

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Application Information

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IPC IPC(8): G10K11/162G10K11/172
CPCG10K11/162G10K11/172
Inventor 肖勇胡洋华郭佳佳温激鸿郁殿龙
Owner NAT UNIV OF DEFENSE TECH
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