A large-scale underwater platform noise reduction system with cochlea-like structure

Abstract

The invention discloses a large underwater platform noise-reduction system of a cochlea-like structure. The system comprises a low-frequency broadband vibration energy gathering structure unit, a cochlea-like noise-reduction waveguide tube unit, a noise maze type superstructure unit and an active control unit. The energy gathering unit is installed on a pressure-resistant shell of a large-scale underwater platform. The energy gathered by the energy gathering unit enters the cochlea-like noise-reduction waveguide tube unit. Through the cochlea-like noise-reduction waveguide tube unit and the maze type superstructure unit, noises within the wide frequency range are collected. Meanwhile, residual low-frequency noises are eliminated through the active control unit at the tail end of the cochlea-like noise-reduction waveguide tube. Finally, the noise elimination in the full-frequency-band range is achieved. The system has the advantages of wide noise frequency band, remarkable low-frequencynoise, high noise level and the like. The system can effectively reduce the radiation noise of the large underwater platform.

Description

technical field [0001] The invention belongs to the technical field of large-scale underwater platform noise reduction, and relates to a large-scale underwater platform noise reduction system based on energy convergence, a cochlea-like waveguide, a labyrinth superstructure and an active control unit. Background technique [0002] Large underwater platforms include underwater platforms and submersibles, etc., which can complete tasks such as underwater exploration, detection, and even military offensive and defensive tasks. Now that ocean development is becoming more and more important, underwater platforms have received more and more attention from various countries, and they play an important role in both civilian and military uses. From a security point of view, a large underwater platform will emit a certain level of noise, which will increase the intensity of the sound field in the nearby sea area and become the target of the enemy's underwater acoustic detection equipme...

AI Technical Summary

Problems solved by technology

However, there is a certain upper limit to improving the sound insulation by increasing the thickness of the structure, because according to the mass law, every time the thickness of the structure doubles, the sound insulation will increase by 6dB, which means that the continuous improvement of the sound insulation requires a very thick structure. obviously unrealistic

In addition, due to the large wavelength of low-frequency sound waves and the long distance of low-frequency sound radiation, it is a frequency band that needs to be controlled emphatically, but the low-frequency sound insulation effect that ordinary structures can achieve is quite limited.

[0005] To sum up, the existing large-scale underwater platform noise reduction technology has a certain sound insulation effect on medium and high frequencies, but there are still many problems, especially the low-frequency noise reduction effect is poor, and it is urgent to develop new noise reduction technology and Existing technologies are used together to further improve the noise reduction effect

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