Basic structural units of acoustic metamaterials and their composite structures and assembly methods

An acoustic metamaterial and basic structure technology, applied in the field of materials, can solve the problems such as the inability to effectively compensate for the total reflection peak sound insulation valley, the sound insulation effect is not as good as that of a uniform material, and the total reflection peak frequency band is narrow, etc., to achieve excellent noise reduction effect, small noise. The cost of areal density and the effect of less processing difficulty

Active Publication Date: 2019-09-13
黄礼范
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the pretension of the elastic diaphragm will slowly release the slack during long-term vibration, the effective working time of this type of material is relatively short
[0006] 3. After the three components of the basic structural unit form a total reflection phenomenon at a specific frequency, there will be a total transmission phenomenon immediately, causing the sound insulation effect in this frequency band to be far inferior to that of a uniform material
The acoustic metamaterial without counterweight mass disclosed in the patent (CN101908338B, US20140339014) is prone to multiple fully transparent frequency bands because it only relies on the vibration mode of the soft material / flexible diaphragm in the basic structural unit
[0007] 4. The frequency band of the total reflection peak is relatively narrow. In applications that require sound insulation in a wider frequency band, multiple total reflection peaks with different frequencies can only be used to isolate sound waves, and cannot effectively compensate for the sound insulation trough between the total reflection peaks. It is necessary to stack multiple layers of acoustic metamaterials, so the weight cost is extremely high, and it cannot be thin and light

Method used

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  • Basic structural units of acoustic metamaterials and their composite structures and assembly methods
  • Basic structural units of acoustic metamaterials and their composite structures and assembly methods
  • Basic structural units of acoustic metamaterials and their composite structures and assembly methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Example 1 Preparation and Performance Measurement of Basic Structural Units of Acoustic Metamaterials

[0094] Attached below Figure 3-6 The preparation and performance measurement of the basic structural units of acoustic metamaterials are described.

[0095] 1. Preparation of basic structural unit samples of acoustic metamaterials

[0096] Use FR-4 glass fiber to make a square boundary constraint frame 1 with an inner side length of 26mm, an outer side length of 29mm, and a height of 10mm. It is made of FR-4 glass fiber such as image 3 As shown in the frame constraining body 2, the boundary constraining frame 1 and the frame constraining body 2 are connected into the shape by integral molding. The first film 3 is selected to be a polyetherimide (Polyetherimide) film with a thickness of 0.05mm, and the first film 3 is connected and attached to the boundary constraint frame 1 and the frame constraint body 2 in a freely stretched state, The bonded contact area betwe...

Embodiment 2

[0105] Example 2 Preparation and Performance Measurement of Basic Structural Units of Acoustic Metamaterials with Two Layers of Thin Films

[0106] 1. Preparation of basic structural unit samples of acoustic metamaterials

[0107] Use FR-4 glass fiber to make a square bounding box 1 with an inner side length of 30mm, an outer side length of 33mm, and a height of 10mm. It is made of FR-4 glass fiber, such as Figure 7 As shown in the frame constraining body 2, the boundary constraining frame 1 and the frame constraining body 2 are connected into the shape by integral molding. Both the first film 3 and the second film 9 are selected to be a polyetherimide (Polyetherimide) film with a thickness of 0.05 mm, and the first film 3 is bound to the boundary constraint frame 1 and the frame constraints in a freely stretched state. The body 2 is connected and attached to the upper surface of the boundary constraining frame 1, and the contact area between the constraining body 2 in the f...

Embodiment 3

[0111] Example 3 Preparation and Performance Measurement of Acoustic Metamaterial Composite Structure

[0112] The basic structural units of the acoustic metamaterial prepared in Example 1 are arranged and distributed in the in-plane direction (xy plane) to form the acoustic metamaterial plate 5 . Choose 1 inch thick flow resistance rate of 21000 / Nsm -4 The glass fiber cotton board 10 and the 1mm thick 6063 aluminum alloy board 11 are made into traditional acoustic material boards. The acoustic metamaterial plate is directly contacted with the traditional acoustic material plate and slightly extruded, such as Figure 9 Acoustic composite structure shown. Measure the sound insulation of the standing wave tube, the measured curve is as follows Figure 10. Wherein, the dot solid line corresponds to the sound insulation of the sample in Example 3 of the present invention; the cross solid line corresponds to the sound insulation of the 1 mm uniform 6063 aluminum alloy plate 11 ...

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Abstract

The invention relates to an acoustic meta-material basic structure unit, and the structure unit comprises a boundary constraint frame. The interior of the boundary constraint frame is provided with an in-frame constraint body. At least one of the upper and lower surfaces of the boundary constraint frame is covered with a film. The invention also provides an acoustic meta-material plate comprising the acoustic meta-material basic structure unit, and an acoustic composite structure comprising the acoustic meta-material plate. In addition, the invention also provides a method for achieving working frequency adjustment sound insulation band of an acoustic meta-material through the change of the structural size and material parameters of the boundary constraint frame of the acoustic meta-material, the in-frame constraint body and the film. The unit is simple in assembly technology, is long in service life, restrains the vibration mode of the film, and enables the performance and stability of a sound insulating material to be improved.

Description

technical field [0001] The invention relates to a basic structural unit of an acoustic metamaterial and a composite structure containing the same, which is suitable for making sound barriers and sound insulation covers with light and thin structures and good low-frequency sound insulation effects, and belongs to the field of materials. Background technique [0002] The emergence of acoustic metamaterials, especially local resonance acoustic metamaterials, breaks through the limitation of the mass theorem of uniform sound-insulating materials, and provides a powerful tool for people to use small-scale structures to effectively control the propagation of low-frequency sound waves (2000, Zhengyou Liu et al., Locally Resonant Sonic Materials, Science289, 1734; 2008, Z. Yang et al., Membrane-Type Acoustic Metamaterial with Negative Dynamic Mass, Physical Review Letters 101, 204301.). [0003] The three components of the basic structural unit of a typical local resonance acoustic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/162
Inventor 黄礼范喻春仁
Owner 黄礼范
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