Compound sound insulation structure of hovercraft and installing process of compound sound insulation structure

The invention discloses a compound sound insulation structure of a hovercraft and an installing process of the compound sound insulation structure, and belongs to the technical field of hovercraft sound insulation. The compound sound insulation structure is technologically characterized by comprising a porous aluminum plate attached to the inner wall of a roof or bulkhead of a bin, a sound absorption layer is arranged between the porous aluminum plate and the roof or bulkhead and is formed by combining a plurality of sound absorption units, each sound absorption unit comprises a porous sound absorption material and a high-count high-density nylon fabric wrapping the outer surface of the porous sound absorption material. The installing process of the compound sound insulation structure includes the steps of preparing the sound absorption units, combining and forming the sound absorption layer, assembling an air layer, installing a sound insulation layer and the porous aluminum plate, and installing a decoratio