Broadband multi-layer composite sound absorbing structure for ships

Abstract

The invention provides a broadband multi-layer composite sound absorbing structure for ships, comprising a panel layer, a first sound-absorbing material layer, a micro-perforated panel, a second sound-absorbing material layer and a back board layer; and the total thickness of the first sound-absorbing material layer and the second sound-absorbing material layer is 50 mm to 70 mm. The broadband multi-layer composite sound-absorbing structure for ships provided by the invention has a multi-layer structure and introduces two porous sound-absorbing material layers, thus can effectively achieve free combination of sound-absorbing material layers for broadband noise sources, has a good sound absorption effect on both low-frequency and medium-frequency noise and has very good military and socialbenefits.

Description

technical field [0001] The invention relates to the field of vibration and noise reduction for ship cabins, in particular to a ship-used broadband multilayer composite sound-absorbing structure. Background technique [0002] When the ship is running, the operation of mechanical equipment will generate a lot of noise. In order to protect people on board from noise and have a quiet and comfortable living and working environment, in addition to sound insulation treatment, it is also necessary to improve the form of the protective structure and improve the sound absorption performance of the protective structure. [0003] From the perspective of the sound absorption mechanism, generally porous sound-absorbing materials have a better sound absorption effect in the high-frequency range, while the micro-perforated structure has a better sound absorption effect in the low-frequency range. Moreover, there are troughs in the absorption of sound wave spectrum by any single material, t...

AI Technical Summary

Problems solved by technology

Moreover, there are troughs in the absorption of the sound wave spectrum by any single material, that is, when the mass of the sound-absorbing material increases, the absorption effect of sound waves of a certain frequency is not significantly improved, which indicates that the frequency range of the sound-absorbing effect of the material can no longer be extended. further improved

Most of the existing sound-absorbing structures have good effects for specific frequency ranges, and there is a lack of sound-absorbing structures that have good sound-absorbing effects in a wide frequency range from low to high, and have appropriate weight and thickness.

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