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

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...

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 materials either have bulky structures, take up a large space, are inflexible in layout, or are too brittle and hard in structure, or have unstable acoustic performance, or cannot achieve good low-frequency acoustic effects.

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