Composite expanded graphite broadband noise reduction structure from low frequency to high frequency

The utility model discloses a low-frequency-to-high-frequency broadband noise reduction structure of composite expanded graphite, the noise reduction structure is a multi-layer honeycomb sandwich structure with a skin, and the layers of honeycombs and one side facing noise of the multi-layer honeycomb sandwich structure with the skin are bonded by adopting microwell plates through damping glue; the multi-layer honeycomb sandwich structure with the skin is filled with a composite foam material of expanded graphite and resin, and the side, not facing noise, of the multi-layer honeycomb sandwich structure with the skin is a substrate without micropores. The product has the advantages of environmental protection, high mechanical strength, low density, long service life, high temperature resistance, flame retardance and the like, and overcomes the defects of poor low-frequency performance, insufficient bandwidth, low strength, flammable foam and the like of a sound absorption and noise reduction material. 本申请公开了一种