Coupling resonance type underwater acoustic covering layer with functional gradient plate

Abstract

The invention provides a coupling resonance type underwater acoustic covering layer with a functional gradient plate. The coupling resonance type underwater acoustic covering layer comprises an outercovering layer, an inner covering layer and a functional gradient plate body, the outer covering layer and the inner covering layer are laid on the two sides of the functional gradient plate body, periodic cavities are formed in the outer covering layer and the inner covering layer, and the outer covering layer cavities and the inner covering layer cavities are in one-to-one correspondence in position and different in shape. The outer covering layer and the inner covering layer are laid on the two sides of the functionally gradient plate, the sound absorption performance of the acoustic covering layer in the low-frequency range is improved through coupling of the outer covering layer, the inner covering layer and the functionally gradient plate in this way, and the sound absorption frequency range of the covering layer is effectively widened. And the influence of the dynamic behavior of the functionally gradient plate on the sound absorption characteristic of the covering layer plays aleading role. Due to the resonance effect of the functionally gradient plate, coupled resonance can be generated between the cavity and the functionally gradient plate in a low-frequency range, a strong absorption effect can be generated on low-frequency sound waves, meanwhile, the resonance effect of the acoustic covering layer at a specific frequency is enhanced, and energy dissipation of the sound waves is enhanced.

Description

technical field [0001] The invention relates to a vibration and noise reduction material, in particular to an acoustic covering layer structure applied on the surface of an underwater vehicle. Background technique [0002] In recent years, the study of the acoustic characteristics of the acoustic covering has become a hot research field. With the development and progress of sonar detection technology, the acoustic covering is developing towards the research direction of low-frequency and broadband sound absorption to meet the needs of underwater vehicles. Acoustic technology needs. [0003] With the introduction of the concept of acoustic metamaterials, due to their unique physical properties, acoustic metamaterials have been widely used in the field of vibration reduction and noise reduction, but their application research in the direction of underwater absorption and sound insulation is relatively rare. It can be seen from the published literature that traditional acousti...

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Problems solved by technology

[0003]With the introduction of the concept of acoustic metamaterials, due to their unique physical properties, acoustic metamaterials have been widely used in the field of vibration and noise reduction, but their The application research in the direction of underwater absorption and sound insulation is relatively rare

It can be seen from the published literature that traditional acoustic metamaterials do have good sound absorption performance, but their sound absorption frequency range is narrow, only around the resonance frequency, which is difficult to meet the acoustic technical requirements of underwater vehicles

[0004] In summary, traditional acoustic materials have limited their application in underwater sound absorption due to their narrow sound absorption band. It is very necessary to improve the shortcomings of traditional acoustic metamaterials by combining cavity-coupled resonant underwater acoustic cladding with functionally graded plates. However, no relevant research work has been found in domestic and foreign literature.

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