Local resonance type acoustic metamaterial low-frequency sound absorption and insulation structural member

Abstract

The invention discloses a local resonance type acoustic metamaterial sound absorption and insulation structural member which comprises an elastic column, scatterers and a steel backing, the elastic column is connected to the steel backing, and a plurality of layers of circular scatterers with the same thickness and the diameters increasing in an equivalent mode are embedded into the elastic column at equal intervals from bottom to top; the elastic column is made of rubber, and the steel backing and the scatterer are made of steel. On the basis of the local resonance principle, the scattering bodies are evenly embedded into the elastic columns, sound waves are subjected to resonance coupling of the elastic columns and the scattering bodies and blocking of the steel backing, the sound absorption broadband is widened to be as low as 200 Hz, even the perfect sound absorption effect can be achieved at a certain specific frequency, meanwhile, the sound insulation index is increased to 97 dB, and excellent sound absorption and insulation performance is shown in a low broadband range. The structure is simple to prepare and low in cost, and engineering application value is provided for noise control in a low-frequency range.

Description

technical field [0001] The invention relates to a sound-absorbing and insulating structure, in particular to a local resonance type acoustic metamaterial low-frequency sound-absorbing and insulating structure, which belongs to the technical field of acoustic metamaterials. Background technique [0002] In recent years, with the development and progress of science and technology, the problem of low-frequency noise has become increasingly serious in various fields such as shipbuilding and industry. It not only brings serious safety hazards to precision instruments and equipment in the field, but also seriously endangers the life and health of operators. The existing low-frequency noise control is generally a large concrete structure or a composite structure with a relatively complex structure, which is not only difficult to prepare but also expensive. Due to the long sound wave of low-frequency noise, it attenuates slowly in the air and has strong penetrating ability. It is di...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the development and progress of science and technology, the problem of low-frequency noise has become increasingly serious in various fields such as ships and industries. It not only brings serious safety hazards to precision instruments and equipment in the field, but also seriously endangers the life and health of operators.

The existing low-frequency noise control is generally a large concrete structure or a composite structure with a relatively complex structure, which is not only difficult to prepare but also expensive

Due to the long sound wave of low-frequency noise, it attenuates slowly in the air and has strong penetrating ability. It is difficult for traditional materials to achieve effective sound attenuation effect due to their weak inherent loss.

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