Design and preparation method of acoustic black hole dynamic vibration absorber with variable density power law

Abstract

The invention discloses a design and preparation method of an acoustic black hole dynamic vibration absorber with a variable density power law, and designs and prepares a density power law acoustic black hole with a depth sub-wavelength size and a dynamic vibration absorber thereof based on an acoustic black hole principle. Discrete design is adopted for a density power law acoustic black hole unit, so that the size parameters and material parameters of all parts are determined; the variable-density material required by a density power law acoustic black hole structure is prepared by taking high-density tungsten particles uniformly dispersed in a polymer as a raw material; according to size parameters and material parameters of all parts of the density power law acoustic black hole structure, a density power law acoustic black hole unit is prepared through the prepared variable density material, the acoustic black hole unit is connected with a main structure through a connector, and the density power law changing acoustic black hole dynamic vibration absorber is obtained. Compared with a traditional acoustic black hole dynamic vibration absorber with the same geometric length, the density power law acoustic black hole dynamic vibration absorber can achieve low-frequency ultra-wideband damping enhancement and dynamic vibration absorption.

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