D-type meta-structure acoustic liner sound insulation barrier and preparation system and preparation method thereof

The invention relates to the technical field of noise reduction, and discloses a D-type meta-structure acoustic liner sound insulation barrier and a preparation system and method thereof.The D-type meta-structure acoustic liner sound insulation barrier comprises a body, a plurality of middle sound absorption layers with different thicknesses and different spacing distances are arranged in the body, air layers are formed between the middle sound absorption layers, and the air layers are arranged in the middle sound absorption layers. Plugging plates are arranged at the two ends of the body, and the body comprises a frame, a sound absorption surface layer and a sound insulation layer which are formed by bending the same metal plate. The middle sound absorption layer is an ultra-micro sound absorption pore plate; the ultra-micro sound-absorbing pore plates which are made of different materials and have different thicknesses are arranged in the sound insulation barrier, the sizes of the sound-absorbing pores in t