Target sound scattering stealth covering layer based on symmetrical medium surface and implementation method of target sound scattering stealth covering layer

Abstract

The invention discloses a target sound scattering stealth covering layer based on a symmetrical medium surface and an implementation method thereof. The covering layer covers the surface of a to-be-hidden target and is formed by splicing a plurality of first medium plates and a plurality of second medium plates in a staggered mode. The acoustic impedance r1 of the first medium and the acoustic impedance r2 of the second medium meet the condition: r1r2 = r2; wherein r is acoustic impedance of a space medium where the target is located. The target sound scattering stealth covering layer provided by the invention has no special requirements on the appearance of a covering layer medium, has wide requirements on medium parameters, has the advantages of simple structure, convenience in acoustic material selection and no limitation by an incident sound azimuth angle and working frequency, and can realize sound scattering stealth of a target in a far-field area.

Description

technical field [0001] The invention belongs to the technical field of target acoustic scattering stealth, and in particular relates to a target acoustic scattering stealth covering layer based on an acoustic impedance symmetric medium. Background technique [0002] The conventional acoustic stealth technology is to lay a sound-absorbing covering on the target to be invisible to absorb the detection sound waves of active sonar, thereby reducing the probability of being detected. At present, sound-absorbing cavities or sound-absorbing wedges are usually used to achieve sound absorption. The sound-absorbing cavity is to change the propagation path of the sound wave in the covering layer through the cavity structure, so that the sound energy can be absorbed more; for example, the Chinese patent document with the application number 201810263745.5 discloses a combined cavity based on the impedance gradient type Type acoustic cladding, which uses a multi-layer composite cavity to...

AI Technical Summary

Problems solved by technology

With the development of acoustic detection and perception technology to low-frequency, multi-base, omni-directional and multi-directional detection, the traditional acoustic stealth technology based on sound-absorbing cavity and sound-absorbing wedge will be affected by the incident angle of the sound source and the working frequency, and cannot achieve broadband. Acoustic absorption, thus facing more and more serious challenges

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