Perforated plate structure based on Helmholtz and acoustic black holes

By introducing Helmholtz resonance structure and acoustic black hole structure into the perforated plate structure, and superimposing the Helmholtz resonance effect and acoustic black hole effect, the problem of narrow sound absorption band of the traditional perforated plate sound absorption structure is solved, and effective absorption of sound waves of different frequencies is achieved.

CN120164436APending Publication Date: 2025-06-17HENAN UNIV OF SCI & TECH
0 Cites 2 Cited by

Patent Information

Application Number
CN202510340918.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-21
Publication Date
2025-06-17

AI Technical Summary

Technical Problem

The sound absorption performance of the traditional perforated plate sound absorption structure is limited by its structural size, mainly absorbing sound waves near the resonant frequency, resulting in a narrow sound absorption band and poor sound absorption effect in the low frequency range.

Method used

A perforated plate structure based on Helmholtz and acoustic black holes is designed. By introducing the Helmholtz resonance structure in the center of the acoustic black hole, superimposing the Helmholtz resonance effect and the acoustic black hole effect, the absorption capacity of sound waves is enhanced and the sound absorption frequency band is broadened.

Benefits of technology

Effective absorption of sound waves of different frequencies is achieved, the sound absorption band is widened, the sound absorption performance is significantly improved, and the energy absorption efficiency of the perforated plate structure is improved.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a perforated plate structure based on Helmholtz and acoustic black holes, which comprises a perforated plate and a bottom rigid wall which are distributed in parallel, and the perforated plate, the bottom rigid wall and an outer side rigid wall are closed to form a resonant cavity; the bottom rigid wall is provided with a plurality of partition plates distributed in a latticed mode, the resonant cavity is divided into a plurality of sub resonant cavities, the perforated plate is provided with a plurality of acoustic black hole structures, and one acoustic black hole structure is arranged in each sub resonant cavity. A round hole is formed in the perforated plate at the central position of the acoustic black hole structure, and the round hole is used as a neck part of the Helmholtz resonance structure; a gap neck exists between the partition plate and the perforated plate, and an acoustic black hole molded line II is arranged on the partition plate. The perforated plate structure can increase the absorption efficiency of sound waves with specific frequency, dissipation is carried out through the damping sound absorption material, an energy absorption-energy consumption trap is formed, the vibration and noise reduction effect is achieved, and meanwhile the sound waves entering the resonant cavity are dissipated again through the gap type Helmholtz resonance structure between the partition plate and the perforated plate.
Need to check novelty before this filing date? Find Prior Art