Light two-component soft thin layer local resonance acoustic material structure

A technology of local resonance acoustics and material structure, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of large space occupation, noise amplification, and lack of sound insulation effect, etc., and achieve the effect of simple design, easy processing and manufacturing

Inactive Publication Date: 2014-08-20
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Resonance causes the sound insulation of the body in this frequency band to be very low, sometimes not only does not achieve the sound insulation effect, but also amplifies the noise
However, the existing new acoustic mat

Method used

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  • Light two-component soft thin layer local resonance acoustic material structure
  • Light two-component soft thin layer local resonance acoustic material structure
  • Light two-component soft thin layer local resonance acoustic material structure

Examples

Experimental program
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Embodiment Construction

[0033] (1) The same light and flexible material as the elastic element and mass element

[0034] The present invention uses silicon rubber with good elasticity as the elastic element and mass element, and the elastic element is designed as a film type, that is, a silicon rubber film with a thickness of no more than 1mm; the quality block is designed to be hemispherical, cylindrical, or square. Among them, the radius of the hemisphere does not exceed 5mm, and the thickness of the cylinder and the box does not exceed 2mm. For the convenience of illustration, several shapes of two-component local resonance units are designed, and the cell structure is as follows figure 1 shown. Each cell consists of 3 parts, mass block, film and frame. Both the quality block and the film are made of flexible silicone rubber, and the frame is made of plastic with better toughness or softer EVA (EVA (ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer). The quality block is divided...

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Abstract

The invention discloses a light two-component soft thin layer local resonance acoustic material structure. The same kind of light flexible materials provide weight and elasticity, and another kind of light flexible materials provide a two-component soft thin type local resonance unit with local rigidness. The local resonance unit can control transmission of mechanical waves 2-3 magnitude orders larger than structure size, and a wide band gap is achieved. According to the structure, a full band gap can be opened under the low-frequency stage below 500 Hz, a vertical band gap can be formed at the super-low-frequency stage below 100 Hz, and the requirements for low-frequency damping and noise reducing of thin-wall pieces such as a carrying tool can be well met. The designed structure has the advantages of being low in thickness, light in weight, soft, wide in vertical band gap and convenient to machine, material cost is low, the structure can be directly arranged on carrying tools such as a bus and a train conveniently, and an effective solution is provided for low-frequency damping and noise reducing of a practical carrying tool.

Description

【Technical field】 [0001] The invention belongs to the technical field of lightweight two-component flexible thin-layer local resonance acoustic material, and in particular relates to a light-weight two-component flexible thin-layer local resonance acoustic material structure. 【Background technique】 [0002] Existing sound insulation materials are generally materials with high hardness, such as steel plates and the like. First of all, these materials are relatively hard and heavy, and it is difficult to meet the actual noise reduction requirements in aerospace and other fields that require high weight reduction. In addition, these sound insulation materials have good sound insulation in the high frequency band, but in the low frequency band below 500Hz, the sound insulation performance is very poor, and sometimes even amplify the noise due to their own resonance. This severely restricts the design of sound insulation components of vehicles and hall sound insulation materials...

Claims

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Application Information

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IPC IPC(8): G10K11/162G10K11/172
Inventor 吴九汇马富银张思文张炜权付刚雷浩
Owner XI AN JIAOTONG UNIV
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