A preparation method of thermo-acoustic two-field metamaterial for heat and noise environment

Abstract

The invention discloses a preparation method for thermal-acoustic two-field metamaterials under the thermal noise environment. Local resonance acoustic-metamaterial unit cells composed of epoxy resinmatrixes, rubber elastic coating layers and hard-quality core lead, and limited-size local resonance acoustic-metamaterial thin plates formed by periodic arrangement are included. The epoxy resin matrixes of all the unit cells are replaced with a laminated-type thermal-metamaterial formed by alternate laminating of latex and silicone rubber; or elastic resonance units composed of the hard-qualitycore lead coated with the rubber elastic coating layers are embedded in a particle-filled thermal-metamaterial formed in the mode that a base material is filled with non-spherical nanometer particles.The two functional requirements of heat shielding and noise reduction of the structure under the multi-field service environments are met.

Description

technical field [0001] The invention belongs to the technical field of structural heat protection, vibration reduction and noise reduction material design. Mainly based on the existing research basis of anisotropic thermal metamaterials and local resonance acoustic metamaterials, the theoretical design and preparation methods of thermal-acoustic two-field metamaterials are carried out, which are specifically applied to the multi-field service environment of cutting-edge equipment structures Thermal protection, vibration reduction and noise reduction function requirements. Background technique [0002] Metamaterials (or metamaterials) that have emerged in recent years are artificially designed materials that have properties that natural materials do not have, such as negative Poisson's ratio, negative refractive index, negative modulus, and negative density. Taking acoustic supermaterials as an example, the local resonance acoustic metamaterial proposed by Liu Zhengyou et al...

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Problems solved by technology

[0003] However, at present, both acoustic metamaterials and thermal metamaterials are mostly limited to the research of a single physical field.

Considering the joint mechanism between the thermal field and the acoustic field, the design of thermal-acoustic supermaterials for (medium and low frequency) sound insulation and heat protection has not yet been involved, and its research, design and application are still blank in the world

In 2013, Martin Maldovan published a paper in Nature, which is designed based on the Bragg scattering mechanism and has the functions of sound insulation and heat absorption. It lacks practicality for a wider range of low-frequency noises in equipment structures.

[0007] Due to the different types of equations describing the thermal field and sound field, and the variables and responses have different physical concepts, dimensions and magnitudes, etc., it is impossible to describe them uniformly

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