Hydroacoustic multi-layer composite acoustic structure

Abstract

The invention belongs to the technical field of hydroacoustic engineering, and provides a hydroacoustic multi-layer composite acoustic structure. The hydroacoustic multi-layer composite acoustic structure is provided with a support skeleton (3), the support skeleton (3) is formed by connecting longitudinal beams (5) and transverse beams (1), sound absorbing layers (2) are arranged at the outer side of the support skeleton (3), a resonance cavity which consists of at least two sound isolation layers (4) and at least one fluid cavity (5) is filled in a center cavity of the support skeleton (3), and a counterweight (7) is filled in each sound isolation layer (4) and is used for fixing the corresponding sound isolation layer (4), and performing the buoyancy and gravity adjusting function. The hydroacoustic multi-layer composite acoustic structure has the advantages that the installation is convenient, the structure type is simple, the sound absorbing property at the wide band is excellent, and the hydroacoustic multi-layer composite acoustic structure can be applied to the fields of anechoic tanks, 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

Images