Viscoelasticity composite sound insulating board

Abstract

The invention discloses a viscoelasticity composite sound insulating board. The sound insulating board comprises a damping layer (1), a sound insulating layer (2) and a sound absorption layer (3) which are sequentially arranged. One side of the damping layer (1) is attached to the surface of a shell of an underwater moving body, and the damping layer (1) is made of isotropous polyurethane or macromolecule resin. The sound insulating layer (2) is made of polyolefin elastomers or glass fibers. The sound absorption layer (3) is made of photosensitive resin, and closed cavities (4) are arranged in the sound absorption layer (3) in an array mode. According to the viscoelasticity composite sound insulating board, the damping layer can achieve the purposes of reducing vibration and absorbing noise; the sound insulating layer achieves a reinforcing effect, so that the entire composite sound insulating board has certain mechanical strength integrally, and meanwhile the sound insulating capacity of the multi-layer structure in a low-middle frequency band is adjusted; the sound absorption layer absorbs outside noise, reflection echoes are reduced, and due to the fact that the cavities are formed in the sound absorption layer, the sound absorption effect is further enhanced. By means of the viscoelasticity composite sound insulating board, low-frequency noise of underwater ships can be effectively absorbed, and the structure is simple.

Description

technical field [0001] The invention relates to a sound-absorbing structure, in particular to a multi-layer composite acoustic structure for underwater sound with a viscoelastic sound-absorbing layer. Background technique [0002] Underwater acoustic materials refer to the acoustic materials used in underwater facilities. With the emergence of nuclear-powered submarines and the development of underwater weapons, underwater detection technology plays an extremely important role. In recent years, nuclear submarines, large warships, super oil tankers and The number of passenger and cargo ships is increasing day by day, so the requirements for underwater acoustic system and underwater noise control are also getting higher and higher. At the same time, the types of shrouds, sound-transmitting windows, baffles, reflectors, anechoic coverings, and volumetric sound absorbers are also increasing, which greatly promotes the development of underwater acoustic materials. [0003] Under...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a viscoelastic composite sound insulation board to solve the technical defect that the underwater acoustic material in the prior art cannot fully meet the requirements of use, and has good sound absorption, anti-sound and sound insulation function, effectively reducing the occurrence of sound leakage

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