A multi-layer composite acoustic structure for underwater acoustics

Abstract

The invention belongs to the technical field of underwater acoustic engineering and provides a multi-layer composite acoustic structure for underwater acoustics. A proposed multi-layer composite acoustic structure for underwater acoustics has the following features: a supporting frame (3) is formed by connecting longitudinal beams (6) and beams (1); the outer sides of the supporting frame (3) are provided with sound-absorbing layers (2); The central cavity of the supporting frame (3) is filled with a resonant cavity formed by a sound-insulating layer (4) and a fluid cavity (5), wherein the sound-insulating layer (4) has at least two layers; the fluid cavity (5) has at least one; The sound insulation layer (4) is filled with counterweights (7), which are used to fix the sound insulation layer (4) and play a role in adjusting buoyancy and gravity. The invention has the characteristics of convenient installation, simple structure and excellent sound-absorbing performance in a wide frequency band, and can be applied in the fields of anechoic pools, ship sonar cabins and the like.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic engineering, and in particular relates to a multilayer composite acoustic structure for underwater acoustics. Background technique [0002] So far, sound-absorbing or sound-insulating structures for underwater sound waves are usually composed of a single rubber material or polyurethane material with high loss, made into a plate or conical shape, and a cavity structure is opened inside to enhance the sound absorption capacity. After optimization and adjustment of materials and structures, this type of structure will obtain excellent sound absorption performance in a certain frequency band. However, the sound absorption frequency band of this type of structure is narrow, and the thickness or length of the structure must be long enough to obtain broadband sound absorption effect. Moreover, its functionality is relatively single, and usually it can only absorb sound but not reflect sound ...

AI Technical Summary

Problems solved by technology

However, the sound absorption frequency band of this type of structure is narrow. If you want to obtain broadband sound absorption effect, the thickness or length of the structure must be long enough.

Moreover, its functionality is relatively single, usually it can only absorb sound but not reflect sound or isolate sound, and there is a phenomenon of sound leakage.

In addition, most of the underwater acoustic materials are installed on the surface of the rigid structure with adhesives or coating methods, the construction process is complicated and the construction time is long

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