Sound absorption and insulation sheet for maintaining ecology of passenger cabin of ship

Abstract

The invention provides a sound absorption and insulation sheet for maintaining ecology of a passenger cabin of a ship, which comprises an arc-shaped composite sheet, the arc-shaped composite sheet is formed by pressing a plurality of noise reduction materials, the cross section of the arc-shaped composite sheet is arc-shaped, and a plurality of sound absorption grooves tangent to the arc surface are formed in the outer end of the arc-shaped composite sheet; a sound direction adjusting piece and a sound absorption device are sequentially arranged in the sound absorption groove in the depth direction from the end, close to a groove opening, of the sound absorption groove. The sound absorption device comprises an elastic film layer, a metal mass block, composite fiber layers, and a movable cover body; wherein the elastic film layer is arranged in the sound absorption groove and divides the sound absorption groove into an outer cavity and an inner cavity, the metal mass block is arranged in the center of the elastic film layer, and the composite fiber layers are bonded to the two sides of the elastic film layer through viscous-state damping glue, and the movable cover body is connected with the outer edges of the composite fiber layers and can define a rear cavity. Through the invention, the influence of low-frequency noise on the interior of the passenger cabin is effectively reduced, and effective sound absorption and insulation treatment can be performed on noise with high penetrating power and other noise with low penetrating power.

Description

technical field [0001] The invention relates to the technical field of noise reduction in a ship's cabin, and more particularly relates to a sound-absorbing and sound-insulating sheet for maintaining the ecology of a ship's cabin. Background technique [0002] With the rapid development of the shipbuilding industry, the noise problem of the propulsion main engine and diesel generator set in the ship engine room is becoming more and more serious. Since the propulsion power of the ship and the generator set are arranged in the narrow engine room, the two major noise sources in the engine room: the noise of the propulsion main engine and the noise of the generator set make the working environment in the engine room very bad. In addition, the work of the crew in the engine room Therefore, this strong noise not only seriously affects the work efficiency of the crew, damages their physical and mental health, but also seriously pollutes the surrounding sound environment. Ship nois...

AI Technical Summary

Problems solved by technology

[0003] Ship noise sources include aerodynamic noise, oil extraction machine noise, auxiliary machinery noise, propeller noise, hull vibration noise, hydrodynamic noise, metal impact and friction noise. The main measures to reduce ship noise include controlling noise sources , such as adding a sound insulation cover, installing a sound insulation barrier, and controlling the path of the noise ship, that is, arranging sound-absorbing materials around the cabin or on the ceiling. Sound waves form vibrations inside the material, increase the molecular friction of the material, and convert the vibration into heat energy. However, according to actual measurements, after using the sound insulation cover, although the noise is reduced, the effect is not too obvious, and the sound-absorbing material is affected by the environment. Large and doesn't work well

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