1results about How to "Good environmental tolerance" patented technology

The application discloses a kind of low-frequency broadband sound-absorbing metamaterial structures and super-constructed sound barriers based on metal foam, and the metamaterial structure includes metal foam layer and composite resonant cavity layer, and the metal foam layer and the composite resonant cavity layer are stacked;Composite resonant cavity layer includes mother cavity structure and sub-cavity structure, and the sub-cavity structure is embedded in the mother cavity structure, and the mother cavity structure and the sub-cavity structure are all provided with openings towards the metal foam layer, so that the incident sound wave can enter the mother cavity structure and the sub-cavity structure after propagating through the metal foam layer;The cavity of mother cavity structure and sub-cavity structure is unidirectional equal-section cavity.The application is applied to the field of acoustic noise reduction, realizes the high-efficiency sound-absorbing performance of low frequency and wide band, has high stiffness and strength and excellent environmental adaptability, can bear, has good environmental tolerance, has excellent fireproof performance, is suitable for various complex and severe environments, ensures long-term stable working state, is convenient for low-cost mass production, and improves economic feasibility.